S. I. jSmith — Crustaceans of the Atlantic Coast. 49 



much smaller and more crowded on both chelipeds in Kroyeri than 

 in pubescens. In Kroyeri the outer or left hand edge of the propodus 

 of the smaller cheliped, as seen from above, is distinctly incurved near 

 the base of the digital portion, while in pubescens the corresponding 

 edge is full and regularly, though not strongly, arcuate, so that the 

 digital portion of the propodus is much wider toward the base than in 

 Kroyeri. In Kroyeri the dorsal carina of the propodus of the smaller 

 cheliped is much nearer the right side toward the base than in pubes- 

 cens, is very high and sharply prominent, and surmounted by a single 

 series of dentiform teeth ; the narrow space beneath the carina to the 

 right is nearly or quite destitute of spines or tubercles ; and the outer 

 surface, or that to the left of the carina, is flat or slightly concave, 

 and covered with very small tubercles. In pubescens the carina is 

 low, obtuse and armed with a crest of spines which becomes a double 

 series proximally ; and the outer surface is slightly convex and is 

 armed with scattered spiniform tubercles. 



Kroyer's figure in Gaimard's Voyages en Scandinavie, Crustaces, 

 plate ii, figure 1, evidently represents the Kroyeri, although the 

 tubercles upon the chelipeds are represented in the figures as a 

 little too large and more scattered than in any specimens I have 

 seen, but this is probably due to a slight and very natural inaccuracy 

 on the part of the artist or engraver; the original description of 

 Pagtirus pubescens (Naturhistorisk Tidsskrift, ii, p. 251, 1839), how- 

 ever, applies best to the other species, which Kroyer evidently had 

 before him when writing the first phrase of the diagnosis, " cephalo- 

 thoracis superficie dorsali pedibusque pilis flavis dense obsitis," which 

 would not apply to any specimens of Kroyeri or to his figure pub- 

 lished ten years after. Kroyer mentions having numerous specimens 

 from difierent places on the Greenland coast and from Iceland, and 

 it is probable, as Stimpson suggests, that he failed to distinguish the 

 two species, as nearly all carcinologists have done since. 



While having a geographical range similar to the pubescens, the 

 Kroyeri is apparently a more strictly arctic species, and, upon the 

 New England coast, is most common in deep water and uj^on the 

 olFshoi'e banks. 



Stellwagen's Bank !, 29 to 44 fathoms, rocky and sandy, 1873, com- 

 mon. Massachusetts Bay !, ofi" Salem, 43 and 50 fathoms, mud, 1877. 

 Casco Bay !, 8 to 30 fathoms, rocky, spongy and sandy bottoms, and 

 occasionally on muddy bottoms also, 1873. Bay of Fundy !, 1864, 

 1868, 18 70, 1872, in similar situations as in Casco Bay, and more 

 common and of larger size; in 1872, it was also dredged oif Head 



Trans. Conn. Acad., Yol. V. 7 January, 1879. 



