62 RATHBUN 
but there is some individual variation. The usual number of spines is 
one on the second and sixth segments and two on each of the other 
segments. 
Distribution.— Arctic coast of America; Bering Sea to Puget Sound; 
Kamchatka; Okhotsk Sea; Atlantic coast of America from Greenland 
to Narragansett Bay, Rhode Island, 1-72 fathoms: 
Berg Bay, Glacier Bay, Alaska (Harriman Expedition). 
Dredged by the A/datross from off Cape Menshikof, Bering Sea, to the 
Aleutian Islands and Portlock Bank, Alaska, in 16 to 72 fathoms; at 
the unusual depth of 283 fathoms, off Seguam, Aleutians, a lot of 
large specimens, the largest 9 measuring 77 mm., the largest ¢ 67 mm.; 
Strait of Fuca and Puget Sound, 40-48 fathoms; off Kamchatka, 
12 and 42 fathoms, stations 3780 and 3781; Avacha Bay, Kamchatka, 
16 fathoms, station 3642; Rakovaya Bay, Avacha Bay; off Robben 
Island, Okhotsk Sea, 10 fathoms, station 3645. 
Various localities from Kadiak westward along the Aleutian Islands, in 
3-25 fathoms (W. H. Dall). 
Puget Sound (T. Kincaid). 
Avacha Bay and Petropavlovsk, Kamchatka (L. Stejneger). 
Bering Island, among Laminaria, and Solovarennaja Bay, Petropavlovsk, 
Kamchatka, 10-12 fathoms (N. Grebnitzky). 
Arctic Ocean (Stimpson). 
SPIRONTOCARIS LAMELLICORNIS (Dana). 
Hippolyte lamellicornis DANA, Proc. Acad. Nat. Sci. Phila., 1852, 24; Crust. 
U. S. Expl. Exped., 1, 567, 1852, pl. XxxvI, fig. 6, 1855.—STIMPSON, 
Jour. Boston Soc. Nat. Hist., v1, 498, 1857.—KINGSLEY, Bull. Essex 
Inst., .X, 62, 1878. 
Spirontocaris lamellicornis WALKER, Trans. Liverpool Biol. Soc., XII, 277, 
1898.—HOLMES, Occas. Papers Calif. Acad. Sci., VII, 208, 1g00. 
This species, though resembling strongly S. spina, is at once separated 
by the acuteness of the lateral margins of the first to third abdominal 
segments, which in S. spina are broadly 
rounded. The rostrum is about three 
fourths as long as the rest of the cara- 
pace, and does not exceed the antennal 
scale, although it may exceed the blade 
Fic. 18. Spirontocaris lamellicornis. Side of the scale. The spine of the scale ex- 
of carapace of ¢ (x 18). Station 3046. tends beyond the blade to a distance 
equaling or exceeding the distal width of the blade. The dactyli of the 
last three pairs of feet are longer than in S. sina, those of the last pair 
being half the length of their propodi; they are armed with spinules so 
minute that the segment appears entire in comparison with S. spina. 
Dimensions.— 2, length 63 mm., carapace 23 mm. 
