PART 1 GARTH! PACIFIC OXYRHYNCHA 391 



not previously recorded from Post Office Bay, Charles Island, 4 fathoms, 

 February 6, 1933, Velero III station 57-33. 



Measurements: Largest specimen, male: length 27.8 mm, width in- 

 cluding spines 27.5 mm, width without spines 22.8 mm, rostrum 7.3 

 mm, width 4.0 mm, cheliped 32.5 mm, chela 16.6 mm, dactyl 7.8 mm, 

 height of palm 5.4 mm, ambulatory legs ca. 26.5, 21, 18, and 15.5 mm, 

 respectively. Female specimen: length 18.4 mm, width including spines 

 15.8 mm, width without spines 14.3 mm. 



Color in life: Not available. Color of preserved specimens fuscous. 

 (Bell) 



Habitat: Sandy mud. (Bell) Rocky bottom, along shore covered 

 with seaweed. (Rathbun, 1910) Rocky shore. (Garth) Peruvian speci- 

 mens were sponge covered. 



Depth: Intertidal; to 2.5 fathoms (Boone), 7 fathoms (Bell), 25 

 fathoms (Garth). 



Size and sex: Males in the present series are from 13.1 to 27.8 mm, 

 females from 11.2 to 18.4 mm, ovigerous females from 14.2 to 18.4 mm. 



Breeding: Ovigerous females were found in Peru by R. E. Coker 

 in March (Rathbun, 1925) and by the Velero HI in January and Feb- 

 ruary. Females with ova were taken in the Galapagos Islands by A. Wol- 

 lebaek in September (Sivertsen) and by the Velero HI in January and 

 February. 



Remarks: Judging from the fact that all Microphrys collected in 

 Peru by Hancock expeditions were from a single locality, Lobos de 

 Afuera Island, and of a single species, M. aculeatus, while all obtained 

 by W. L. Schmitt were from Paita and vicinity and were M. weddelli, 

 it would appear that the Peruvian littoral may be dotted with isolated 

 colonies of the two species, separated perhaps by differing ecological re- 

 quirements. 



Microphrys aculeatus is a species having a long rostrum, a long 

 antennal spine, and relatively few tubercles on the carapace. As com- 

 pared to M. weddelli, a species without lateral lobes, M. aculeatus bears 

 three crests instead of three spines on the merus of the cheliped. The 

 palms of the adult male are more compressed, and the tooth in the gape 

 is less prominent. As compared to M. plat y soma, the other species with 

 lobes on the side of the carapace, it is a hairy species, the hairs being 

 particularly noticeable where they arise as tufts from a row of granules 

 running transversely across the posterior portion of the carapace. The 

 hepatic and branchial lobes are smooth and polished and have no tendency 

 to become rimmed. Unlike M. platysoma, the anterior branchial spine 



