16 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



neither. Of females, 92 per cent had pubescence on both chelipeds, 4 per 

 cent on one, and 4 per cent on neither. This bears out the opinion of 

 Schmitt (1924a) that the possession of pubescence on the hand of both 

 chelipeds is predominantly a female character in this species. 



Pisosoma jugosum (Streets), n. comb. 



PetroHsthes jugosus Streets, 1872, p. 134 (type locality. Saint Martin 

 Island). Kingsley, 1880, p. 405. Benedict, 1901, p. 134. Schmitt, 

 1924a, p. 74; 1924b, p. 88; 1935, pp. 185, 186; 1936, p. 374. 

 PetroHsthes {Pisisoma) jugosus Ortmann, 1897, p. 295. 



Previous records. — 

 Florida, Charlotte Harbor: (Schmitt, 1935) ; Key West: H. E. Web- 

 ster (Kingsley). Puerto Rico, Caballo Blanco and Ponce: Fish Hawk 

 (Benedict) ; Guayanilla Harbor: Sci. Surv. Porto Rico and Virgin Ids. 

 (Schmitt, 1935). St. Thomas: (Benedict). St. Martin: Van Rijgersma 

 (Streets). Barbados: Univ. Iowa Barbados- Antigua Exped. (Schmitt, 

 1924b). Curagao: C. J. van der Horst (Schmitt, 1924a). Bonaire: 

 P. Hummelinck (Schmitt, 1936). 



Material examined. — 

 A50-39. Bahia Caledonia, Panama; Apr 26, 1939; shore. l$ov. 

 A56-39. Bahia Caledonia, Panama; Apr 27, 1939; shoal. 1?. 

 A57-39. Bahia Caledonia, Panama; Apr 27, 1939; shore. Id'. 

 A46-39. Vista Alegre, Curagao; Apr 23, 1939; shore. Icf, l?ov. 

 A20-39. Isla La Tortuga, Venezuela; Apr 13, 1939; shore. Scf, 8? 



(3 ov). 

 A25-39. Isla Cubagua, Venezuela; Apr 14, 1939; shore. Icf, 2? 



(1 ov). 

 A41-39. Buccoo Reef, Tobago Island; Apr 20, 1939; shore. 2?ov. 



Measurements. — Males, 1.6 to 3.8 mm; non-ovigerous females, 1.8 

 to 3.2 mm; ovigerous females, 2.7 to 3.5 mm. 



Remarks. — Pisosoma jugosum has been found in the littoral, under 

 stones and associated with Zoanthus sociatus and corals including 

 Maeandra. 



The species is here transferred, with some hesitation, to Pisosoma 

 because it seems to conform more closely to the characters of this genus, 

 having thick, heavily channeled carpi and the front transverse when 

 viewed from above. Ortmann (1897) also placed the species in Pisosoma 

 which, however, he did not consider generically distinct from Petro- 

 Hsthes. 



