RATHBUN— MARINE BRACHYURA 197 



Dorippidae. 



11. Dorippe dorsipes (Linnaeus). 

 Dorippe dorsipes Alcock (2), p. 277. 



Cargados Carajos, 30 fms., Sta, B 15 ; 1 $: 29 — 30 fms., Sta. B 7 ; 1 <?juv. 



Calappidse. 



12. Calappa calappa (Linnaeus). 

 Calappa fornicata Alcock (2), p. 142. 

 Praslin, reef; 1 young ?, 33 mm. long. 



In specimens of this size the anterior half of the carapace is covered with flattened 

 tubercles. 



13. Calappa hepatica (Linnaeus). 

 Calappa hepatica Alcock (2), p. 142. 



Farquhar, atoll lagoon; 3 $ small. Seychelles, 31 fms., Sta. F 2; I $ small. 



14. Calappa gallus (Herbst). 



Calappa gallus Alcock (2), p. 146 ; Laurie, in Herdman, Ceylon Pearl Fisheries, 

 pt. V, Suppl. Rept. xl. Brachyura, 1906, p. 354. 



Salomon ; 1 $, of the (A) type described by Laurie. 



15. Calappa bicornis Miers (Plate 17, fig- 8). 



Calappa gallus var. bicornis Miers, Rept. Zool. Coll. "Alert," Crust., 1884, p. 550, 

 Providence Island, 19 fms. 



Calappa wood-masoni Alcock (2), p. 148, pi. 6, fig. 2, south of Ceylon, 34 fms.; 

 Illus. Investigator, Crust., pt. v, 1897, pi. 28, figs. 2, 2 a. 



Seychelles, 34 fms.; Sta. F 8 ; 2 g (1 adult, 1 juv.). 



Dimensions. — $, C. 1. extreme 41*8 mm., C. b. just before the expansion 41 - 4 mm., 

 C. b. extreme 50"5 mm. 



The adult has the same form as C. gallus, from which species it is probably derived. 

 Compared with a male gallus of equal size, extreme length greater than width at sinus in 

 front of clypeiform expansion ; in gallus, length distinctly less than width. Tubercles of 

 carapace and chelipeds high and conical. Clypeiform expansions narrower and their 

 posterior teeth shorter (along their posterior margins). Hepatic cavity shallower. Front 

 deeply divided, the median sinus reaching back to level of lateral teeth of the front. 

 Antennae f- as long as carapace. Upper and lower margins of orbit denticulate. The 

 sixth segment of the abdomen is as wide at its distal as at its proximal end, which is not 

 the case in gallus, and the terminal segment is considerably longer than in that species, 

 being 1§ times longer than the sixth segment. In both species the sixth segment is 

 the longest of the seven, the last segment excepted. I think that the abdomen described 

 and figured by Alcock is that of a young ? rather than $. 



A young male 15 mm. long is more quadrangular than the adult, and its tubercles 

 sharper ; antenna | as long as carapace. 



