REVIEWS. 489 
being evidently lines of veis sr The e of formation seems to be this: The crab when 
very young, selects a very small fragm sorta of shell or pebbles, bere it here upon its back 
by its posterior claws, as other species of Crabs (Hypoconcha) do, -— f Pecten, or some 
other bivalve shell. Upon this small she elly, or epus: Popes elio ei eie ng Caneris ocia 
finds a congenial sie but soon — mpi. af its — = a ae m rt 
"T depesiting i a "e, of horn-lil t 
peated, in proportion to its s own growth, and that of the crab jm 
car ries it. In this das there is soon fo ian a broad thin pellicle, having its concentric ele- 
aen» v. ranged around a nucleus of sto shell, which is usually excentric, the increase 
id in ps nt than be bind. This basal secretion is held upon the back of 
tiui by its recurved posterior legs, in the same manner as the original bit of shell.” 
The division of Corals he raises to the rank of an order, under the 
term Madreporaria, thus making it parallel with the Alcyonaria. Among 
these corals numerous new forms are described and figured. 
Cancrisocia expansa. 
A number of species from various parts of the world are added in a 
supplement. The geographical list shows that most of the species are 
from the Seas of East India and China, the South Seas, Cape of Good 
Hope, and the West Coast of America 
REVUE pes Cours ScrexTIFIQUES.* — This journal, now in its eighth 
year, is valuable as giving us reports of the olla: a of prominent scien- 
tists in Europe, and occasionally our own country. Late numbers contain 
lectures by Marey on the flight of birds and insects; by Agassiz and ra 
Academy relative to the qualifications of Ms. Darwin to be she 
member of that t body. Considering the bigotry and unstleniile spirit, to 
Say nothing of the surprisingly low grade of scientific acquirements dis- 
Played by some of the members, we should judge that if an opportunity 
Should offer Mr. Darwin would decline the honor (sic) of membership. 
* Edited by MM. Eug. and Yung Em. Alglave. 15 francs a year. 4to, eq im 15. as Each 
volume about 900 pages. Germer Balliere, 17 Rue de 'Ecole-de-Medicine, Pa 
AMER. NATURALIST, VOL. IV. 
