306 _ EOCENE MOLLUSCA. 
postice sulco spirali, ewilissime lineato, exaratis ; ad suturam duplici lined elevatd undulata 
marginatis ; ultimo anfractu in canali brevi, latiusculo, recurvo, desinente : lineis spirali- 
bus alternatim crassis et tenuissimis ; lineis crassis per-elevatis et per lineis incrementi 
granulatis : aperturdé ovali; labro leviter arcuato ; sinu lato, mediocriter profundo, sub- 
trigono, ad humerum collocato ; columella arcuatd, cristata. 
Shell elongate, fusiform, and ornamented with concentric, granulated, raised lines ; 
spire thick, nearly conical, and much produced, fully equalling three fifths of the entire 
shell in length. The whorls, eight exclusive of the pullus, are slightly convex, and 
girt round the shoulders by a single row of small, oblong, curved, comma-like tuber- 
cles ; the posterior margins are nearly straight, and furrowed by a broad, deep sulcus, 
which is traversed by a few concentric lines, so faint as scarcely to detract from the 
smoothness of the surface; the sutural edge is thickened, and bordered by two closely 
set, undulating, sharp, raised lines; the last whorl contracts somewhat suddenly in 
front and terminates in a short, rather wide, and curved canal, slightly bent backwards 
at the anterior extremity. The spiral lines are unequal, thick prominent lines alter- 
nating with very slender, thread-like lines ; the larger lines are granulated with much 
regularity by the successive margins of the outer lip; the smaller lines are but faintly 
decussated. ‘The’ aperture is rather widely oval; the outer lip slightly arched and 
sinuated at the shoulder; the sinus very wide, moderately deep, and triangular in 
form; and the columella, which is a little twisted, presents a small crest in front. 
This species presents an elegant ornamentation, quite distinct in character from 
that of any other English Eocene Pleurotoma. It appears to be exceedingly rare. 
Size.—Axis, 11-12ths of an inch; diameter, 4-12ths of an inch, nearly. 
Locality.— Barton. 
No. 232. Prevroroma acutisinuata. Ff. #. Edwards. Tab. XXXII, fig. 5, a, 6. 
P. testd elongato-fusiformi, gracil, sub-turritd, acuminata, undique spiraliter lineata : 
anfractibus conveviusculis, ad humeros angulatis, postice declivis, concavis ; lineis spiralibus 
confertis, irregularibus : aperturd sub-quadratd, in canali brevi exeunte ; labro paululum 
areuato ; sinu ad humerum collocato, latissimo, minime profundo, trigono, ad apicem acute 
angulato. 
Shell slender, oblong-fusiform, somewhat turreted, and ornamented with con- 
centric, raised lines, which cover the whole surface ; spire pointed, elevated, exceeding 
the aperture in length. The whorls, seven or eight in number, are depressedly 
convex at the sides, and sharply angulated, almost keeled, at the shoulders; and the 
posterior margins which slope gently backwards, are slightly channeled and girt by a 
single raised line round the suture. The spiral lines are close-set, threadlike, equal, 
