Geology and Natural History. 161 
specimens referred to the latter species, may be due to sex, for 
the sexes differ considerably in these characters in all known 
cuttle-fishes. 
have been made by different photographie printing processes, di- 
e 0 
rectly from photographs of the specimens, and ar unrivalled 
= ; 
detailed descriptions of all the known species, except those of the 
east coast of North America, which were described in Part ii, 
uch species are, however, referred to, in their proper systematic 
places. Twenty-eight plates illustrate Part iii; the remaining 
Seventeen relate to structure and belong to Part iv, but are issued 
in advance of the text, owing to the loss of the MSS., drawings, 
rs some of the plates, by the great Boston fire, in November, 
. A. KE. V. 
20. The Marine Mammals of the Northwestern Coast of North 
America, described and illustrated, together with an account of 
the American Whalefishery ; vy Cuartes M. Scammon, Captain 
U.S. Revenue Marine. San Francisco: John H Carmany & C 
4to.—The advance copies of the plates of this work, that we have 
Seen, are highly satisfactory, and considering the well known ability 
and enthusiasm of the author, we anticipate that the book, when 
completed, will be a valuable contribution to science, m a depart- 
£ 
graphic plates, and is offered to subscribers at the very low cost 
of ten dollars. : 
l. Embry by E. 8. Morse. | 
memoirs of the Boston Society of Natural History, vol. ti, p. 249- 
264, 4to, with two steel plates. December, 1573.— longer no- 
on Lurope ; mitH.—Th nee of Mysis relicta 
Lovén and Pontoporeia affinis Lindstrom in Lakes Superior a 
ichigan has already been alluded to in this Journal ( vol. ii, pp- 
the Superintendent of the Lake Survey, I have found three Ped 
of Cladocera which I cannot distinguish from species , 
from the lakes of northern Europe. Daphnia galeata G. O. Sars 
