235 

 I. Camatopsis rubida Alcock. PI. i6, Fig. 3. 



1899. Camatopsis rubida Alcock et Anderson. Ann. Mag. Nat. Hist. (7), v. 3, p. 13. 



1899. Camatopsis rubida] A\coc\i. Deep Sea Brachyura "Investigator", p. 76, pi. 4, f. 3. 



1900. Camatopsis rubida Alcock. Journ. As. Soc. Bengal, v. 69, prt 2, p. 329. 



1904. Camatopsis ricbida Doflein. Wiss. Erg. "Valdivia" Exp., Bd 6, Brachyura, p. 121. 

 1910. Camatopsis rubida Rathbun. K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n'^ 4, p. 344. 



Stat. 5. 7°46'S., ii4°3o'.5 E. Near north-east point of Java. Depth 330 m. i cf , i 9 (ovig.). 



Stat. 114. Kwandang Bay [entrance. Depth 75 m. 2 cf, i 9 (all juv.). 



Stat. 116. West of Kwandang Bay entrance. Depth 72 m. 3 (^ (juv.). 



Stat. 254. 5°4o'S., 132° 26' E. W. of Kei Islands. Depth 310 m. i 9. 



Stat. 260. N. W. of Kei Islands. Depth 90 m. 3 cf (juv.). 



Stat. 302. io°27'.9S., I23°28'.7E. Near Rotti. Depth 216 in. i cf (juv). 



Stat. 306. 8°27'S., 122° 54'. s E. South of Flores. Depth 247 m. 2 cf (juv.), i 9. 



Stat. 312. Saleh Bay, north coast of Sumbawa. Depth 274 m. 2 cT' (r juv.). 



The various specimens present such rather important difterences one from another, that 

 at first sight I was inclined to regard them as two distinct species; on close examination, 

 however, I have come to the conclusion, that all the specimens belong to the same species. 

 For the sake of convenience I shall discriminate the two forms under the names A and B, 

 beginning with A. 



All but one of the specimens "forma A" are adult (breadth of carapace more than 

 6.5 mm.), and all occur in deep water. The carapace is little broader than long, covered with 

 very minute granules on the anterior parts and along the postero-lateral margins, but to a 

 greater or lesser extent covered with a short pubescence, leaving the central parts free. In 

 some specimens there is no trace of grooves on the carapace (fig. 2), but in others two irregular 

 depressions mark the presence of branchio-cardiac grooves. The curvature of the surface is little 

 pronounced, and the front is only feebly deflexed, but it presents a somewhat different shape 

 in various individuals, even of appro.Kimately the same size. So in the two specimens of Stat. 5 

 (fig. 3) and in that of Stat. 254 the anterior margin of the front is perfectly straight, 

 about as long as the eye-peduncle, whereas in others (Stat. 306, 312, fig. 3 «) it is strongly 

 bilobed, more roof-like and prominent over the bases of the antennules; it is this latter case, 

 which is figured by Alcock. The eye-stalks are thick and short, for the greater jjart concealed 

 in dorsal view, and on the ventral side a very minute speck of pigment may be visible, but 

 is mostly absent. The antero-lateral margins of the carapace are much convex, sharpened, 

 granulate, the postero-lateral ones straight, obtuse, divergent backward. The posterior margin 

 is strongly sinuous, straight in the middle, where the narrow abdomen is attached. 



Epistome present, but sunken, and ill-defined posteriorly. Basal joint of antennulae not 

 inflated, completely filling up the small fossa, the two next joints of peduncle narrow, cylin- 

 drical, the terminal one the longer (fig. 3«). Antennae weak, the two last joints of the peduncle 

 free, flagellum consisting of a few joints. Lateral margins of buccal cavity subparallel. External 

 maxillipeds widely gaping, ischium only very little longer than merus (fig. 3^), the latter broader 

 than ischium, subcircular, strongly bulging outward; palp very long and thick, with the 

 terminal joint half as long as the preceding. 



Chelipeds long and slender, longer than the carapace, and of unequal build. Meropodite 



87 



