PART 1 GARTH : PACIFIC OXYRHYNCHA 61 



son's genus. Examination of E. bifida, however, reveals the presence 

 of the interantennular spine, although in much reduced form. The 

 second and third sentences in the first paragraph above represent a 

 return to the original description in this particular, while allowing 

 equally well for Rathbun's Pacific species. Keys, diagnoses, and descrip- 

 tions of species have been modified accordingly. 



Range: From San Benito Islands, Lower California, and Tepoca 

 Bay, Gulf of California, Mexico, to Cape San Francisco, Ecuador. 

 Socorro, Clarion, Cocos, and Galapagos Islands. 1-150 fathoms. Occurs 

 also in the Atlantic, from off Nantucket Island, Massachusetts, to 

 Grenada and Barbados in the West Indies. 



Key to the Pacific American Species of Euprognatha 



la. Interantennular spine rudimentary, antennal spines equally ad- 

 vanced with front. Postocular tooth slender. Two spines at 

 intestinal level. Chelipeds of adult male little more than twice 

 the length of carapace. Lateral projection of male first pleopod 

 a semicylindrical lobe bifida 



lb. Interantennular spine salient, antennal spines exceeding front. 

 Postocular tooth a broad lobe. One spine at intestinal level. 

 Chelipeds of adult male almost four times carapace length. 

 Lateral projection of male first pleopod a low arcuate flap 

 granulata 



Euprognatha bifida Rathbun 

 Plate B, Fig. 8 ; Plate 3, Fig. 3 



Euprognatha bifida Rathbun, 1893b, p. 231; 1923b, p. 633; 1925, p. 



103, pi. 34, figs. 5, 6. Crane, 1937, p. 55. Garth, 1948, p. 22. 

 Batrachonotus nicholsi Rathbun, 1894, p. 55; type locality, Gulf of 

 California; female holotype, U.S.N.M. No. 18107; 1898, p. 570; 

 1925, p. 127, pi. 39, figs. 5-8. 

 Type: Male holotype, U.S.N.M. No. 17335, length 9 mm, width 

 7 mm. 



Type locality: Off San Josef [Jose] Island, Gulf of California, 

 Mexico, 33 fathoms, Albatross station 3001. 



Localities subsequently recorded, with collectors: Mexico: Lower 

 California: Off Cedros Island, 33 meters, Scripps Institution (Rathbun, 

 1925) ; middle of east side of Cedros Island, Albatross (Rathbun, 

 1923b) ; off Abreojos Point, 48 fathoms, Magdalena Bay, 12 and 15 



