274 
rather below the middle of the volution; the outer wall has a 
large conical acute fold at the middle of the volution; the 
slight fold referred to on the upper portion of the volution is 
doubtful. 
Locality.—Tiltup’s End, near Nailsworth, in the White 
Limestone (Great Oolite.) 
NV. Colemrom 7 Nerrxma| snrnpx, 9 : » SBe | PL. IV., fig. 4, 4a. 
Te pv % 
obec Shell smooth, conico-cylindrical ; whorls flat, numerous, the 
pee height equal to two-thirds of the diameter, sutures moderately 
deep; columella perforated ; outer wall with one small mesial 
fold; there is also a small fold in the posterior wall. 
This shell is closely allied to Nerinea gracilis, Lyc., but is 
more conical, the whorls are much greater in diameter as com- 
pared with their height, the fold on the posterior wall also . 
distinguishes it from that species. 
Locality.—Tiltup’s End, Nailsworth, in the White Limestone 
(Great Oolite.) 
NERIN#ZA INTERMEDIA, n. sp. PI. IV., fig. 5, 5a, and Pl. V. 
fig. 1, la. 
Shell conical, volutions smooth, flat, suture slightly shown ; 
aperture elongated, terminating in a channel, which is some- 
what lengthened and curved backward; columella perforated, 
having one acute conical fold anterior to the middle of the 
volution ; on the wall one deep blunted fold; on the posterior 
wall one deep acute fold. Length of adult specimen four to 
five inches. 
Although specimens of this shell are exceedingly numerous ; 
in the Nerinea bed, it is difficult to obtain them otherwise than } 
in fragments, and the best examples are somewhat worn on the 
surface, and are not sufficiently well preserved to enable me 
fully to show the external character of the species. | 
Locality.—Tiltup’s End, near Nailsworth, in the Nerinea 
bed, between the Great Oolite and Forest Marble—abundant. 
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