PART 1 GARTH : PACIFIC OXYRHYNCHA 389 



In the opinion of the writer, it is exceedingly unlikely that specimens 

 from Guadeloupe in the Paris Museum, referred by A. Milne Edwards 

 to Microphrys weddelli, are in reality the Peruvian species. If M. wed- 

 delli were a warm water species inhabiting the Bay of Panama, an 

 analogous relationship with the Caribbean form might be indicated. 

 However, M. weddelli is a cold water species, characteristic of the Hum- 

 boldt Current littoral, and effectively barred from the Bay of Panama 

 by Punta Santa Elena. Careful scrutiny of the figures of H. and A. 

 Milne Edwards, plus additional evidence from the male first pleopods, 

 may be expected to reveal morphological grounds for separating Peruvian 

 and Atlantic specimens. 



Without questioning Nobili's determination of Festa's Santa Elena 

 Bay specimen as Microphrys iveddelli, it should be stated that a young 

 Microphrys dredged by the Velero III at this locality and a 9.4 mm 

 male collected intertidally on the south side of Punta Santa Elena both 

 proved to be M. platysoma. Schmitt's Ecuadorean specimens, labeled 

 Guayaquil with a question mark, may have been taken at the mouth of 

 the Guayas River. 



Microphrys aculeatus (Bell) 

 Plate W, Fig. 4; Plate 43, Fig. 2 



Pisa aculeate Bell, 1835b, p. 171; 1836, p. 50, pi. 9, figs. 7, 7v. 

 Milnia aculeata, Stimpson, 1860b, p. 180. 



Microphrys aculeatus, A. Milne Edwards, 1875, p. 63. Miers, 1886, 

 p. 83. Nobili, 1901, p. 30. Rathbun, 1910, pp. 536, 574, pi. 45, 

 fig. 4; 1925, p. 500, pi. 271, fig. 1, text-fig. 142. Boone, 1927, 

 p. 169, fig. 55. Sivertsen, 1933, p. 13. Garth, 1946, p. 402, pi. 63, 

 fig. 5. 

 Microphrys platysoma, Rathbun, 1902b, p. 285 (part: Galapagos speci- 

 mens) ; 1910, pp. 535, 574 (part: Peruvian and Galapagan records; 

 not pi. 50, fig. 3). (Not M. platysoma (Stimpson).) 

 Type: Male and female, cotypes; length of measured cotype 16.9 

 mm, width 14.8 mm; originally deposited in the Museum of the Zoologi- 

 cal Society [London] and the Bell Museum, no longer extant. 



Type locality: Galapagos Islands, 7 fathoms; Hugh Cuming, col- 

 lector. 



Localities subsequently reported, with collectors: Ecuador: Santa 

 Elena Bay, E. Festa (Nobili). Peru: Lobos de Afuera Islands and 

 north end of Ferrol Bay (Chimbote), R. E. Coker (Rathbun, 1910, at 

 the latter locality as Microphrys platysoma). Galapagos Islands: Ecua- 



