58 S. I. Smith — C'rustaceans of the Atlantic Coast. 



septemcarinata^ from tlie coast of Norway, and I have myself recorded, 

 under the same name, specimens of the second species, taken by Mr. 

 Harger and myself upon Le Have and 8t. George's Banks in 1872. 



Of the septemcarinata there are over one hundred specimens before 

 me, and all of them agi'ee very closely in the form of the rostrum and 

 telson, and in the armament and sculpturing of the carapax and 

 abdomen. The rostrum is nearly horizontal, scarcely overreaches the 

 eyes when they are directed forward, is obtusely rounded at the 

 extremity as seen from above, and has a median dorsal carina which 

 is most prominent near the tip. The dorsal carina of the carapax is 

 well marked, but the teeth with which it is armed are not very 

 prominent and in none of the specimens are there more than five in all. 

 Of these spines the anterior is minute and scarcely forms a part of 

 the carina, the second, third and fourth are about equal in size, while 

 the fifth is smaller and very near the posterior mai-gin, or wholly 

 wanting in some of the smaller specimens. The subdorsal carinse are 

 distinct and irregularly dentate posteriorly, but on the anterior third 

 of the carapax are faintly indicated and not at all, or only very 

 obscurely, dentate. The superior lateral carinse terminate anteriorly 

 in a short tooth at the outer angle of the orbit but are not distinctly 

 dentate near the anterior border of the carapax. The inferior lateral 

 carinse are strongly dentate anteriorly but posteriorly the teeth 

 become very small or even obsolete. 



The telson falls considerably short of, or reaches nearly to the tips 

 of, the inner lamellae of the uropods. Its extremity is truncated, — 

 or rather terminates in a very obtuse and rounded angle, — and is 

 usually armed with ten to fourteen slender spines or spiniform setae. 

 This armament of the tip of the telson is subject to considerable varia- 

 tion, apparently for the most part due to wear or to accidental injuries 

 of various kinds ; but there seems to be no approach to the structure 

 in the next species. The number of spines varies slightly in difierent 

 specimens but consists regularly of an even number — there being no 

 median spine, — those cases where there is an odd number being appar- 

 ently the result of accident. In small specimens which are very little 

 worn, the spines are slender and vary much in length, the outer ones 

 being short while those toward the center are very long, often fully 

 equal in length to the breadth of the extremity of the telson, and 

 ciliated toward their tips. This perfect form of armament is well 

 shown in the specimen of a male figured (Plate XI, figure 10) and, in 

 the specimens examined, seems to be more common among the males, 

 although some of the young females have it in nearly as great per- 



