48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 34 Pedicle valve moderately convex in lateral profile and with the

greatest convexity located in the

umbonal

region; beak strongly in- curved;

umbonal

region narrowly swollen

and marked

off

from main body

of valve

by

steep slopes; sulcus shallow, equal inwidth to about one-quarter the valve width orless, originating about

4 mm.

^anterior

to the curved

umbo

; areas

bounding

^sulcus moderately swollen slopes to margins steepening posteriorly

and

steepest alongthe

umbo

cardinal extremities flattened.

Brachial valve nearly flatin profile, but strongly geniculated

around

the

margin;

point of geniculation 15

mm.

anterior to beak;

umbonal

region concave; fold low, widening anteriorly

and

originating about 5

mm.

anteriortothe beak.

Grooves bounding

sulcus shallow, deepest near the middle; flanks slightly swollen.

Measurements

in

mm. — ^Holotype

^{(pedicle valve), length 17.6,}

width (based

on

half

measure)

24, height _6.5; paratype,

U.S.N.M.

125462a

(brachial valve), length 16.1, hinge width 17.1 ^;

midwidth

23.6.

Types.

—

^Holotype,

^U.S.N.M.

125353^; figured paratypes,

U.S.N.M.

125352a, 125354; unfigured ^paratypes,

U.S.N.M.

125352b, I25462a,b.

Localities.

—

636;

F; P12

^; S46,

S103; U.O.

^2205-1.

Discussion.

—

^{This species is} characterized

by

^{its small size, the} geniculated anterior

margin

of the brachial valve

and

the very fine spines.

The

largest specimen

from Oregon

is about the

same

sizeas the type specimen of

W.

montpelierensis figured

by

Girty (1910), but the

Oregon

species is

more

deeply sulcate

on

the pedicle valve

and

has a

somewhat more

prominently folded brachial valve

and

finer spines. Girty's illustrations

do

not indicate the strong genicula- tion of the anterior

margin

of

W.

montpelierensis that ^is such a prominentcharacterofthe

Oregon

species. If this

were

presentinthe Idaho form, a fairlydeep trough

would

appearparallel tothemargin.

ECHINOCONCHUS INEXPECTATTJS

^Cooper,

^new

^species

Plate 8C, figures 13-26

Shell small to

medium

^size for the genus,

somewhat

trapezoidal to pentagonal in outline; sides broadly rounded; greatest width located at about two-thirds the length

from

the

umbo. Hinge narrower

than the shell at its widest part, equal to about two-thirds the width.

Anterolateral extremities narrowly rounded; front

margin

gently rounded. Surface of both valves

marked by

conspicuous concentric

growth

^lamellae bearing

rows

of spines of

more

than one size.

Pedicle valve strongly

convex

in lateral profile with the beak

and

umbo

curved over the hinge line; beak curved over

and

^{pointing at}

NO. 12

PERMIAN BRACHIOPODS FROM OREGON — COOPER 49

the dorsal

umbo. Umbonal

region narrowly

convex and

with steep, almost vertical slopes to the cardinal extremities.

Median

region

somewhat

inflated; lateral slopes

and

anterior slope very steepto the margins. Cardinal extremities auriculate, ears small,

forming

_{an ob-} tuse angle

(n8°). Median

portion of valve slightly depressed

by an

almost imperceptible sulcus

which may

or

may

notreach the anterior margin.

Brachial valve trapezoidal in outline, moderately concave with the deepest part located just anterior tothe

umbo.

In front of this deep part a barely perceptible fold extends anteriorly tothe front margin.

Areas

extending obliquely to anterolateral extremities

and bounding

the fold moderately deep. Cardinal extremities deflected in a dorsal direction, flattened; marginal parts of valve

forming

awell

bounding

the concave portion.

Measurements

in

mm. —

^{Holotype, length} 27.8, width 30.4, thick- ness at middle 12.2,height _15.7,length of brachial valve21.8, surface

measure

_50; paratype,

U.S.N.M.

_125357, length _25, width _25.5, thickness at middle 9, height 12.8, length of brachial valve 20.9;

paratype,

U.S.N.M.

_125358, length _22.5,

width

_23.9, thickness at middle 8.8, height 11.3, surface length _36, length of brachial valve 18.7; paratype,

U.S.N.M.

₁₂₅₄₅₄ (brachial valve), length _21.2, mid-

width

32.2,hinge width 20.7, surface length _37.

Types.—

Holotype,

U.S.N.M.

₁₂₅₅₅₁;figuredparatypes,

U.S.N.M.

125356, 125357, 125359, 125454; unfigured paratype,

U.S.N.M.

125358.

Localities.

—

636, 638, 639;

F;

Pio,

Pn

; S25, S29, S39, S40, S45, S46, S47, S50, S70,

S87; U.O.

2201, 2201-1,2202, 2204-1, 2204-3.

Discussion.

—

^{This speciesis}

^most

suggestive of

Echinoconchus

fas- ciatus

(Kutorga)

of described

European Permian

species. It differs,

however, in having different dimensions, the

Oregon

species being shorter

and

wider with a broaderanterior

and more

flaring sides.

Echinoconchus

inexpectatus,

new

species, is a fairly

common

spe- cies in the

Oregon Permian and

is usually

found

in dense, hard, brownish-graylimestonehaving a very fine grain.

Suborder RHYNCHONELLOIDEA Moore,

1952 Superfamily

Rhynchonellacea

Schuchert, 1896 Family

CAMAROTOECHIIDAE

Schuchert and LeVene, ₁₉₂₉

WELLERELLA MULTIPLICATA

^Cooper,

new

species Plate 10B, figures 7-1

1

Shell of about

medium

^size for the genus, subtriangular inoutline

;

wider than long

and

withthe greatestwidthataboutthemiddle; sides

rounded

; front

margin

truncated, posterolateral

margins forming an

obtuseangle; paucicostate, having ₅ costae

on

the fold of the brachial valve

and 4

^{costae in the sulcus} of the pedicle valve,

and

the flanks with

4

^costae.

Pediclevalve gently

convex

in lateralprofile, nearly flat in anterior profile; beak small, incurved;

umbo

gently swollen; sulcus originating just anteriorto themiddle

and

occupied by 4^{costae; costae}extending posteriorly for a short distance onto the

umbo. Tongue

long, genic- ulated at right angles, truncated anteriorly; flanks

bounding

sulcus not strongly elevated, flattened.

Brachial valve moderately

convex

^{in lateral profile} but strongly

convex

inanteriorprofile;

umbo smooth and

swollen; fold originating at about the valve middle, nearly flat in anterior profile

and

only moderately elevated; flanks gently

rounded

but sloping steeply to the margins.

Measurements

in

mm. —

^{Holotype, length 10.5,brachial} valve length 9.5,

maximum

width 12.0,thickness 7.8; paratype,

U.S.N. M.

125467b, length 9.8, brachial valve length 8.9,

maximum

width 10.7, thick- ness 9.1.

Types.

—

^Holotype,

^U.S.N.M.

^{125467a; unfigured but}

^measured

paratype,

U.S.N.M.

125467b.

Locality.

—

S87.

Discussion.

—

^{This species is} characterized by its globular form, its

low

^fold,

and

the presence of 4costae in the sulcus

and

5

on

the fold.

This species has an exterior resemblance to

W.

pinguis (Girty)

and

W

^.

shumardiana

(Girty) but it differs

from

both of

them

in being

much

^smaller

and

in having

more

costaein thesulcus

and on

the fold.

Allorhynchus?

permianus

Stehli has a fold

and

sulcus with a similar

number

of costae but this species is costate over the

umbones

as well as

on

the anterior half. Furthermore, Stehli's species has

more

costae

on

the flanks than the

Oregon

species.

No

other described Wellerella is close to this one.

Superfamily

Stenoscismatacea Shrock and

Twenhofel, 1953 Family

STENOSCISMATIDAE

Muir Wood, 1955

STENOSCISMA MUTABILE OREGONENSE

Cooper,

new

subspecies Plate 9C, figures 15-28

Shell of about

medium

^size for the genus,

body

^{slightlywider than} long,

somewhat

triangular in outline with beak

and

sides forming an angle of about

90

°_; greatest width anterior to the middle; postero- lateral margins narrowly rounded; front

margin

nearly straight.