182 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



the shape of the scaphocerite. In septemspinosa this scale is narrower 

 at its distal end and the margin of this rounded part slopes backward 

 from the inner angle, while in C. vulgaris this same margin is convex 

 and tends to slope forward towards the inner angle. In septemspinosa 

 the distal spine of the scaphocerite is as long or longer than the distal 

 margin of the rounded portion. 



Distribution : Known from the eastern coast of North America 

 from eastern Florida northward to south Greenland and from the 

 Arctic coast of Alaska at Eschscholtz Bay, southward along the east- 

 ern coast of Bering Sea to the Shumagin Islands. 



Material examined: Three specimens dredged in Beaver Harbor, 

 Nova Scotia, September 10, 1926. 



Technical description: Carapace short and wide; abdomen two 

 and three-fifths times as long as carapace, very robust. Rostrum 

 short, not extending as far forward as the eye, tongue-like, with the 

 apex rounded and the upper surface concave, the margin continuous 

 posteriorly with that of the orbit and midway behind the eye con- 

 tinuous with a ridge which curves outward and then runs backward 

 three-fourths the length of the carapace. The postorbital spine is 

 acute, triangulate, upward-directed slightly, but closely appressed to 

 the eye. The pterygostomian spine is rather large, triangulate, for- 

 ward-directed. There are three other spines on the carapace, one in 

 the median line of the mesogastric region, small, acute, upward and 

 forward-directed, and in line with this a similar spine on either side 

 in the midlateral region, the hepatic spine ; there is a slight oblique 

 carina running from the anterior base of the hepatic spine to the 

 lower side of the suborbital spine. 



The first and second abdominal segments are wide, of equal length, 

 each being 4 mm. long, with the pleura but little produced ; the 

 pleura of the first segment have the margin concave above the leg 

 and rounded at the corner angles, the posterior angle being convex 

 and slightly produced posteriorly; the second pleura are produced 

 into a convex flap anteriorly and posteriorly, overlapping the adjacent 

 segments, and with the outer margin slightly concave above the leg; 

 the third segment is nearly as long in the median line as the first two 

 taken together, being 7.5 mm. long, with the lateral margin convex, 

 overlapping the fourth segment; the fourth segment is only 3.5 mm. 

 long with the pleural margin convex and ciliate ; the fifth segment is 

 5 mm. long, with the posterior median margin straight, a small notch 

 at the base of the pleural margin, which latter is directed obliquely 



