58 S. I. Smith — Crustaceans of the Atlantic Coast. 
septemcarinata, from the 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 St. George’s Banks in 1872. 
Of the septemcarinata there are over one hundred specimens before 
me, and all of them agree 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 iu size, while 
the fifth is smaller and very near the posterior margin, or wholly 
wanting in some of the smaller specimens. The subdorsal carirne 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 carinae 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 
carinae 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 iu different 
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- 
