GASTEROPODA. 77 



PLEUROTOMARIA SCALARIS, Desl. Plate X, fig. 14. 



PLKUROTOMARIA SCALARIS, Deslongchamps. 1848. Mem. Soc. Linn, de Normandie, 



vol. viii, p. 67, pi. 8, fig. 1. 

 Var. a, TURGIDULA, Desl., ibid., p. 67. 

 SCALAKIS, D'Orb. 1850. Prod. Paleont., p. 269. 



P. Testa crassd, trocldfortni; spirdplus minusve exsertd; apice acuto; anfractibus cari- 

 natis, subgradatis aut gradatis, tranverse striatis, sinu magno pro/undo; fascia sinus 

 prominente, leevi aut longitrorsmn densissime striatd, in media anfractuum sitd; ultimo 

 anfractu ad basim angulato, obtusiusculo ; basi pland aut subconvexd; umbilico aut 

 parvo, aut minima, aut nullo; aperturd subquadratd, labro sinistro crassiori reflexo. 

 (Deslongcharaps.) 



Shell thick, trochiform ; spire more or less elevated ; apex acute ; whorls carinated, 

 more or less step-like, transversely striated; sinus large and deep; band of the sinus 

 prominent, smooth, or very finely striated longitudinally, and placed in the middle of the 

 whorl; the last whorl is angulated, or somewhat obtuse at the lower margin; the base 

 is flat, or slightly convex ; the umbilicus small, very minute, or wanting altogether ; the 

 aperture subquadrate, the left lip being thick and turned outwards. 



Altogether we have obtained eight or nine specimens. They vary in the elevation of 

 the spire, and agree with the first variety of P. scalaris of M. Deslongchamps, viz. the 

 turyidula which he thus characterises : 



"Testa conicd, anfractibus subrotundato angulatis, vlx gradatis, transversim obsoletissime 

 striatis, striis in ultimo basis vicinis; basi subconvexd, striis radiatis incrementi tantum 

 notatd, umbilico minima." 



Axis 29 lines, basal diameter 26 lines. 



Locality. The planking of Minchinhampton Common has furnished all our specimens, 

 only three of which are well preserved. Inferior Oolite, Bayeux. (Desl.) 



PLEUROTOMARIA PAGODUS. Plate X, fig. 9. Var. DEPAUPERATA. 



? PLEUROTOMAIUA PAGODUS, Deslongchamps. 1848. Mem. Soc. Linn, de Normandie. 



vol. viii, pi. 14, fig. 4. 

 D'Orb. 1850. Prod. Pateont., p. 301. 



P. Testa trochiformi, subturritd; apice acutiori; anfractibus gradatis, infra fasciam 

 constrictis, transversim et tenuissime striatis, in media nodis coronatis ad suturam subundu- 

 latis; sinu magno, pro/undo; fascia sin/is pland, densissime lonyitrorsum striatd, infra 



11 



