PART 1 GARTH : PACIFIC OXYRHYNCHA 473 



species, which was taken in greater numbers and at more stations than in 

 the Gulf of California or the southern portion of the Bay of Panama. 



The range of the species is extended northward to Hughes Point, 

 west coast of Lower California, and the north end of Angel de la 

 Guarda Island, Gulf of California, Mexico, and southward to La Liber- 

 tad, Ecuador. There remains, however, a large gap in distribution be- 

 tween Isabel Island, Mexico, and Costa Rica. Whether or not because 

 of this isolation, Gulf of California specimens are proportionately wider 

 as compared with length than are Bay of Panama specimens, which ap- 

 proach the Atlantic Cryptopodia concava more closely in this regard. 



Genus HETEROGRYPTA Stimpson 



Heterocrypta Stimpson, 1871a, p. 102. Alcock, 1895, p. 283. Rathbun, 

 1925, p. 554. 



Type: The Atlantic Cryptopodia granulata Gibbes, 1850, by original 

 designation. 



Description: Differing from Cryptopodia in the following characters: 

 posterior border of the carapace slightly overlapping the abdomen, but 

 not distinctly produced ; the lateral clypeiform expansions also less pro- 

 duced, legs when even moderately extended seen beyond them. Ptery- 

 gostomian and subhepatic regions traversed by a granular ridge running 

 parallel to the anterolateral border from the angle of the buccal cavity 

 to the base of the chelipeds. (Alcock, modified) 



Range: Eastern Pacific from Drakes Bay, Marin County, Califor- 

 nia, to Cape Pasado, Ecuador. Western Atlantic from Nantucket Sound, 

 Massachusetts, to St. Thomas, West Indies. 1.5-95 fathoms. Eastern 

 Atlantic; Mediterranean Sea. Indo-Pacific from Red Sea to Japan. 



Key to the Pacific American Species of Heterocrypta 

 (From Rathbun, Modified). 

 la. Branchial ridge terminating at a point inside lateral angle of 

 carapace 



2a. Posterolateral margin deeply concave between terminus of 

 branchial ridge and lateral angle of carapace. Chelipeds 



elongate, equal macrobrachia 



2b. Posterolateral margin not deeply concave between terminus 

 of branchial ridge and lateral angle of carapace. Chelipeds 



short, unequal colombiana 



lb. Branchial ridge terminating at lateral angle of carapace 



occid en talis 



