80 MOLLUSCA FROM THE GREAT OOLITE. 
minute or obsolete ; the upper border of the whorls has an obscure encircling row of 
tubercles ; fascia of the sinus marginal; the aperture quadrate. 
The delicate markings upon the surface are only visible under a magnifier. The general 
figure and character of the surface nearly approximates to Plewrotomaria punctulata, 
Deslongchamps, but in that species the fascia of the sinus is placed upon the middle of the 
whorls, and it is destitute of the upper encircling band of tubercles. 
Axis 4 lines, basal diameter 6 lines. 
Locality.” The white stone of Bussage has furnished our specimen, but the species is 
very rare. 
PLEUROTOMARIA ComposiTA. Plate X, figs. 13, 13a. 
P. Testé turbinatd, conicd; spird subacutd ; anfractibus superné convewxis, infra 
planatis vel subconcavis ; sinu magno; fascia sinis latd, longitudinaliter striatd, in medio 
anfractuum sitd ; anfractibus supra fasciam densissimé longitudinaliter et oblique striatis ; 
striis inequalibus ; infra fasciam striis transversis equalibus profundis subdistantibus ; 
anfractu ultimo ad basim rotundato; facie infimd pland, vel subconvexd, longitudinaliter 
fenuissime et inequaliter undulatim striatd ; umbilico nullo? vel minima; apertura sub- 
pentagonali. 
Shell turreted, conical; spire subacute; whorls convex in their upper portions, 
flattened or slightly concave in their lower; the sinus large, the band of the sinus wide, 
longitudinally striated, and situated in the middle of the whorls; the whorls above the 
band are, longitudinally, densely and obliquely striated; the striz are unequal; beneath 
the band the whorls are transversely striated; the strize are equal, deeply impressed, and 
rather distant; the last whorl is rounded at the lower margin; the base is flat or slightly 
convex, it is longitudinally, densely, and unequally striated; the striz undulate ; umbilicus 
none or minute; aperture subpentagonal. Axis 9 lines, basal diameter 11 lines. 
Locality. The lower weatherstone beds at Quarrhouse and Minchinhampton have 
yielded several specimens. 
Trocuoroma, Lycett. Deslongchamps, 1842. 
Rimutvs, D’ Orb. 1839. 
DirreMaria, D’ Ord. 1842. 
T. Testa turbinatd, conicd ; anfractibus sepissimé angulatis, in medio vittd strictd 
notatis ; peripherid subangulatd ; aperturd subquadratd ; columelld arcuatd ; basi eacavata, 
