and a new genus Conchicolites. 208 
aperture. This species may be recognized, not only by its great 
size and by the thickness of the investing tube, but by the fact 
that the external surface of the tube is covered with very 
numerous and fine longitudinal strie, communicating to the 
fossil something of the aspect of a cora 
Recently, several specimens of a new fossil have come under 
my notice, which I at first referred to Cornulites, but which I 
ain now disposed to place, provisionally at any rate, in a new 
genus, under the name of Conchicolites, under the specific title 
of C. gregarius. From their peculiar mode of occurrence, these 
fossils are of considerable interest, and no doubt can be enter- 
tained as to their being truly the remains of tubicolar annelides. 
Conchicolites gregarius occurs in b 
the form of small clustered tubes 
(fig. 2), generally slightly curved, 
pering towards one end, an 
attached by their smaller extrem- 
thes to some foreign body. Most [ 
of the specimens in my possession [ 
occur attached in great numbers 
to the dead shells of Orthocerata 
ood v . . 
tesembled in its habits the mod- garius. Natural size. Only the mouths 
= Serp ulae, and its zoological of the tubes are visible in this speci- 
affinities are altogether beyond men. 0. Cast of the tube of another 
doubt. specimen of the same. 
All of my specimens, which show more than the mouths of 
the tubes, are in the state of casts; and I am unable to sp 
Positively as to the characters of the tube itself, except from one 
or two fragmentary examples. The disappearance, In some 
cases, of the walls, leaving merely the internal casts, renders it 
tolerably certain that the tubes were calcareous. 1t is also to 
be regretted that the materials at present in my hands do not 
render it possible to determine the presence or absence of the 
cellular structure which is so conspicuous in 
rius. In the specimens growing on Orthocerata, 
Where the Orthoceras is broken C 
to get a view of the surfaces of the tubes. Owing, however, 
