888 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
a blunt median point. The leaves of the andricuni are small and not 
in contact. 
Dimensions. — Male, leng-th of carapace and rostrum, 18.6 mm.; of 
a])domen, 29 mm. 
TypelocaUty. — Off Copper Island, Kamchatka, 1,567 fathoms, station 
3783, U. S. Fish Commission steamer AJhatnm (Cat. No. 25241). 
Distrihidion. — Also taken in Bering Sea, north of Rat Islands, 
Aleutians, 850 fathoms, .station 3781:. 
Family CRANGONID^E. 
Genus CRANGON. 
a. Group of C. nigricauda, in. which (he carapace has only one median spine, and the 
gastric region is not depressed below the general level. 
CRANGON ALASKENSIS ELONGATA. 
Dr. S. J. Holmes, in his very useful Synopsis of California Stalk- 
Eyed Crustacea,^ has given the synon3'my and diagnoses of seven species 
of Crangon known to occur on the west coast of the United States. I 
would exclude Crangon alaskensu Lockington from the synonymy of 
C nigricauda Stimpson, and raise it to specific rank, as in a large 
series of specimens it differs from C. nigricauda in the antenual scale 
being a little longer and much narrower distally, the extremity of the 
blade not produced at the antero-internal angle, the spine longer; the 
first pair of trunk feet shorter; hands more slender, their distal margin 
more oblique. C. nigricauda ranges from British Columbia to Lower 
California, O. alaskensi.^ from Bering Sea to Straits of Fuca. 
Typical C. alaskensis passes b}^ insensible gradations into a form 
occurring off' the coast of California and Oregon in 9 to 53 fathoms, 
which differs in its longer and narrower rostrum, in the outer anten- 
nular tiagellum falling considerably short of the antennal scale, in the 
much longer scale, equal to the length of the carapace exclusive of the 
rostrum, in the fourth segment of the abdomen showing signs of cari- 
nation, in the telson flattened above, though scarcely grooved, while 
its tip is more acute than in typical C. alaskensis. 
Dimensions. — Length of ovigerous female from tip of rostrum to 
tip of telson, 55.7 mm.; length of carapace, 13.5 mm.; of antennal 
scale, 11.6 mm. 
Ty2ye Jocality. — Off Santa Barbara, California, 29 fathoms, U. S. Fish 
Commission steamer Albatross stations 2970 and 2971 (Cat. No. 25242). 
CRANGON HOLMESI. 
Allied to C. alha Holmes in not having a groove on the under side 
of the sixth abdominal somite. (Jarapace a third as long as abdomen; 
rostrum short, narrow, triangular, tip rounded. Antennal scale as 
^Occasional Papers of the California Academy of Sciences, VII, 1900. 
