GASTEROPODA. 21 
Nerivorsis Arcuiact, D’drch., sp. Tab. XXXI, fig. 7, 7a. 
TuRBO CANALICULATUS, D’ Archiac. Mém. Soe. Géol. Fr., vol. v, pl. 29, fig. 6. 
— Arxcuract, D’Orbigny. Prodr., i, p. 300. 
Testa ovato-depressa, spira elata, anfractibus tribus vel quarternis, angustis, inflatis, 
suturis profunde canaliculatis, anfractu ultimo costis transversis obscuris, inequalibus, 
trregularibus, strusque crebris decussatis ; striis tenuibus, regularibus, undatis ; apertura 
ampla, suborbiculari. 
Shell ovate, depressed ; spire elevated, consisting of three or four volutions, which are 
narrow, inflated, their sutures deeply channeled ; the last volution has some obscurely 
marked, irregular, and unequal transverse costa decussated by encircling striations; the 
striations are regular, very closely arranged, faintly impressed, with small, wave-like 
undulations ; the aperture is large and rounded. 
More depressed than JV. su/cosa and NV. striata, but with larger volutions, the sutures 
being also more deeply channeled ; the ornamentation of the surface is so faintly impressed 
that it is scarcely perceptible without the aid of a magnifier. 
Geological Positions and Localities. A rare species, from the Cornbrash of Scar- 
borough, in the collection of Mr. Leckenby. Hparcy, France. 
Trocuus Guisz1, Zyc. Tab. XLV, fig. 14. 
Testa alta conica, apice acito, anfractibus (6) latis, leviter concavis, anfracté ultimé 
subangulato, basi convexo, concentrice striato ; anfractibus, costis obscurts, obliquis, ad basin 
bi-cinctis ; apertura depressa. 
Shell elevated, conical; volutions (6) wide, apex acute, slightly concave in their middle 
portions ; the last volution angulated ; the base convex, with fine, encircling striations ; 
the sides of the volutions have delicate, obscure, oblique costee, which are interrupted 
towards the base of each volution by two narrow, encircling bands; the sutures are 
delicate and faintly marked ; the aperture is depressed. 
‘The ornamentation of this little Trochus is regular and but faintly sculptured ; the 
encircling bands are rendered slightly nodular by the decussating coste. 
The name in compliment to W. V. Guise, Esq., President of the Cotteswold Naturalists 
Club. 
Geological Position and Locality. ‘The Great Oolite of Minchinhampton, collected by 
E. Witchell, Esq. 
