The first segment of the exopodite is longer than wide, and roughly quadrangular in outline. The second segment of the exopodite is about equal to the second basal segment. The terminal hook is symmetrically curved, toothed on the inner edge and somewhat shorter than the rest of the exopodite.
The first segment of the exopodite is quadrangular, wider than long, and has a stout spine at its outer distal angle. The endopodite is composed of a single segment, approximately half as long as the first segment of the exopodite. 3 .COPEPODA FROM PANAMA MARSH 9 The spines of the first basal segments of the male fifth foot (pi.
The first segment of the exopodite is usually wider than long, and has a short cuticle ridge near its distal margin on the caudal aspect. The second segment exceeds in length the combined length of the first segment and the second basal segment, and is about twice as long as wide. The endopodite is triangular in shape, does not exceed the first segment of the exopodite in length, and has a short seta on the inner margin.
The endopodite is triangular, about as long as the first segment of the exopodite, and setose on the inner margin near the end.
NO. 3 COPEPODA FROM PANAMA MARSH II second abdominal segment is very short being only about one-fourth
3 COPEPODA FROM PANAMA MARSH II The second abdominal segment is very short, being only about a quarter. Fifth left leg of male reaches second segment of right exopodite. The second basal segment is about three-quarters the length of the corresponding segment of the right leg, is trapezoidal in shape, and bears small lateral hairs near the distal end.
The terminal segment is about two-thirds as long as the first and ends in a digital process. The endopodite is composed of one segment and is approximately equal in length to the first segment of the exopodite. This was first found in Guatemala by Juday, near Puerto Barrios and Los Amates, and was described by him in Trans.
As it is a new species of considerable interest in connection with the fauna of Panama, it has been found best to describe it in detail in this place, with figures which will show the characteristic features of the species. Cyclops Icuckarti was found generally distributed in the canal zone, as might be expected, being a cosmopolitan species. It occurred in all sanitary reservoirs and in most other freshwater bodies.
The synonymy of this species has been discussed in a previous publication (Marsh ar,d it is not necessary to enter into that subject here. This has apparently never been noted in individuals from other localities, except that it is assumed without remark by Kokubo, 1912, from material collected in Japan.
NO. 3 COPEPODA FROM PANAMA — MARSH 13
12, shows the typical form from Calabasas, in which the second set is much longer on the outside than the fourth. There does not appear to be anything in the relative length of these theta which is characteristic of one slope of the isthmus as compared with the other, for the specimens collected at Miraflores from the southern slope were of the same relative length as those collected in the Trinidad River on the northern slope . It will be noticed that the back is abnormally long in the specimen which was depicted from the Savannah.
Cyclops tenuis was found on the southern slope in Miraflores, the Cocoli Reservoir and in the savannas near Panama. On the northern slope it was found in a pond near Bohios, in Lake Gatun, Trinidad River, in a spring at Toro Point and in reservoirs on the northern slope, namely Comacho, Carabali, Mindi and Agua Clara. . Cyclops oithonoides is reported from Haiti, Richard '95, p. Since in neither of these cases are the details of the anatomy given, it seems possible that the authors had C.
Because they were dissected before measurements were taken, on the assumption that a larger number would be found, the description is incomplete as to the morphology of the cephalothorax. The receptaculum seminis, however, has a different shape, and Richard makes no mention of the peculiar structure of the maxilipede, which was so conspicuous in C. The cephalothorax is oval, and its length is about 9 to 5 cm compared to its width. the furcal rami is approximately equal to the width of the cephalothorax.
The last cephalothoracic segment is armed on each side with a prominent seta, and the edges have small spines. enlarged at its front, and somewhat exceeding in length the. The furred rami are slender and nearly equal the combined length of the two preceding segments. Of the four terminal setae, the outer and inner are weak and short, the inner being considerably shorter and smaller than the outer.
The longest terminal seta is approximately equal in length to the combined length of the last three abdominal segments and furrow. The first segments of the rami are armed with a row of fine spines on the distal margin. The membrane connecting the feet of the fourth pair is armed on each side with three blunt spines.
NO. 3 COPEPODA FROM PANAMA — MARSH 1
2, and 7, drawings of the first and second antennae and the fourth swimming legs are given. Van Douwe reports Cyclops phalcratus from Brazil, but says that the forms, though mature, had antennae of seven segments. It seems possible that further study of South and Central American material may result in the establishment of a group of Cyclops species closely related to Cyclops phalcratus.
The species is very widespread, being established as far north as Finland (Martens, 1910, no) and as far south as Algeria (Blanchard and Richard, 1891, p. 515). It occurred in a sluggish stream on the savannah near Panama and in an old well in Old Panama. As figures of the species occurring in America have not been published, it has been thought best to illustrate the typical peculiarities of the species.
GENERAL OBSERVATIONS ON THE DISTRIBUTION OF THE COPEPODA FOUND IN PANAMA
NO. 3 COPEPODA FROM PANAMA MARSH IO,
BIBLIOGRAPHY
NO. 3 COPEPODA FROM PANAMA — MARSH 21
28 SMITHSONIAN MISCELLANEOUS COLLECTION'S VOL. 61
