‘ 
10 CHEBUCTO NULLIPORES—HONEYMAN. 
There is another interesting nullipore to which I would 
direct attention. This, also, was dredged at the mouth of 
Halifax harbour. It is decidedly lamellar. Broken in two it 
shows a concretionary structure. On its surface is a considerable 
growth of the alow Ptilota serrata. Branches of this lying on the 
coralline become imbedded by the caleareous growth. Some of 
these having been removed, have left indented impressions in 
the same way as ferns, &c., leave their impressions in Carboni- 
ferous shales. Other attaches are numerous foramenifera ; 
many of these are lying in the algw. Others on the coralline 
are sometimes partially imbedded and covered by the growth of 
the former. It is possible that parts of the alga and others of 
the foramenifera are enveloped in the coralline in the manner of 
fossils. No part of this coralline, although of considerable size, is 
cespitose. This seems to show that the cespitose corallines are 
distinct from the lamellar. 
The under part is very striking. It is altogether separate 
from its original attachment, and seems to have been so for a 
considerable Jength of time. Several sawicava are imbedded, but 
all are dead. The valves of some have numerous smal] perfora- 
tions. The operators, doubtless, sueceeded in destroying the 
tenants. 
U 
Tubevculous annelids (worms) in great numbers adhere to 
the base and its cavities. The inmates have long gone. 
The tubes are of serpuiz, of, apparently, two species. One 
species has a singular head, or ending, while the other is plain, 
The ending has the form of a head, the opening having the 
appearanee of a circular mouth. Thisform is evidently not acci- 
dental, as several have it. 
Other tubes are spiral. Spirorbis of apparently three 
species. Some of these are attached to saxicava. 
Some of the hollows are lined with sponges. Among the 
tubes are numerous foramenifera. Other attaches are two or 
three pretty little anomia. 
