GASTEROPODA. 21 



Neritopsis Arciiiaci, D' Arch., sp. Tab. XXXI, fig. 7, 7 a. 



Turbo canaliculatus, jy Archiac. Mem. Soc. Geol. Fr., vol. v, pi. 29, fig. 6. 

 — AuciiiAci, Tf Orh'ujmj . Prodr., i, p. 300. 



Testa ovato-depressa, spira data, anfmctibus tribus vel quarternis, ant/ustis, inflatis, 

 suturis profunde canaliculatis, anfractu ultimo costis transversis obscuris, inaqualibus, 

 irregularibus, sfriisque crebris decussatis ; striis tenuibus, regularibus, undatis ; apertura 

 ampla, siiborbicidari. 



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 N. sulcosa and N. 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. Eparcy, France. 



Trochus Guisei, Lgc. Tab. XLV, fig. 14. 



Testa alta conica, apice acuto, anfractibus (6) latis, leviter concavis, anfractu ultimo 

 subangulato, hasi convexo, concentrice striato ; anfractibus, costis obscuris, 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 costse, 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 costse. 



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. 



