S. I. Smith — Crustaceans of the Atlantic Coast. 107 
CUMACEA. 
The following account of the Cumacea is even more imperfect than 
the enumeration of the species of the groups treated above. No 
reference is made to a few small species, which are represented in 
the collections examined by young or imperfect specimens only. 
Several of the species were first very kindly determined for me several 
years ago by Professor G. O. Sars. 
Diastylis Rathkii Bate. 
Cuma Rathkii Kroyer, Naturbistorisk Tidsskrift, iii, pp. 513, 531, pis. 5, 6, figs. 
17-30, 1841 ( $ ) ; ibid., II, ii, pp. 145, 207, pi. 1, figs. 4 and 6, 1846 : in Gaimard, 
Voyages en Scandinavie, en Laponie, etc., pi. 5, fig. 1, 1849. — Liljeborg, (Efver- 
sight Kongl. Vetenskaps-Akad. Forhandlingar, Stockholm, 1852, p. 6. — Mobius. 
Die wirbellosen Thiere der Ostsee, Exped. 1871 auf Pommerania, p. 122, 1873. 
Cuma angulata Kroyer, Naturhistorisk Tidsskrift, II, ii, pp. 156, 206, pi. 2, fig. 1. 
1846; in Gaimard, op. cit., pi. 5, fig. 2, 1849 ( $ ). 
Diastylis Rathkii Bate, Annals and Magazine Nat. Hist., II, xvii, p. 451 (3), pi. 1 3 ? 
figs. 1-21, 1856. — G. 0. Sars, Christiania Videnskabs-Selskabs Forhandlinger, 
1864, p. 160; Om Cumaceer fra de store dybder i Nordishafvet, Kongl. Svenska 
Vetenskaps-Akad. Handlingar, Stockholm, xi, no. 6, p. 7, pi. 3, figs. 8-9, 1873; 
Archiv for Mathematik og Naturvidenskab, Kristiania, ii, p. 345, 1875. — Metzger, 
Jahresbericht der Comm, zur wissensch. IJntersuchung der deutschen Meere fur 
1872, 1873, Nordsee. p. 286, 1875. 
Alauna Goodsiri Packard, Memoirs Boston Soc. Nat. Hist., i, p. 301, 1867. (Not of 
Bell, in Belcher, Last of the Arctic Voyages in search of Sir John Franklin, ii, 
p. 403, pi. 34, fig. 2, 1855 ; though it is very probably the species mentioned by 
Bell as perhaps a form of his species and partially figured on the same plate, 
figure 3, with which figure Packard identified his specimens.) 
Off’ Halifax !, Nova Scotia, 1877 : 42 fathoms, fine sand, — five 
males, six females; 52 fathoms, fine sandy mud, — one male, seven 
females; 57 fathoms, gravel and stones, — one specimen. Also just 
off Chebucto Head !, Halifax, 1872, 20 fathoms, soft mud and fine 
sand, — young only. Gulf of St. Lawrence!, 1871, 1872, 1873 (Whit- 
eaves). Labrador ! (Packard). Greenland (Kroyer, Norman). North 
latitude 81°, east longitude 1°, 450 fathoms (G. O. Sars). British 
Isles! (Norman). Norway! (G. O. Sars). Baltic! (Mobius). 
In 1873 1 sent some of the specimens collected on the coast of 
Labrador by Prof. Packard, to Prof. G. O. Sars and he wrote me that 
they belonged to a new species, but I am unable to find any constant 
differences which will distinguish the specimens which still remain 
from Prof. Packard’s collection from European specimens of 1). 
Rathkii. Most of the specimens from Labrador have the sides of 
