On Schizoporella Ridleyi and §. simplex. 215 
timber, &c., in the diffusion of the species, apart from the 
general laws which preside over the distribution of life. 
Further light will no doubt be thrown on the relations of 
the Polyzoan fauna of the Islands when we know more of the 
history of the group of new forms recorded in this Report. 
We may venture, I think, to say, that they are not to any 
large extent Arctic. Are they southern coast-line emigrants, 
or do they occupy their original home ? 
EXPLANATION OF PLATE IX. 
Fig. 1. ? Porella argentea, n. sp. 
Fig. 2. Schizoporella torquata (D’Orbigny), Lamx. 
Fig. 3. Cellepora? n.sp. (brunnea); a cluster of zocecia, showing one of 
the marginal decumbent cells. 
Fig. 4. Lagenipora spinulosa, n. sp.; erect form, nat. size. 
Fig. 5. Tubulipora Dawsoni, n. sp., nat. size. 5a. Portions of the stem 
showing the offsets from the dorsal surface, by which the zoa- 
rium is attached. 66. Portion of a branch, showing the dispo- 
sition of the zocecia. 5c¢. The extremity of a branch, showing 
the cellular capitulum and several of the scattered central 
zocecia. 
Fig. 6. Tubulipora fasciculifera, n. sp.; portion of the zoarium, showing 
the arrangement of the zocecia. 6a. A colony, nat. size. 
1g. 7. Cellaria mandibulata, n. sp.; avicularian cell. 7a. Nat. size, 
showing a peculiarity in the ramification. 
Fig. 8. Menipea compacta, n. sp.; front view of an internode. 8a, 
Dorsal surface. 
XXV.—On Schizoporella Ridleyi, MacG., and Schizopo- 
rella simplex, D’ Orbigny and Johnston. By J. J. QuELCH, 
B.Se. Lond., Zoological Department, British Museum. 
THE Schizoporella Ridleyi, MacGillivray, was orignally de- 
scribed as S. marsuptum by Mr. Ridley, who identified it 
with Lepralia marsupium, MacG., having been misled by the 
short and incomplete description of this species, which was, 
moreover, as stated since by Mr. MacGillivray, drawn up 
from a bad specimen. And certainly, if excuse were needed 
for such an identification, | may state that the agreement 
between the type specimen of the ‘ Alert’ collection described 
by Mr. Ridley, and the description and figures of L. marsu- 
ptum given by Mr. MacGillivray in the Prodr. Zool. Vict. 
decade iv., seems to me much closer than is the agreement 
between the figures given since by Mr. MacGillivray (Roy. 
Soc. Vict. 1882) for Porella (Lepralia) marsupium and his 
previous description and figures of the same species. 
The ‘ Alert’ species, being found by Mr. MacGillivray to 
