THE 
NATURAL HISTORY REVIEW: 
A 
QUARTERLY JOURNAL OF BIOLOGICAL SCIENCE. 
Hettieurs. 
XLVIII.— Contributions to the Natural History of the 
United States of North America. By Louis Agassiz. 
Vol. IV. Boston, 1862. 
{Continued from page 359.) 
The fourth part of Professor Agassiz’ ‘ Second Monograph,’ is 
entirely devoted to the extensive order of Hydroidje, which, as we 
have shown, in his arrangement, includes — 
1. The Hydroida of Johnston and others. 
2. The Tabulate, Tubulose and Rugose Corals; and, 
3. The Siplwnophora. 
In the chapters which treat of the Hydroid Zoophytes, usually so 
called, various forms are described belonging to the groups Tubularina 
and Sertularina of Ehrenberg, together with their proper allies, the 
Cryptocarpoe .* 
Of Tubularina , or Corynidce , Professor Agassiz notices not less 
than twelve genera. Most of these are already known, but the 
species here elucidated appear, with some few exceptions, to be re¬ 
presentatives of those which occur on the eastern shores of the North 
Atlantic. They are as follows :■— 
a. Coryne mirabilis. 
b. Clava leptostyla. 
c. Rhizogeton fusiformis. 
d. Hydractinia polyclina. 
e. Halocharis spiralis. 
f. Hybocodon prolifer. 
g. Rarypha crocea. 
h. Tubularia Couthouyi. 
* See Natural History Review, 1863, p. 352. 
N. H.R.—1863. 2K 
