282 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



wards and Lucas and by Dana above, they do contribute materially to 

 an understanding of the present distribution. It is significant that Pisoides 

 edwardsi was not encountered north of the bays of San Juan and San 

 Nicolas, which are in the southern part of Peru, nor was it taken by 

 R. E. Coker (Rathbun, 1910), whose territory was essentially the same 

 as that covered by the Velero III. Collectors subsequent to Cuming have 

 failed to find it in the Galapagos Islands (Garth, 1946), and extensive 

 collecting in the Panama Bight since the time of A. Milne Edwards has 

 been negative as regards the species. Southern Peru, then, rather than the 

 Galapagos or Panama, should be considered as defining the northern 

 limit of range of the species. 



Genus ROCHINIA A. Milne Edwards 



Amathia Roux, 1828, p. 8 of livr. 1, and/or p. 1 of text accompanying 



pi. 3. Not p. [5] ; type: the Mediterranean A. rissoana Roux, 1828, 



by monotypy. Milne Edwards, 1834, p. 285. Not Amathia Lamou- 



roux, 1812. 



Pisa (Amathia) De Haan, 1839, pp. 78, 84. 



Rochinia A. Milne Edwards, 1875, p. 86, footnote; type: R. gracilipes 



A. Milne Edwards, by monotypy. Rathbun, 1925, p. 204. 

 Scyramathia A. Milne Edwards, 1880, p. 356; type: S. carpenteri Nor- 

 man by subsequent designation of Rathbun (1925). Alcock, 1895, p. 

 201. A. Milne Edwards and Bouvier, 1923, p. 379. 

 Anamathia Smith, 1885, p. 493; name substituted for Amathia Roux, 



preoccupied. 

 Rachinia Alcock, 1895, p. 165. 



Type: The south Atlantic Rochinia gracilipes A. Milne Edwards, 

 1875, by monotypy. 



Description: Carapace pyriform or elongate-triangular, armed either 

 with tubercles or with long spines. Hepatic and branchial spines always 

 prominent and very conspicuous. Rostrum consisting of two spines, usu- 

 ally long and slender. Eyes small, and retractile against a sharp postocular 

 process commonly but little cupped ; a supraocular eave terminating either 

 in a forwardly directed tooth or in an upturned spine. Basal antennal 

 article not very broad, sharply truncated ; the mobile portion of the 

 antennae freely exposed on either side of the rostrum. 



Merus of the external maxillipeds as broad as the ischium, slightly 

 expanded at the anteroexternal angle, and bearing the palp at the antero- 

 internal angle. 





