DECAPODS 87 
Typical form.—In the typical S. gaimardii (Milne Edwards), of which 
Hippolyte gibba Kroyer is probably the male form, there is in the female 
no lobe on the third abdominal segment (in a side view), although the 
segment is somewhat compressed; the rostrum is distinctly shorter than 
the antennal scale, scarcely if at all longer than the carapace, and is 
armed with fewer spines. In both sexes the scale is longer and wider 
in the typical form, being about four fifths as long as the carapace. 
Distribution.— S. gaimardii belchert is found from the Arctic coast of 
Alaska and Siberia southward to Sitka, taking the place of typical 
S. gaimardii; it occurs also in Kara Sea (Dijmphna Exped.), Nova 
Zembla (Birula), and at Nakvak, Labrador (L. M. Turner). 
Lat. 70° 15/10 N., long. 162° 55’ 00’ W., 16 fathoms; lat. 719 02! 
oo” N., long. 157° 46/ 00’ W., 19 fathoms; and off Point Hope, Alaska, 
25 fathoms (U.S. R. S. Corwin). 
Ten miles west of Point Franklin, 13% fathoms (Point Barrow Exped.). 
Bering Strait and Bering Sea in lat. 66° 12’ oo” N., long. 168° 54! 
oo” W., 30 fathoms; lat. 64° 12’ oo” N., long. 162° 52’ oo! W., 17 
fathoms; lat. 62° 15’ oo’ N., long. 167° 48’ 00” W., 20% fathoms 
(Lieutenant George M. Stoney, U. S. N.). 
Plover Bay, Siberia, 10 to 25 fathoms; Cape Lisburne; off Cape Sa- 
bine, 13 fathoms; Bering Strait, 13 fathoms; Sitka Harbor, zg fathoms 
(W. H. Dall). 
Off mouth of Yukon, 31% fathoms (E. W. Nelson). 
Off St. Matthew Island, 37 fathoms, station 3519; off Pribilof Islands, 
50 to 52 fathoms (A//azross stations 3527 and 3611). 
That the de/cheri form cannot be considered a species is shown by the 
existence of specimens which unite the characters with those of S. gai- 
mardi. In three females from Henley Harbor, Labrador, the abdomen is 
without a lobe, but the rostrum is longer than the rest of the carapace, 
and just as long as the acicle; the acicle is long as in typical S. gaz- 
maradit. 
SPIRONTOCARIS TOWNSENDI Rathbun. 
Spirontocaris gaimardii RATHBUN, The Fur Seals and Fur-Seal Islands of 
the North Pacific Ocean, Pt. III, 556, 1899 (part). 
Spirontocaris townsendi RATHBUN, Proc. U. S. Nat. Mus., XXIV, 897, 1902. 
On the Pacific coast there is a large group of species of the gaimardii 
type, which can be distinguished only by the closest observation. Of 
these species, .S. fownsendi resembles S. gaimardii and S. gaimardii belcheri 
in having the outer maxilliped provided with an exopod and epipod, and 
the first two feet also with epipods. S. éowmsendi continues the range of 
