386 PERCY SLADEN TRUST EXPEDITION 



3. CoralUocaris (Onycocaris) tridentata (Miers), 1884. 



Coralliocaris (?) tridentata, Miers, "Alert" Crust, p. 294. PL 32, fig. c. (1884). 

 Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 386 (1898). 



Coralliocaris {Onycocaris) '{ tridentata, Nobili, Ann. Sci. Nat. (9), iv. p. 60 (1906). 

 Thursday I. 



Genus CouTiEREA Nobili, 1902. 



Bull. Mus. Torino, xvi. 415, p. 4. 



Definition : Body fairly slender, somewhat depressed, with regions of carapace well 

 marked ; abdominal pleura ridged and armed each with a spine, and sixth abdominal 

 segment rather longer than the rest ; antennal and supraorbital spines very large, hepatic 

 and pterygostomian spines well developed ; rostrum long and narrow, but shallow and 

 simple ; outer antennular flagellum not deeply cleft ; antennal scale of a good breadth ; 

 mandible without palp (?) j second maxilliped with last joint mediad of preceding joint 

 and projecting but little behind it ; third maxilliped narrower than in most Coralliocaris ; 

 legs rather stout, those of second pair unequal but similar, with regularly ovoid palm 

 and long fingers, those of last three pairs with simple, moderately curved dactyles, 

 bearing basal protuberance. 



Type: Coutierea agassizi (Coutiere), 1901. 



Coralliocaris agassizi, Coutiere, Bull. Mus. Paris, vii. p. 115 (1901). 

 Coutierea agassizi, Nobili, Boll. Mus. Torino, xvi. 415, p. 4 (1902). 

 Barbados, deep water. 



Genus Stegopontonia Nobili, 1906. 



Bull. Mus. Paris, xii. p. 258; Mem. Ac. Sci. Torino (2), Ivii. p. 360 (1907). 



Definition : Body fairly slender, a little depressed, with short carapace ; which bears 

 only a small antennal spine ; rostrum toothless, broad, depressed, lanceolate in dorsal 

 view ; outer antennular flagellum not deeply cleft ; antennal scale rather narrow, with 

 long distal spine ; mandible without palp ; second maxilliped with last joint mediad 

 of preceding joint ; third maxilliped broad (?) ; legs rather stout, those of second pair 

 unequal and unlike, the smaller of Palaemonid form, the larger with elongate, swollen 

 palm and short fingers, those of last thi-ee pairs with short, deep, curved dactylopodites, 

 bearing a pair of basal prominences. 



Type : Stegopontonia commensalis Nobili, 1906. 



Bull. Mus. Paris, xii. p. 258 ; Mem. Ac. Sci. Torino (2), Ivii. p. 360, PL 1, fig. 2 

 (1907). 



Hao I., Polynesia, on Echinothrix turcarum. 



