Ogyris Stimps. 



The remarkable genus Ogyris, distinguished by its elongate and slender eye-peduncles 

 from all other Alpheidae, was hitherto represented by one indopacific and two atlantic species; 

 a fourth, O. Sibogae, has been collected by this expedition. This species with its quadriarticulate 

 carpus appears closely related to O. occidentalis from the mouth of the river Tocantins, but it 

 differs by the smaller number of teeth on the dorsal carina of the carapace and by the shape 

 of the telson. Ogyris Sibogac was collected in rather deep water off the Sulu Islands and also 

 probably inhabits the Saleh-bay, Sumbawa, though the specimen from the latter locality may 

 perhaps once prove to belong to a distinct species. O. orientalis Stimps. has been observed in 

 the China Sea and in the Bay of Kagoshima. Of the american species, one inhabits the coast 

 of Virginia, the other the mouth of the river Tocantins. 



Key to the species of the genus Ogyris. 



a x Carpus of second pair of legs triarticulate. 



è 1 Carapace smooth, without dorsal carina ; rostrum very small . . alphaerostris Kingsley 

 (J. S. KINGSLEY, in: Proc. Acad. Nat. Scienc. Philadelphia, 1879, p. 420, PI. 



XIV, Fig. 7). 



b 2 No rostrum, but the carapace with a dorsal carina armed with 4 



or 5 small teeth orientalis Stimps. 



(W. STIMPSON, in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 36). 



a„ Carpus of second pair of legs quadriarticulate. Rostrum present, small. 

 b x Dorsal carina of carapace with 7 — 9 teeth. Lateral margins of 



telson without a prominence occidentalis Ortm. 



(A. ORTMANN, in: Ergebnisse der Plankton-Exped. II, Kiel und Leipzig, 1893, 

 p. 46, Taf. III, Fig. 4). 



b„ Dorsal carina of carapace with 4 teeth. Lateral margins of telson 



with an obtuse prominence just before the middle Sibogae de Man 



f 1. Ogyris Sibogae de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 31S. 



Stat. 102. July 1. 6°4'.i N., I20°44'E. Sulu-Sea. 535 m. Fine, yellow sand. Dredge full of 



fine yellow sand; nearly no animals. 1 specimen. 

 Stat. 313. February 14/16. Anchorage East of Dangar Besar, Saleh-bay. Depth up to 36 m. 



Sand, coral and mud. 1 specimen. 



This species closely approaches to O. occidentalis Ortm. from the mouth of the river 

 Tocantins. The following description is drawn from the adult specimen collected at Stat. 102, 



3 



