PART 1 GARTH : PACIFIC OXYRHYNCH A 91 



Rathbun in the paragraph quoted above, whereas the key to relation- 

 ship of divergent forms is often to be found in their developmental 

 stages. In support of the position taken, it should be noted that the male 

 first pleopod of P. tuberculata, so similar in many respects to that of 

 Inachoides microrhynchus, resembles no less that of Erileptus spinosus, 

 which for reasons even more compelling must remain in another genus. 

 The extension of range of the species from Monterey Bay to 

 Tomales Bay, north of San Francisco, California, deserves special com- 

 ment. A specimen sent the writer by Robert J. Menzies of Pacific 

 Marine Station, Dillon Beach, was recovered from the nets of fishing 

 boats that do not leave Tomales Bay and so could not have been taken 

 at a more southerly locality. 



Genus ERILEPTUS Rathbun 



Erileptus Rathbun, 1893b, p. 226; 1925, p. 68. 



Type: Erileptus spinosus Rathbun, by monotypy. 



Description: Carapace pyriform, convex, regions well defined; 

 rostrum simple, slender; postorbital and supraorbital spines present. 

 Sexes differing in shape of carapace, postorbital spine and cheliped. 

 Basal article of antennae long and narrow, with spine at distal end. 

 Anterointernal lobe of ischium of outer maxilliped large and strongly 

 advanced ; merus subtriangular, the anterior margin the longest ; outer, 

 or principal, margin of next article nearly as long as outer margin of 

 merus and almost straight until near distal end where it forms an 

 elbow ; terminal article unusually long. Chelipeds of male extremely long. 

 Ambulatory legs very slender, decreasing in length from first to fourth 

 pair and in male much shorter than chelipeds. (Rathbun, 1925) 



Abdomen of male with six, of female with five segments. 



Range: From San Miguel Island and Point Santa Barbara, Cali- 

 fornia, to Entrada Point, Magdalena Bay, Lower California, Mexico; 

 in the Gulf of California from Rocky Point, Sonora, to Gorda Banks. 

 Extralimital : Ladrones Islands, Panama. 2-300 fathoms. Contains but 

 one species. 



Erileptus spinosus Rathbun 

 Plate E, Fig. 8 ; Plate 5, Fig. 2 



Erileptus spinosus Rathbun, 1893b, p. 227; 1904, p. 171, pi. 10, fig. 1; 

 1925, p. 68, pis. 212, 213, text-fig. 18. Holmes, 1900, p. 21. Wey- 

 mouth, 1910, p. 27, pi. 3, fig. 7. Crane, 1937, p. 54. 



