DECAPODS 123 
Dimensions.—Length of female (A/satross station 3504) from tip of 
rostrum to tip of telson 45 mm.; length of carapace 12 mm.; length of 
antennal scale 6 mm. 
Distribution.— Bering Sea and Aleutian Islands, 21-g1 fathoms, at 
31 stations of the Albarross; also off Vancouver Island, at 1 station in 
24 fathoms; off coast of Kamchatka, 39-100 fathoms, at stations 3643 
and 3781; usually in small numbers. Also taken by Dr. W. H. Dall 
at 6 stations between Adak and Kadiak, in 9-60 fathoms. Bering Island 
(N. Grebnitzky). 
CRANGON COMMUNIS Rathbun. 
Crangon communis RATHBUN, The Fur Seals and Fur-Seal Islands of the 
North Pacific Ocean, Pt. III, 556, 1899. 
Carapace about a third as long as the abdomen; furnished with a 
median carina on the anterior half, which is armed with two spines, both 
in front of the middle; the posterior of these spines is the larger. The 
rostrum is slender, tapering, ascending, hav- 
ing a median sulcus, tip rounded, not extend- () (S) 
ing beyond the eyes. A lateral spine nearly , 
in line with the anterior of the median spines ; ' 
two large spines on the anterior margin of the A 
carapace, one of which is at the outer angle i es 
of the orbit, and the other at the antero-lateral = c d 
angle. Fic. 64. Crangon communis. @. 
Station 3611. @. Dorsal view of ante- 
The first segment of the antennular peduncle rior part of carapace (x 2). 4. Side 
: view (x 2). c. Acicle (xX 2). @. 
extends beyond the eyes to a distance exceed- Chela (x 23). 
ing the length of the last two segments; the second segment is about 
twice as long as the third. The antennal scale is elongate, about two 
thirds the length of the carapace; the spine is slender and exceeds the 
blade. The outer maxillipeds are very slender and extend slightly be- 
yond the scale. The first pair of feet may not quite reach the scale or 
may extend beyond it; the merus has an outer distal spine; the manus 
is over three times as long as its average width; the immovable digit is 
long and slender, and the dactylus when flexed is obliquely transverse. 
The sternum has a series of median tubercles. 
The abdomen is smoothly sculptured; there is a blunt median carina 
on the third to fifth segments; the first and second segments have a 
transverse sulcus; the third and fourth segments have each two trans- 
verse sulci, which are connected either side of the median carina; the 
sixth segment is furnished with two prominent longitudinal carine, a 
median sulcus, and a sulcus on the outer side of each carina; the seventh 
