A white knob on the dorsal distal margin of the manus is evident against the orange surface of the cheliped. Spotted bands on meri of chelipeds and ambulatory legs are suggested. The corneas on the fingers of chelipeds and ambulatory legs are dark brown to black.
There are large green areas on the central front third of the shield, on. There is only one row of corneal granules on the inner surface of the finger tip of the cheliped of C. The black corneal tips on the fingers of the cheliped are not as extensive in C.
There are four extremely small, poorly developed pleopods on the right side of the abdomen. The spine on the anterior margin of the sixth abdominal tergite is very similar to that in C.
Cancellus canaliculatus (Herbst, 1804)
Commentary Na accompanied the synonymy of Whitelegge (1889a) and since then there has been little question about the name of the Australian species. Zietz (1888), also, noted a "shovel-shaped extension" on the basal article or coxa of the fourth pair of ambulatory limbs. The frontal edge of the carapace on either side of the rostrum appears to be deeper than in Zietz' (1888) or Hale's (1941) drawing of the anterior end.
Some of the characteristics shared by these species are the general shape and lobation of the chelipeds and ambulatory legs and the smooth anterior margin of the sixth abdominal tergite. However, these two are easily distinguished by the expanded fifth coxal segments of the male, the lobular telson, and the hairy surfaces of the tail fan of C. This character is especially noticeable on the inner surface of the dactylus of P3, on the abdomen, and on all parts of the tail fan.
All previously reported females had pleopods on the left side; one of the two females examined here had them on the right. Among the observed differences between the examined males and females were the enlargement of the coxal segments of the male and the bifid nature of the ocular scales in the female (this scale has a simple, triangular projection in the male). NOTES.—The holotype was dried and mounted on paper; many appendages were disarticulated and improperly positioned on the specimen.
Although the last pereiopods, P5, were missing entirely, the holotype was male, as determined by the absence of gonopores on the coxae of P3. In addition to describing the general shape of the appendages, Herbst said the arms were concave with serrated edges, and the second and third segments on the first pair of legs were concave. One small drawing of a crab shows a posteriorly narrowed abdomen with multiple constrictions and dark lines marking at least five segments.
Benedict (1901) commented on this departure from the usual spherical shape of the abdomen: "The abdomen in this genus appears to be even more easily separated from the thorax than in other genera, and this separation had not improbably occurred in Herbst's specimen, and the conventional form may have been added to the figure for for the sake of completeness." He added that Herbst had substituted an incorrect part in another known work. The toothed projections and the small distal lobe on the dorsolateral margin of the manus are not found in any other species. Furthermore, an interrupted frontal border and transverse sculpturing rather than tubercles on the carapace do not occur together in any other species except C.
Cancellus investigatoris Alcock, 1905
This supports Benedict's (1901) suggestion that Herbst (1804) had added a typical pagurid belly to his illustration, as the belly was missing from the type specimen. The color was described as white with red spots, with the red color forming a band on the legs. Similar sculpture anterolaterally; central gastric region relatively smooth, with several punctae at the base of small groups of setae.
Two broad transverse spots with long hairs on the anterior edge of the plate; several groups of brushes longitudinally along the lateral edges. Dorsolateral margin of the carpus slightly raised, divided into 4 or 5 lobes, serrated on the dorsal margin with tufts of hairs; several fissures dividing the inner margin into groups of tooth-like cusps. The dorsolateral edge of the propodus expanded, divided into five well-separated lobes: occasionally one subdivided to form more lobes; dense hairs on the outer comb and anterior edge of the lobes; inner margin with 6 or 7 tufts of setae ventrally; 3 or 4 small teeth on the distal edge of the lateral surface.
Dorsal margin of carpus P3 with 4 anterodorsal processes: distally one or two lobulate; tufts of setae and several denticles along dorsal margin. Dorsolateral margin of propodus divided into 4 or 5 lobes: distal one larger, proximal one or two smaller; lobes tuberculate with setae on dorsal margin; inner side smooth, with scattered groups of 2 or 3 bristles in rows; several teeth on distal margin. Dactylus smooth, flat, with longitudinal rows of setae groups; outer margin irregularly toothed; tufts of setae just lateral to dorsal margin; 3 to 6 pink teeth and 4 large tufts of setae on ventral margin.
Dactylus from P4 not extending to distal margin of propodus, ending in horned tooth and setae tufts; 2 or 3 proximal to this on the mesial margin. Protopod uropod smooth, groups of short bristles on surface; posterolateral projection with rounded projection mesial, very weak tooth and group of setae on posterolateral corner;. Alcock noted that there were no striae spots on the inner surface of the palm, but he did not describe, nor did his illustration show, the distinct spot on the ventrolateral surface that C.
Later (1910) Southwell described the modification of the chelipeds to form an operculum for the crab's burrow. During a survey of the pearl banks of Ceylon, this specimen was dredged up and occupied a small cavity at the ventral edge of a flat-lobed piece of Porites arenosa four inches in diameter. The end of the abdomen could protrude slightly through a very small hole located slightly closer to the basal center of the coral, and the specimen could rotate completely in its shelter.
Cancellus macrothrix Stebbing, 1924
One specimen was taken in shallow water in the Gulf of Mannar (between the west coast of Ceylon and the southern tip of India). Barnard's (Cancellns-like) description of the rostrum and frontal margin of the carapace does not agree with Stebbing's rough sketch (pi.. of carapace, redrawn in Figure 22, this paper) which is more like pagurids of other genera. Barnard (1950) described eight juveniles attached or "attached" to various parts of the abdomen and sides of the carapace of a female specimen; two were still enclosed in the egg membrane, the other six were free and said to be in the "glaucothoe stage." He concluded that in C.
Reports of dredging operations from the west coast of Central America to the Galapagos, the west coast of Mexico, and in the Gulf of California, in charge of Alexander Agassiz, conducted by the U.S. Reports of dredging results, under the supervision of Alexander Agassiz in the Gulf. Notes on the habitat of two species of Pagurids; description of one new species; and a list of anomurs recorded to date from Ceylon waters.
List of the Marine and Freshwater Invertebrate Fauna of Port Jackson and Vicinity. Manuscripts for serials are accepted by the Smithsonian Institution Press, subject to substantive review, only through departments of the various Smithsonian museums. If submission is invited, the following press format requirements will govern the preparation of copy.
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