Zoology. 275 
been often collected by Prof. Agassiz. The polyp of the oa 
is still unknown : but we have here the suggestion, with some good 
reasons for admitting its correctness, fon itisa Tubularia, a are spe- 
cies of which is well known in the s bor. 
Many — sea are detailed in hi memoir which we have to pass 
by at this 
Besides fe: species mentioned as described in this paper, the author 
briefly mentions two new species ua Meeks (T. diaphana and 
tT. pilosella) ; and also a new genus r Hippocrene which he calls 
Nemopsis, in allusion to the fact han a of the eye-specks of each 
cluster have a slender pedicel instead of being sessile like the others 
near the bases of the tentacles. The p sae! was taken in Nantucket 
Harbor, June, 1849, and is named N. Bache ie 
2. On the Structure of Nummulina ; by W . B. Carpenter, M.D., 
F.R.S., (Qua Geol. Soc., No. 21, Feb. 1, 1850. )—In this elabo- 
rate and well A acct memoir, Mr. Carpenter sustains the opinion 
that the Nummulites are true Foraminifera. e succession of cells 
in a spiral order was pointed out by D’Orbigny as favoring this view. 
Carpenter remarks also that the cells or chambers are not even and 
be covered with as as many layers of ell above and below its own Fee 
and floor, as thereare, chambers intervening between it and the 
wit 
thus formed in section nto be « 
oaaed by Motions white linés,- wtih si em: to. indicate a Netviton of. 
he fis mber tof tubes of" f irre: af for mi, probe argo: 
Nadie » bei 5 | - s 
ear, 
+ 
