1921] Schmitt: The Marine Decapod Crustacea of California 21 
b. Second pair of legs unequal, wrist of longer leg about 
twice length of shorter one, wrists multiarticulate. Ros- 
trum not toothed, except at apex, which is obscurely 
bifid. (Not known north of San Diego.) 
Lysmatidae, p. 80. 
Family PastpHAEIDAE 
Rostrum 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. Rostrum 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. Rostrum 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. 
