PART 1 garth: pacific oxyrhynch a 103 



too often females or immature, frequently with appendages missing, it 

 has been found desirable to base keys and diagnoses on a combination of 

 characters. Over twenty have been found useful, although some apply 

 to one or two species only. Of these may be mentioned the ratio of the 

 length of the rostrum and of the first ambulatory leg to the postrostral 

 length of the carapace, the ratio of the dactyli of the first and fourth 

 ambulatory legs to their respective propodi, the presence or absence of a 

 postorbital lobe or granule, the presence of cardiac and gastric tubercles 

 and the number of the latter, the nature of the hepatic and ptery- 

 gostomian protuberances, the contour and surfacing of the branchial 

 areas, the extent of encroachment of the carapace towards the bases of 

 the ambulatory legs, the degree of inflation of the male manus and the 

 shape of the gape between the fingers (a late developing character), the 

 concave or ridged contour of the basal antennal article, the amount of 

 internal projection of the merus of the external maxilliped, the degree 

 of approximation of the sternal plates and the texture of their surface, 

 the number of median tubercles on the first abdominal segment, the 

 number of clusters of curved hairs that may be counted along the 

 propodus of the first leg, and the peculiarities of the dactyli of the 

 various pairs of walking legs. Since existing descriptions are usually too 

 brief to cover all the desired points, it has been found necessary to 

 supplement them to a considerable extent in the accounts of species to 

 follow. 



Range: From Monterey Bay, California, to Santa Elena Bay, 

 Ecuador, including the Gulf of California; Guadalupe Island; Revilla 

 Gigedo, Cocos, and Galapagos Islands; occurs also in the Atlantic from 

 North Carolina to Pernambuco, Brazil; Bermudas. Shore to a depth 

 of 125 fathoms; in the Atlantic to 201 fathoms. 



"Podonema peut-etre d'espece nouvelle," Bouvier (1895, p. 8), is a 

 Podochela which cannot be placed with certainty because of the meager 

 data given. 



Key to the Pacific Species of Podochela 



la. Rostrum long, ending in a spine, usually entire, but with tip 

 occasionally bifurcate 

 2a. Only one tubercle on first abdominal segment 



3a. First ambulatory leg long and slender, its propodus 

 unarmed 



4a. A conspicuous postorbital tubercle; dactylus of 

 fourth leg equal to five-eighths of propodal length 

 hemphilli 



