97 
place with much doubt of the propriety of thus disposing of them. 
The fossil, Plate VII. Fig. 8, is from Shepey : some, still larger, are 
found at Bognor. Its spiral turns are placed partly one on the other, 
so as to form a nearly smooth convex upper and concave under surface : 
the turns themselves being nearly round, and beset with slight longitu- 
dinal ridges. The last turn of this fossil is very much produced, and 
terminates in a round distinctly bordered aperture. 
The produced or extended turn of these and the preceding fossils, 
with the completely round and distinctly marginated mouth, have in- 
duced me to place them together : and, in consequence of the peculiar 
organization of the rugous part of the species, Fig. 11, I have no 
hesitation in considering it as an adherent shell, and of placing it among 
the serpulae. 
But with respect to the other two species, agreeing as they do with 
this fossil, as to their peculiar termination, I must acknowledge that I 
have no reason for supposing them to have been adherent shells. I have 
however ventured to assume this situation for them, until more correct 
observations shall allot them one more appropriate. 
LXXI . Siliquaria. A tubular shell , spiral at its beginning, continued 
in an irregular form ; being divided laterally, through its whole length, 
by a narrow slit, and formed into chambers by entire septa. 
This is Serpula anguina, Linn. Rmnpf. Tah. xli. Lit. n. Baron 
Born has figured, Born. Mus. Cces. T. 18, Fig . 16, two species, or, 
according to Linnaeus, two varieties, of this shell, one of which is very 
strongly muricated. The animal itself is not known. 
This shell is found frequently fossil at Grignon. M. Faujas observes, 
that these fossils have, on their outer surface, many rows of small pro- 
tuberant striae, which are more or less rough, and which run the length- 
ways of the shell. A narrow slit, more or less open, runs along the 
whole of the circumvolutions in some specimens ; whilst in others its 
place is supplied by small narrow openings, separated from each other 
j) y intercepting points. This naturalist has discovered that these fossil 
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