S. I. Smith — Crustaceans of the Atlantic Coast. 
45 
H. coarctatus but describes a new species, latifrons , as common in 
Bering Sea, apparently using the same specimens which were a few 
months before referred to II. coarctatus. II. latifrons , though closely 
allied to coarctatus , is certainly a good species, or a very remarkable 
variety, and quite distinct from Brandt’s variety alutaceus. The 
occurrence of the true coarctatus in the arctic region west of America 
is therefore left doubtful. 
This species apparently furnishes an important part of the food of 
the cod. 
Libinia emarginata Leach. 
Libinia emarginata Leach, Zoological Miscellany, ii, p. 130, pi. 108, 1815. 
Libinia canaliculata Say, Journal Acad. Nat. Sci. Philadelphia, i, p. 77, pi. 4, fig. 1, 
1817. 
Not uncommon in the shallow parts of Casco Bay ! where pro- 
tected from the cold outside waters, 1873. More common in Massa- 
chusetts ! and Cape Cod! (1875) Bays. Abundant in Vineyard 
Sound! and Buzzard’s Bay!, 1871, 1875, and south to Key West !, 
Florida, (Gibbes), Nassau !, New Providence (Dr. Edward Palmer), 
and the west coast of Florida! (Col. E. Jewett). 
It is a strictly shallow-water species, probably never occurring 
below ten fathoms, and appears to delight in muddy bays and inlets 
where the water is slightly brackish, though it often lives in pure 
sea-water and in exposed situations. 
Leach’s name emarginata takes precedence of Say’s canaliculata. 
Leach states that “the locality of this species, which is the only one 
of the genus which has yet been observed, is unknown.” A careful 
examination of his figure (which represents a female with the carapax 
about 65 millimeters long) convinces me of the certainty of the iden- 
tity of his species with that of Say. White (List of Crust, in British 
M useum, p. 4) doubtfully retains the two species, although he places 
two males from Boston, JT. S., under emarginata with Leach’s type. 
The variation due to sex and age are very marked, and both Milne- 
Edwards and White probably failed to unite the species from want 
of a good series of specimens. Although Say mentions Leach’s 
figure he evidently compared it with males of Ids species, from which 
alone his description was apparently taken. 
Lithodes maia Leach ex LinnA 
Off Cape Ann !, Massachusetts, 1875 (received from fishermen). 
Casco Bay! (Museum Yale College, received from A. S. Packard, Jr.) 
Cashe’s Ledge J, Gulf of Maine, 52 to 90 fathoms, rocky, 1873, In 
