308 EOCENE MOLLUSCA. 
This species approaches nearly to P. granata ; but the depressed and deeply con- 
cave margins and rounded shoulders of the whorls give a peculiar character, by which 
it may readily be distinguished. It also presents a close resemblance to a Pleurotoma 
from the upper and middle Eocene deposits of Germany, figured by Beyrich (‘Die 
Conchylien des norddeutschen Tertitirgebirges, tab. xxix, fig. 4); but descriptions by 
that author of the Pleurotome figured by him have not been yet published, and 
without them, or a comparison of the shells themselves, it is unsafe to express any 
opinion as to the identity of the two species. 
Size—Axis, 11-12ths of an inch, nearly; diameter, rather more than 4-12ths of 
an inch. 
Localities.—Highgate, Potter’s Bar, Chalk Farm. 
No. 234. Pievroroma cranata. F. 2. Hdwards. Tab. XXXI, fig. 7, a—c. 
P. testa oblongo-fusiformi, turritd, undique transversim granoso-lineatd : anfractibus 
depresso-conveais, ad humeros obtuse carinatis, noduloso-crenatis ; marginibus posticis latis, 
profunde cavatis, ad suturam incrassatis, lineatis, plicatis ; ultimo anfractu antice sub- 
conico, in canali lato, brevi, desinente; lineis transversis supra margines et humeros 
anfractuum exilibus, numerosis, regularibus ; supra medias partes crassioribus, inequalibus, 
lineis majoribus minoribusque alternantibus ; omnino liners incrementi elegantissime granu- 
latis: apertura ob-ovatd ; labro tenui, valde arcuato ; sinu lato, mediocriter profundo, ad 
humerum collocato ; columella contortd, callosd. 
A broad, fusiform shell, the whole surface of which is beautifully ornamented with 
finely granulated, concentric, raised lines; the spire, formed of five or six volutions 
exclusive of the pullus, is turreted, pointed, and moderately elevated, not quite 
equalling the aperture in length. The whorls are bluntly and obscurely keeled round 
the shoulders, on which they present a series of rather closely set, oblong, obliquely 
curved plications, variable in size in different specimens, and frequently lost on the 
last whorl; the posterior margins are wide, embracing the preceding whorls nearly 
up to the shoulders, deeply channeled, thickened and fineiy plicated round the suture, 
where, occasionally, they are girt with one or two raised lines more prominent than the 
rest. The suture itself is deep and very perspicuous, owing to the great width of the 
margin of the whorl. The last whorl is flatly convex and much contracted towards the 
front, whence it tapers nearly regularly to the base, presenting somewhat of a conical 
form ; and the anterior canal is wide and short, but distinct. The concentric lines over 
the margins and shoulders of the whorl are numerous, regular, very slender, and thread- 
like ; over the middle and front parts they are thicker and more prominent, closely set, 
and unequal, larger lines alternating with smaller ones ; all are very regularly and closely 
granulated by the lines of growth. The aperture is of a wide, oval form ; the outer lip 
thin and sharp on the edge, and much arched ; the sinus, which is wide, moderately 
