DECAPODS 67 
to miles west of Point Franklin, 1314 fathoms, 3 ¢ (Point Barrow Expe- 
dition). 
Off ae Sabine, 12 fathoms, 1 2 (W. H. Dall). 
15 miles off Cape Krusenstern, 14 fathoms, 1 9 (W. H. Dall). 
Rakovaya Bay, Avacha Bay, Kamchatka, 1 2 (Adbatross). 
Off Robben Island, east coast of Sakhalin, Okhotsk Sea, 28 fathoms, 
I ovigerous 9 , type (A/batross station 3650). 
The species differs from S. “/jeborgii in its lower carapace, shorter (in 
the  ) and less ascending rostrum, smaller eyes, shorter spine of antennal 
scale (in S. “deborgii the spine extends considerably beyond the blade), 
longer dactyli of third to fifth pairs of feet, longer abdomen, and stouter 
sixth segment. From S. spina it differs in the lower carapace and less 
ascending rostrum, in the lesser advancement of the lower limb of the 
rostrum, smaller eyes, shorter spine of scale, shorter and broader lobe of 
third abdominal segment, which is not carinated, longer dactyli of third 
to fifth pairs of feet (in S. sfzvza the dactylus of the fifth pair is only one 
third length of propodus). 
SPIRONTOCARIS TRUNCATA Rathbun. 
Spirontocaris truncata RATHBUN, Proc. U. S. Nat. Mus., XXIV, 894, 1902. 
Allied to S. spina. Median carina extending nearly to the posterior 
margin of the carapace, convex, and armed with 4 spines. Rostrum sub- 
triangular, widest at the extremity, about three fifths 
as long as the carapace, reaching end of second 
antennular segment, midrib curving upward as in 
S. spina, Upper margin with 1 spine at its middle, 
extremity with 7 spines, 2 above and 4 below the 
midrib. Supraorbital spines 2, equal, large, one ete le ee 
behind the other but scarcely above it, well sepa- (*°# Station 286. 
rated. Anterior margin with 2 spines below the orbit as in S. spina. 
Antennular acicle reaching beyond the anterior margin of the second 
segment but not so far as the slender spine at the outer angle of that 
margin; a small spine at the middle of the anterior margin of the third 
segment. Antennal acicle tapering, narrow at the end, reaching one 
third the length of the thick antennular flagellum. Peduncle reaching 
beyond first segment of antennular peduncle; flagellum two thirds as 
long as body. 
Maxillipeds reaching end of antennal scale; first pair of feet to end of 
antennal peduncle. The propodi of the third, fourth, and fifth pairs are 
three times as long as their dactyli. 
Margins of first to third abdominal segments entire; of fourth to sixth 
Ss = 
—_ 
= J 
