116 RATHBUN 
rostrum, too, is often intermediate between typical a/askensis and typical 
alaskenstis elongata. 
CRANGON SEPTEMSPINOSA Say. 
Crangon septemspinosus SAY, Jour. Acad. Nat. Sci. Phila., 1, 246, 1818. 
Crangon crangon and Crangon vulgaris of authors (part). 
Associated sometimes with C. a/askensis, which it closely resembles ; 
it can be recognized at once by the rounded (non-carinated) abdominal 
segments. In Alaskan specimens the antennal scale is a little more than 
two thirds the length of the carapace; it is equal to or 
| = = exceeds the distance from the gastric spine to the pos- 
terior margin; the extremity of the blade is obliquely 
ee Boe subtruncate, slightly rounded, the antero-internal angle 
(Xx 2). Station 323° retreating; the spine surpasses the blade to a distance 
exceeding the anterior width of the blade. The hands are variable in 
length, being from three to three and one half times as long as wide; 
the obliquity of the terminal margin is as in C. alaskensis. All the ab- 
dominal segments are free from carine; the sixth and seventh have a 
slight median sulcus. 
There is considerable variability in Atlantic specimens of this species, 
in the length both of the scale and of the hands; I cannot see that our 
Alaskan specimens differ essentially from those of Chesapeake Bay. 
Dimensions. — Female, station 3230, length from tip of rostrum to tip 
of telson 60.4 mm., length of carapace 15.6 mm., length of antennal 
scale 11 mm. 
Color.—It is probable that in life the species could readily be detected 
by the color markings. In alcohol the speckles of the dorsal surface 
are more uniform and closer than in C. alaskensis, and the telson and 
uropods are darker than in C. alaskensis from the same dredge haul. 
Distribution.—This species is less abundant along the Alaskan coast 
than C. alaskensis,; it extends from the Arctic coast of Alaska at 
Eschscholtz Bay southward along the eastern shore of Bering Sea to the 
Shumagins; the separate localities are as follows: 
Chamisso Harbor, Eschscholtz Bay, 5-8 fathoms (W. H. Dall). 
Port Clarence, in the seine, with C. alaskensis (W. H. Dall). 
St. Michael, Norton Sound (L. M. Turner; E. W. Nelson). 
Head of Norton Sound, 5 fathoms (Point Barrow Expedition). 
Off mouth of Yukon, 3% fathoms (E. W. Nelson). 
Cape Etolin, Nunivak Island, anchorage, 8 fathoms, stony (W. H. Dall). 
Hagemeister Strait, 8-15 fathoms, gravel (W. H. Dall). 
Bristol Bay (C. L. McKay). 
Bristol Bay, 314 fathoms, with C. adaskensis (Albatross station 3230). 
