896 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
three times as long as third; basal scale two-thirds as long- as tirst 
segment. Acicle two-thirds as long as carapace, oblong-lanceolate; 
peduncle reaching middle of acicle. Outer maxilliped extends beyond 
antennal scale ])y half the length of its last segment; without exopod, 
but with an epipod; first three pairs of feet with epipods. 
Dimensions. — Female, length 39 nuu., of carapace and rostnun 1-t 
nmi., of rostrum 5 mm. 
Tyjye locality. — Off Sea Lion Rock, Washington, 685 fathoms, station 
3071, U. S. Fish Commission steamer Albatross (Cat. No. 25265). 
b. Species having no sujmtnrlyUal spine. 
SPIRONTOCARIS FLEXA. 
Very near S. g/^acilis (Stimpson); differs chiefly in longer basal scale 
of antcnnula, reaching a little beyond first segment, in lower position 
of pter^^gostomian spine, in the presence of epipods on the maxilliped 
and first two pairs of feet. 
Dimensions.^Female., length 5-i mm., of carapace and rostrum 20 
mm., of rostrum 11.5 mm. 
Type locality. — North of Bird Island, Shumagins, Alaska, 21 fathoms, 
station 2850, U. S. Fish Commission steamer Albatross (Cat. No. 25266). 
Distrihution. — From Bering Sea to Drakes Baj', California, 10 to 
93 fathoms. 
SPIRONTOCARIS DECORA. 
Rostrum longer than carapace, 4 to 5 superior teeth (1 to 2 on 
carapace), anterior tooth in front of middle of rostrum; rostrum less 
slender than in S. (/racills or S. Jiexa., a little concave above, nearly 
horizontal; 6 to 8 teeth below. Maxilliped without exognath, but 
with an epipod; no epipods on feet. Posterior margin of third 
al)dominal segment strongly produced at the middle, but the segment 
is not laterally pinched or carinated; sixth segment longer than 
seventh. 
Dhnensions. — Female, approximate length -17 mm., length of cara- 
pace and rostrum 16.1: mm., of rostrum 9 mm. 
Tyi)e locality. — Oft' Santa Cruz Island, California, 150 fathoms, 
station 2916, U. S. Fish Commission ati^^mQv Alhatross (Cat. No. 25267). 
Distrihution. — From Straits of Fuca to San Diego, California, 50 
to 171 fathoms. 
SPIRONTOCARIS TRIDENS. 
Allied to S. gracilis., S. flexa, and S. decora., but stouter. Superior 
teeth 3, 1 on carapace and 2 at base of rostrum; inferior 3 to 6. Basal 
scale of antennules with a spine which extends nearly to end of second 
segment. Acicle, measured along its outer margin, a little shorter 
than carapace. Third abdominal somite well produced backward and 
