260 EOCENE MOLLUSCA. 
shells from that locality ; and I am strongly inclined to think that by one of those 
accidents, which the greatest care will not always prevent, a shell from the Miocene 
beds of Germany or Italy has been mixed with Hampshire fossils, and that thus an 
erroneous locality has been given. The matrix, unfortunately, has been entirely 
removed, and this evidence is not available. Under these circumstances, I retain 
the species, for the present, as one of the English Eocene Pleurotome, but with 
niuch doubt. 
Stze—Axis, 13 inch; diameter, 4-12ths of an inch. 
Locality. —Muddiford ? 
No. 181. Prevroroma noputosa. JLamk. Tab. XXIX, fig. 7, a—c. 
PievrotoMa NopDuLosA. Lamk. 1804. Ann. du Mus., vol. iii, p. 170, No. 18. 
= — — 1822. Histoire Naturelle, &c., vol. vii, p. 101, No. 25. 
— — Desh. 1824-37. Deser. des Coq. foss., &e., vol. ii, p. 466, 
t. 65, fig. 1I—14. 
P. testé elongata, fusiformi, undique spiraliter lineatd: spird elevatd, acuminata : 
anfractibus ad humeros angulatis, nodulosis ; lineis filiformibus, sub-regularibus ; nodulis, 
obtusis, crassis, obliquis: ultimo anfractu per-brevi, postice concavo, antice depresso-convezo, 
repente coarctato, in canali brevi, latiusculo, obliquo, terminanti: aperturd oblongo-ovalt ; 
labro tenue, aliforme ; sinu latiusculo, paullo profundo, in margine collocato. 
Shell elongated, fusiform, having the whole surface covered with concentric raised 
lines : spire pointed, produced, much exceeding the aperture in length ; whorls angulated 
at the shoulders, where they present a series of blunt, thickish, rather oblong, tubercles, 
somewhat distant from each other, very slightly oblique, and becoming feeble and 
obscure on the last whorl; the posterior margins are a little concave. The last whorl 
is very short, flatly convex at the sides, contracted rather suddenly in front, and termi- 
nates in a short, and somewhat wide canal. The spiral lines are thickish, rounded, 
thread-like, equal, and nearly regular ; the aperture is of an oblong-oval shape; the 
outer lip thin, wing-like, projecting at the middle, and smooth within ; and the sinus, 
which is placed in the margin, is rather wide, not very deep, and triangular in form. 
Lamarck describes the concentric lines which ornament the French shells as very 
thin; while in the English specimens the lineation is strong and coarse. This 
difference in the character of the sculpture on the Eocene shells of the two countries is 
not of unfrequent occurrence, and may be attributed to outward conditions only. 
The sinus in the outer lip is described by Deshayes as being “narrow and deep ;” 
but in a series of specimens from Grignon, for which I am indebted to that gentle- 
man, the sinus corresponds pretty closely with that found in the English specimens. 
