24 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 
PLEUROTOMARIA GRANULATA, Sow., sp. Tab. XXXI, fig. 8, 8 a. 
TROCHUS GRANULATUS, Sow. Min. Con., t. 220, fig. 2. 
PLEUROTOMARIA GRANULATA, Deslong. Mém. Soc. Linn., viii, pl. 16, figs. 6—8. 
— — D’Orb. Prodrome, p. 267. 
— — Morris. Cat. Brit. Foss., 1854, p. 271. 
— — Quenstedt. Der Jura, p. 414, tab. 57, figs. 5—7. 
Testa trochiformi subturrita, apice acuta, anfractibus convextusculis, in medio angulatis, 
subgradatis, superne planiusculis, inferne convexiusculis, transverse et longitudinaliter 
striatis ; sinu angusto, fascia sinus prominente, transverse tenuissime striato, in medio 
anfractuum sita ; ultimo anfractu ad basin subangulato, basi subconvexa, concentrice striata ; 
umbilico minimo aut subnullo ; apertura subquadrata labro sinistro crassiori reflecto. 
Shell trochiform, subturreted ; apex acute ; volutions rather convex, angulated in their 
middle portions, or somewhat step-like, the upper half of each volution being flattened, the 
lower half rather convex ; the surface is longitudinally and transversely striated, the decus- 
sations of the strie forming granules or tubercles, of which there are usually five rows 
above and four beneath the mesial angle, the uppermost row having the tubercles more 
prominent and separated than the others; the sinus is narrow, and of moderate depth; 
the fascia of the sinus is prominent, with fine, transverse striations, and placed in the 
middle of the volution ; the last volution has the base somewhat angulated ; the base is 
convex, and concentrically striated; the umbilicus is very small or almost none; the 
aperture is subquadrate, the left lip being thickened and reflected. 
A beautiful species, not very regular in the disposition of the longitudinal and transverse 
striations, but for the most part those beneath the mesial fascia are more strongly marked 
than above. 
The height of the entire shell and diameter of the last volution are equal in the 
specimen figured; others have the height somewhat greater; 16 lines is a medium size. 
Geological Positions and Localities. The Inferior Oolite of the south-west of England 
and the Cornbrash of the coast of Yorkshire. Our specimen is from Gristhorpe, in the 
collection of Mr. Leckenby. It is moderately abundant. 
Cyzinprites Exieua, Lyc. Tab. XLIV, fig. 14. 
Testa parva, subcylindricd, spira elata conica, apice obtuso, anfractibus 5, latis, paulu- 
lum convexis, spira vero lateribus subconcavis ; anfractu ultimo margine rotundato, aper- 
tura angustissimo. 
Shell minute, subcylindrical; spire elevated, conical, its sides being, however, slightly 
concave, and its apex obtuse; the volutions are five in number, moderately wide and 
