1921 J Schmitt: The Marine Decapod Crustacea of California 19 



Tribe PENEIDES 



Key to the California Families of the Peneides 



I. Last two pairs of legs well developed. 



^ b r Peneidae, p. 20. 



II. Last one or two pairs of legs reduced in size, rudimentary or wanting. 



Sergestidae, p. 19. 



Family Sergestidae 



Eostrum very small or wanting. Antennules with two flagella, one long and 

 one short, rudimentary one which in the male is frequently furnished with a small 

 tertiary branch. Mandibles with cutting edge smooth, and palp of two segments. 

 First pair of legs simple, second and third pairs minutely chelate, legs increasing 

 in length from first to third pairs; fourth and fifth pairs simple, reduced in size 

 and number of segments. 



Genus Sergestes Milne Edwards 



Body long and slender, integument membranaceous. Eostrum very short. 

 Antennules without a scale on inner edge; of the two antennular flagella, one is 

 very long and the other very short, the short one in the male bifurcating to form 

 a prehensile apparatus. Mandibular palp long, thin, and narrowly foliaceous. No 

 exopodites on any of the thoracic appendages except the first maxillipeds. 



Key to the California Species of Sergestes 



I. Eostrum spiniform. Cornea larger than eye-stalk. (Known only from 145 + 



fathoms.) 



similis, p. 19. 



II. Eostrum lobiform. Cornea no larger than eye-stalk. (Known only from 417 



fathoms. ) 



sp. indet., p. 20. 



Sergestes similis Hansen 

 Plate 12, figure 7 



Sergestes atlanticus Bate, ' ' Challenger ' ' Eept. Zool., 24, Macrura, p. 389, 



1888 (part: specimen from station 232). 

 Sergestes similis Hansen, Proc. Zool. Soc. London, p. 60, pi. 11, figs. 6a-6d, 



1903. 

 Sergestes atlanticus Eathbun, H. A. E., 10, 145, 1904 (part: only specimens 



taken by the "Albatross"), not S. atlanticus Milne Edwards. 



Fig. 8. Sergestes similis, a, dorsal view of anterior end, X 5; o, lateral view 

 of rostrum, X 12 (after Hansen). 



