S. J. Smith — Crustaceans of the Atlantic Coast. 45 



ff. coat'ctatus bat describes a new species, lattfrons, as common in 

 Bering Sea, apparently using the same specimens which were a few 

 months before referred to H. coarctatus. H. 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 canaliculaia 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 luiknown." 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 

 Museum, p. 4) doubtfully retains the two species, although he places 

 two males from Boston, \J. 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 his species, from which 

 alone his description was apparently taken. 



Lithodes mala Leach ex Linne. 



Off Cape Ann !, Massachusetts, 1875 (received from fishermen). 

 Casco Bay! (Museum Yale College, received from A. S. Packard, Jr.) 

 Cashe's Ledge!, Gulf of Maine, 52 to 90 fathoms, rocky, 1873, In 



