26 University of California Publications in Zoology L v ol- 23 



Tribe CARIDES 

 Key to the California Families of the Carides 



I. Exopodites on all legs; first two pairs chelate; second wrists undivided. 



A. Exopodites of second maxillipeds rudimentary or wanting. Eostrum 



short or wanting, often represented by a postfrontal tooth or spine. 



Pasiphaeidae, p. 27. 



B. Exopodites of second maxillipeds large. Eostrum moderately or well 



developed. 



Oplophoridae, p. 32. 



II. No exopodites on legs. 



A. One or both legs of first pair simple; legs of second pair unequal, second 



wrists subdivided (multiarticulate). 



1. Only one leg . of first pair simple, the other chelate. Eostrum not 



toothed except at apex, which is obscurely bifid. (Not known 

 north' of San Diego. ) 



Lysmatidae, p. 80. 



2. Both legs of first pair simple; first two pairs slender. Eostrum large 



and toothed. 



Pandalidae, p. 40. 



B. Both legs of first pair chelate or subchelate. 



1. First pair of legs subchelate; second wrists undivided. Eostrum 



small, or wanting; occasionally a somewhat elongate suberect 

 spine. 



Cragonidae, p. 81. 



2. First pair of legs chelate; second wrists either subdivided or undi- 



vided. 



a. Second wrists undivided. 



i. First antennae with two flagella, one usually cleft a little dis- 

 tance from the tip. (Not known north of Santa Cruz 

 Island.) 



Pontoniidae, p. 37. 

 ii. First antennae with three flagella, owing to cleavage of one 

 almost, or quite to the base. (Not known north of San 

 Pedro.) 



Palaemonidae, p. 34. 



b. Second wrists subdivided (multiarticulate). 



i. Eyes covered by carapace. First legs much stronger than the 

 rest; second wrists divided into five segments. Eostrum 

 small or wanting. 



Crangonidae, p. 73. 



ii. Eyes not covered by carapace, free. First legs not much 



stronger than the rest; second wrists divided into three, 



seven, or many segments. Eostrum generally prominent. 



a. Second pair of legs equal or subequal; wrists divided into 



three, seven, or about thirty-two segments. Eostrum 



toothed; rarely reduced in size. 



Hippolytidae, p. 47. 



