1921 J Schmitt: The Marine Decapod Crustacea of California 27 



6. Second pair of legs unequal, wrist of longer leg about 

 twice length of shorter one, wrists multiarticulate. Bos- 

 trum not toothed, except at apex, which is obscurely 

 bifid. (Not known north of San Diego.) 



Lysmatidac, p. 80. 



Family Pasiphaeidae 



Eostrum short or wanting, often represented by a postfrontal (gastric) tooth 

 or spine. Mandibles lacking molar process, consisting of incisor process alone, 

 with or without palp of one or two segments. Exopodites present on all thoracic 

 legs and on third or external maxillipeds, rudimentary or wanting on second max- 

 illipeds but often constituting the chief part of the first maxillipeds. First two 

 pairs of legs similar, ending in elongate chelae with long, slender fingers, and 

 stouter than the remaining three pairs, which are undersized and imperfectly 

 formed. 



Key to the California Genera of the Pasiphaeidae 



. I. Eostrum wanting, represented by a postfrontal (gastric) tooth or spine. 



Pasiphaea, p. 27. 

 II. A short, normally formed rostrum present. 



Parapasiphae, p. 31. 



Genus Pasiphaea Savigny 



Body strongly compressed. Eostrum wanting, represented by a postfrontal 

 gastric spine or tooth. Frontal margin of carapace with orbits but slightly 

 excavate and imperfectly defined. Mandibles without a palp. 



Key to the California Species of Pasiphaea 



I. Carapace carinated throughout its length. 



A. Telson truncate, not forked or notched. (Known only from 250 + 



fathoms.) 



magna, p. 28. 



B. Telson forked or notched. 



1. Branchiostegal spine over the angle of the anterolateral sinus. 



pacifica, p. 29. 



2. Branchiostegal spine farther forward, near or on anterior margin. 



a. Telson longer than sixth segment. (Known only from 250 + 



fathoms.) 



emarginata, p. 30. 



b. Telson shorter than sixth segment. (Known only from 750 + 



fathoms.) 



corteziana, p. 30. 



II. Carapace not carinated in its posterior half. (Known only from 950 + 

 fathoms.) 



affinis, p. 31. 



