é 
[From the BULLETIN OF THE ESSEX INSTITUTE, Vol. X, Nos. 10, 11, I2, 1878.] 
NOTES ON 
EFACINIC COAST CRUSTACEA. 
By W. N. Lockineron. 
oe 
Crangon nigricauda Stimpson. 
The identity of this species with the C. vulgaris of the Atlantic is 
suspected. Owen, and after him Dana, mentions it as C. vulgaris, and 
Kingsley, in his ‘‘List of the North American Caridea” (Bull. Essex 
Inst., Vol. 10, Nos. 4, 5, 6, p. 54) says of C. nigricauda, C. vulgaris, and 
C. alaskensis Lock. (Proc. Cal. Acad. Sci., 1876, p. 34), ‘‘I am inclined 
to consider the three species above as the same, but need larger series 
to decide.” 
In an unpublished MSS., written previous to the publication of the 
above list, I find the following notes: ‘*C. alaskensis does not appear, 
on further examination, to be distinct. Minute black spots, like those 
scattered over the body and hands in the specimens described under 
this name, are also abundant in fresh specimens of C. nigricauda from 
San Francisco Bay, and sometimes persist in alcohol.” 
This species, therefore, is known to range along the Pacific coast 
from Alaska to San Diego, from which last locality were obtained 
specimens which, from the persistence in a dried state of a single 
black spot on each side of the tail, were described by me as C. nigro- 
maculata (Proc. Cal. Acad., loc. cit.). 
Crangon munitus Dana, U. S. Ex. Exp. Crust., p. 536, pl. xxxiil, 
fig. 5. 
A well-armed form obtained in Magdalena Bay, Lower Cal., by W. 
J. Fisher, and having, besides the infra-orbital, antennal, and hepatic 
spines, four spines upon the upper surface of the carapax, one on 
each side of the centre line, and two spines in the centre line, the 
posterior one placed far back, must, I believe, be referred to this spe- 
cies, which is thus proved to have a very considerable range, since 
Dana obtained it in Puget Sound. The rostrum is broader than usual 
in the genus, and the last abdominal segment is exceedingly com- 
pressed, the abdomen tapering rapidly at the fifth segment. 
(159) 
