402 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



In the absence of long series showing growth changes, the writer prefers 

 to refer all Hancock-collected Stenocionops from the Galapagos Islands 

 to S. triangulata, while calling attention to this discrepancy. 



Stenocionops ovata (Bell) 



Pericera ovata Bell, Proc. Zool. Soc. London, vol. 3, p. 173, 1835 ; Trans. 



Zool. Soc, London, vol. 2, p. 60, pi. 12, figs. 5, 5o-q, 1836. 

 Stenocionops ovata Rathbun, Proc. U.S. Nat. Mus., vol. 38, p. 574, 

 1910; Bull. 129, U.S. Nat. Mus., p. 459, pi. 264, f^gs. 5-7, 1925. 



Type locality. — Galapagos Islands. 



Type. — Not extant. 



Range. — Known only from the Galapagos Islands (Bell). 



Diagnosis. — Eight median spines and a hepatic spine; 4 or 5 marginal 

 spines. Rostrum one-fifth carapace length, horns strongly divergent. 

 (From Bell's description.) 



Material exa?nined. — None, unless the Wenman Island specimen 

 mentioned above should prove to be of this species. 



Remarks. — See Remarks under the preceding S. triangulata. 



Genus MIGROPHRYS Milne Edwards, 1851 

 Key to the Galapagos Species of the Genus Microphrys 



A^ No flattened, imbricated lobes on the lateral margins of the cara- 

 pace M. triangulatus 



A^ Two flattened, imbricated lobes on the lateral margins of the 

 carapace 

 B^ Carapace considerably longer than broad ; 2 spines at widest 



part of branchial region M. platysoma 



B^ Carapace little longer than broad, hairy; 4 spines on each 



branchial region M. aculeatus 



Microphrys aculeatus (Bell) 

 Plate 63, Fig. 5 



Fisa aculeata Bell, Proc. Zool. Soc. London, vol. 3, p. 171, 1835 (1836) ; 



Trans. Zool. Soc. London, vol. 2, p. 50, pi. 9, fig. 7, 1836. 

 Microphrys aculeatus A. Milne Edwards, Crust. Reg. Mex., p. 63, 1875. 



Rathbun, Bull. 129, U.S. Nat. Mus., p. 500, pi. 271, fig. 1, and 



synonymy, 1925. Boone, Zoologica, vol. 8, no. 4, p. 169, fig. 55, 1927. 



Sivertsen, Med. fra det Zool. Mus., Oslo, nr. 38, p. 13, 1933. 



