84 University of California Publications in Zoology [Vol.23 



b. Anterior median spine projecting in front of the line of the 



orbits. Hands much as in preceding species, but with anterior 



margin of hand more longitudinal. 



acclivis, p. 98. 



2. First to fourth abdominal segments more or less carinated. Hands 

 about three times as long as wide. 



a. First to third abdominal segments armed laterally with one or 



two spines each. 



i. First to third segments armed laterally with one spine each; 



spine of third segment obsolescent in the male. (Known 



only from 525 + fathoms.) 



lomae, p. 100. 



ii. First to third segments armed laterally with two spines each. 

 (Not known south of Point Conception.) 



spinosissima, p. 100. 



b. First to third abdominal segments laterally unarmed. (Known 



off California only from 158 + fathoms.) 



variabilis, p. 99. 



B. Second lateral carina of the carapace armed with a spine a little behind 



the superior lateral spine. First to fourth abdominal segments 



smooth. Hands of first pair of feet are two and one-half times as 



long as wide, swollen; the anterior margin more longitudinal than 



transverse. (Not known south of Laguna Beach.) 



munitella, p. 101. 



I. Group with gastric region not depressed below the general level of the carapace. 



Antennal scale with spine exceeding blade except in C. nigricauda, in which 



it is variable, usually longer but sometimes shorter than the blade. 



Section a. Carapace with one or no median spines. (C. stylirostris is the only 

 species in this section which lacks the median gastric spine, although with a lens 

 one can discern a scabrous granule where the spine usually occurs in the other 

 members of this group.) (For section b, see p. 95.) 



Crago nigricauda (Stimpson) 



Crangon nigricauda Stimpson, Proc. Calif. Acad. Sci., 1, 97, 1856; Jour. 

 Boston Soc. Nat. Hist, 6, 496, pi. 22, fig. 6, 1857; Holmes, Oecas. Papers 

 Calif. Acad. Sci., 7, 170, pi. 2, fig. 31, 1900 (in part) ; Rathbun, H. A. B., 

 10, 112, fig. 50, 1904. 



a b 



Fig. 56. Crago nigricauda ; a, chela, X 2% (from Bathbun, U. S. N. M.) ; 

 b, acicle (after Holmes). 



Characters. — Antennal scale about two-thirds the length of the carapace ; 

 antero-internal angle rounded and produced, reaching nearly as far forward as 

 the spine at the outer angle, sometimes farther than the spine. Hands oblong, 



