Botany and Zoology. 143 
species, their soft parts, and embryonic forms, in the family Unionide. 
Read before the Academy of Natural Sciences of Philadelphia, and pub- 
lished in their Journal; by Isaac Lea, LL.D., President of the Academy 
of Natural Sciences of Philadelphia, &¢.—Memoirs so elaborate and val- 
uable to science as those of Mr. Lea demand a more extended notice 
than our pages will permit. We can do little more than call the atten- 
tion of those interested. to the great results of his untiring labors in the 
department of recent Conchology. It is well known to the scientific 
World that Mr. Lea has been, for many years, devoting a large portion of 
his time to the elaboration of the Unionide, a family of freshwater Mol- 
lusks, Up to this time the results of his labors are embodied in 8 vols. 
to, with a considerable number of finely executed plates. We have now: 
Vols. vii. and viii, of 2 parts each, before us. 
Vol. vii, part 1 consists of 51 pages of text and 12 plates, with elab- 
P 
: old species not before examined anatomically. “The descriptions and 
res of the soft parts, in this paper, will be found to be important. 
Will also attract the attention of the zoologist. 
Vy new species, and is illustrated with 16 plates. : 
ol. viii, part 2, contains 58 pages of text and 18 plates, with descrip- 
58 new species, all of which are indigenous to this country. From 
descriptions and remarks upon most of them. The Southern States, and 
Particulariy Alabama, Mississippi, Georgia and North Carolina have mul- 
9 them greatly. The very ssuiarenbls diffusion of species of this 
Md of zoological life in so many varied forms, some of them so near! 
allied, will strike the attention of the student; for no other portion of the 
