DECAPODS 19 



SYSTEMATIC DISCUSSION OF SPECIES. 



Suborder MACRURA. 



Family PASIPH^IDJE. 



Genus Pasiphaea Savigny. 



KEY TO THE SPECIES OF PASIPH^A. 



A. Carapace carinated throughout its length. 



B. Telson truncate, not forked or notched magna, 



W. Telson forked or notched. 

 C. Branchiostegal spine over the angle of the antero-Iateral 



sinus pacifica, 



C Branchiostegal spine farther forward, near or on anterior 

 margin. 

 D. Telson longer than sixth segment .... emarginata. 

 D'. Telson shorter than sixth segment. 



E, Abdomen carinate princeps. 



E'. Abdomen not carinate corteziana. 



A'. Carapace not carinated in its posterior half affinis. 



PASIPHJEA MAGNA Faxon? 



Pasiphcea magna Faxon, Bull. Mas. Comp. Zool., xxiv, 209, 1893; Mem. 

 Mus. Comp. Zool., xviii, 176, pi. XLV, figs. 2-2C, 1895. Gulf of Panama, 

 458 fathoms. 



Distribution.— Yxoxci off Point Arena, California, to Gulf of Panama; 

 265 to 552 fathoms. 



Dredged by the Albatross at the following localities : 

 Off Point Arena, California, 455 fathoms, station 3348. 

 Off the Farallones, California, 552 fathoms, station 3162. 

 Off San Francisco, Cahfomia, 276 fathoms, station 3479. 

 Off Pigeon Point, Cahfornia, 296 fathoms, station 31 12. 

 Off Monterey Bay, California, 418-456 fathoms, stations 3126, 3127. 

 Off Point Sur, Cahfornia, 328 fathoms, station 3186. 



The identification of these specimens with P. magna is doubtful, but 

 as I have not had the opportunity of comparing them with the type, 

 they are placed here provisionally. Though from the same depth of 

 water, the integument is much firmer in our examples than in the type, 

 the carapace is deeper and its dorsal outline less arched, the branchial 

 ridge is straighter throughout the posterior half of its course, the palm in 

 the first pair of chelae is longer than the fingers. 



The largest specimen, an ovigerous female (((^ 

 from station 3348, is 155 mm. long. The tel- 



. , . , , Fig. I. Pasiphcea magna. Tel- 



son is a httle longer than the sixth segment of son (x ij). station 3348. 



