GASTEROPODA. 19 



approximantibus. Ala magna, expansd, in digitos duobus productd, digitis parvis, caudd 

 brevissimd. 



Shell turrited ; whorls numerous, each with an acute mesial carina, the last whorl with 

 two carinas ; the edges of the carina undulate and are nodulated ; the whorls are trans- 

 versely striated above the carina ; beneath are two prominent striae, bordering the suture ; 

 wing large and expanded, extended into digitations ; the digitations are small, the caudal 

 termination very short. 



This elegant shell possesses a certain family resemblance, which places it near to several 

 of our Great Oolite examples of the genus. The acute carina reminds us of A. trifida, the 

 nodules of A. hamus, and the general figure of the wing and caudal extremity of A. 

 paradoxa ; the whorls are comparatively numerous and narrow, the mesial carina very 

 prominent, and the junctions of the whorls strongly defined. 



Locality. The white stone of Eastcombs has furnished our only example. 



Alaria atractoides, Desl. sp. Plate III, figs. 7, 7a. 



Pterocera atractoides, Deslong champs. Mem. Soc. Linn, de Normandie, vol. vii, 



p. 166, pi. 9, figs. 7, 8, 9. 



— — Desk. Lam. An. sans Vert., 2d Edit., 1843, torn. 9, p. 681. 



— — D'Orb. Prod. Paleont., p. 302. 



A. " Testa fusiformi, transversim striata; striis alternis altioribus ; anfractibus bicarinatis 

 [carina superior e major e)longitudinaliter plicato-nodosis, plicis remotiusculis, nodis quadratis, 

 acutis, ultimo anfractu subgibbo ; caudd longd, incurvd." (Deslongchamps.) Aid expansd 

 in digitis trigonis quatervis vel quinque (digito superiori majori). 



Shell fusiform, transversely striated ; striae alternately elevated ; whorls twice carinated 

 (the upper carina being the largest), longitudinally nodulated and plicated ; the plications 

 remote, the nodules square and acute. The last whorl is large, the canal long and curved, 

 the wing expanded, having four and perhaps five triangular digitations, of which the 

 upper one is the largest. 



We have three specimens of this rare shell, in one of which the wing is well developed, 

 with the exception of the extremity of the lower digitation, which may be imperfect. 



Locality. The planking beds of Minchinhampton Common. Great Oolite (caillasse), 

 Ranville, Normandy. (Desl.) 



Alaria hex agon a. Plate III, fig. 8. 



A. Testa turritd ; anfractibus paucis (4), angulatis et nodulosis ; nodulis 6 hexagonis ; 

 ultimo anfractu unicarinato, nodulosa, varicem ori oppositum gerente. Aid parvd, caudd 

 sublonga ; aperturd contractu, ovatd; labro sinistra tenui. 



Shell turrited ; apex obtuse ; whorls few (4), prominently angulated and nodulated ; 



