88 University of California Publications in Zoology (Vow. 23 
Crago alaskensis elongata (Rathbun) 
Crangon alaskensis elongata Rathbun, Proc. U. 8. Nat. Mus., 24, 888, 1902; 
H. A. E., 10, 115, fig. 54, 1904. 
a b 
Fig. 58. Crago alaskensis elongata, 2; a, acicle, X 2; b, anterior portion of 
carapace, X 21%, (from Rathbua, U. S. N. M.). 
Characters.—Antennal scale as long as the carapace, exclusive of the rostrum; 
antero-internal angle of blade rounded and not produced; spine extending consider- 
ably beyond the blade. Hands from two and a half to three times as long as 
wide; anterior margin, against which dactylus closes obliquely forming an angle 
of about 45° with the lengthwise margin. Fifth segment of abdomen with superior 
median carina. 
Dimensions.—Type, ovigerous female: length from tip of rostrum to tip of 
telson 55.7 mm., length of carapace, 13.5 mm., of antennal scale 11.6 mm. The 
San Francisco Bay material ranged in length, from tip of rostrum to end of telson, 
for the smallest specimen, a male, 11 mm., to 55 mm. for the largest, an ovigerous 
female; the greater number of the specimens averaged about 44 mm. in length. 
Type Locality—Off Santa Barbara, California, 29 fathoms (‘‘ Albatross’’ 
stations 2970, 2971). 
Distribution.—British Columbia to United States Mexican boundary line. 
Remarks.—This subspecies is a form of C. alaskensis, which is found from 
Puget Sound northward. It differs from the typical C. alaskensis in that the 
rostrum is longer and narrower; the outer flagellum of the antennules falls con- 
siderably short of the antennal scale; the antennal scale is much longer, about 
equaling the length of the carapace exclusive of the rostrum. 
Biological Survey of San Francisco Bay.—Crago alaskensis elon- 
gata was taken in numbers of twenty or more at all outside stations at 
which the depth exceeded 19 fathoms, D 5785-5792 except D 5788, 
60 to 68 fathoms, where only two specimens were obtained. Pandalus 
jordant was taken at all but the most shoal of these stations, D 5792. 
19 to 26 fathoms, the others being all over 29 fathoms in depth. The 
bottom uniformly was very fine green sand except at D 5791, where 
little else than refuse and garbage was brought up. For these stations 
the observed temperature and salinity ranges are respectively 9.3° to 
12.2° C, and 33.8 to 34.3. 
