450 GASTEROPODA OF THE INFERIOR OOLITE. 
cincta, a Corallian species, and may possibly be identical. 7. Lindonensis is rather 
abundant in the ‘“‘ base-bed”’ at Lincoln (Murchisonx-zone), where it seems to 
replace 7. caliz. Specimens of Trochotoma from the Tronstone of Duston also 
possess considerable resemblance to the Lincoln shells. 
391, Trocnoroma ruNnaTa, Lycett, 1850. Plate XLI, figs. 5 a, 5d. 
1850. Trocnotoma FunATA, Lycett. Ann. Mag. Nat. Hist., 2nd ser., vol. vi, p. 417. 
1853. — — — Proce. Cotteswold Nat. Club, vol. i, p. 78. 
1854. _— — — Morris, Cat., p. 280. 
Bibliography, §c.—The acceptance by Morris of this species as an Inferior 
Oolite fossil is a strong point in its favour, but owing to the absence of any 
material evidence it was not listed by Hudleston and Wilson. Since that time a 
specimen answering fairly well to Lycett’s diagnosis has been obtained from the 
Pea-grit of Nailsworth Hill. In some respects this specimen reminds me of 
Pleurotomaria." 
Description : 
Height : 4 : : 5 UE sanjay, 
Basal diameter : P ; 4mm: 
Spiral angle . : 4 : a ORY 
“ Blevated, acuminated, nearly smooth; whorls convex, their lower portions 
flattened, with numerous encircling granulated ribs, faintly traced; basal excava- 
tion contracted. Height about equal to the basal diameter.’’ 
The aperture of the figured specimen has greatly the aspect of Pleurotomaria, 
but 1 cannot find any trace of the sinus-band. 
Famity—FISSURELLIDA. 
Shell conical, limpet-shaped; apex recurved; nucleus spiral, often disappearing 
in the course of growth; anterior margin notched or shell perforated ; muscular 
impression horseshoe-shaped, open in front. 
There are three genera of this family in the Inferior Oolite, Rimula being the 
most characteristically developed. In the case of Hmarginula the anterior notch 
is not always in evidence. It is probable that the shelis in the Jurassic Rocks 
1 Lycett also described ‘‘ Plewrotomaria funata.” 
