84 University of Califorma Publications in Zoology [VOoL. 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. rare 
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. ) i 100 
omae, p. F 
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.) vasa: 
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, Proce. Calif. Acad. Sci., 1, 97, 1856; Jour. 
Boston Soc. Nat. Hist., 6, 496, pl. 22, fig. 6, 1857; Holmes, Occas. Papers 
Calif. Acad. Sci., 7, 170, pl. 2, fig. 31, 1900 (in part) ; Rathbun, H. A. E., 
10, 112, fig. 50, 1904. 
a b 
Fig. 56. Crago nigricauda; a, chela, X 2%4 (from Rathbun, U. 8. 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, 
