1921] Schmitt: The Marine Decapod Crustacea of California 19 
Tribe PENEIDES 
Kerry TO THE CALIFORNIA FAMILIES OF THE PENEIDES 
I. Last two pairs of legs well developed. / 
Peneidae, p. 20. 
II. Last one or two pairs of legs reduced in size, rudimentary or wanting. 
Sergestidae, p. 19. 
Family SERGESTIDAE 
Rostrum 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. Rostrum 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. Rostrum spiniform. Cornea larger than eye-stalk. (Known only from 145+ 
fatl : 
eee) similis, p. 19. 
II. Rostrum lobiform. Cornea no larger than eye-stalk. (Known only from 417 
fath ; 
athoms. ) sp. indet., p. 20. 
Sergestes similis Hansen 
Plate 12, figure 7 
Sergestes atlanticus Bate, ‘‘Challenger’’ Rept. Zool., 24, Macrura, p. 389, 
1888 (part: specimen from station 232). 
Sergestes similis Hansen, Proe. Zool. Soc. London, p. 60, pl. 11, figs. 6a—6d, 
1903. 
Sergestes atlanticus Rathbun, H. A. E., 10, 145, 1904 (part: only specimens 
taken by the ‘‘Albatross’’), not S. atlanticus Milne Edwards. 
a = ee 
Fig. 8. Sergestes similis, a, dorsal view of anterior end, X 5; b, lateral view 
of rostrum, X 12 (after Hansen). 
