242 PLIOCENE MOLLUSCA. 



Fossil : Coralline Crag : Gomer pit^ Newbouriiian : Waldring- 

 liold. Pleistocene clay : Belfast. 



Scaldisien : Holland, Belgium. 



Upper Miocene (Tortoniano) : Castelnuovo d'Asti. Lower Pliocene : Castel- 

 nuovo d'Asti, Zinola, Albenga. Upper Pliocene : Biot, Monte Mario, Bologna, 

 Asti, Livorno, Altavilla. Pleistocene : Monte Pellegrino, Reggio, Gravina, Naso. 



Remarks. — Bellardiella, of which the present species has been taken as the 

 type, was proposed by Fischer as a sub-genus of Mangilia, and this view has 

 since been adopted by the Conchological Society of Great Britain. M. Cossmann 

 and others group it with DavhneUa, which, however, Fischer regards as a sub-genus 

 of MangiVia. In view of this conflict of nomenclature I follow Profs. Sacco and 

 Kobelt in using Bellardiella as the name of a separate genus. The use of the 

 trinomial system is attended with considerable inconvenience, and I am glad of an 

 excuse to escape from it in the present case. Fischer's diagnosis of Bellardiella is 

 that it is a slender shell near the true Pleurotomas, the labial sinus being sutural 

 and the canal moderately long. 



B. gracilis is a British form, its range being mainly southern. It has not been 

 reported hitherto from the English Pliocene, but I have noticed a specimen from 

 the Coralline Crag, not quite perfect, in the Sedgwick Museum at Cambridge, and 

 Mr. Bell informs me there is another in the Museum at Belfast which was found 

 some years ago in the estuarine (Pleistocene) clays of that region by Mr. Stewart. 

 I have not met with it at Oakley, but it may turn up hereafter in the Waltonian as 

 it occurs, according to Nyst, in the Scaldisien of Belgium, and Dr. Tesch has obtained 

 it at the same horizon in one of the Dutch borings. Bellardi gives it from the 

 Miocene and Pliocene deposits of northern Italy under Donovan's name of Murex 

 emarginatus. It is a well-marked form and easily recognised. 



Bellardiella volutella (Kiener). Plate XXVIII, figs. 32, 33. 



1840. Pleurotoma volutella, Kiener, Icon. Coq. viv. (Pleurotoma), p. 67, pi. xxv, fig. 1. 



1844. Pleurotoma volutella, Philippi, Enum. Moll. Sicilise, vol. ii, p. 165. 



1873. Defrancia volutella, Seguenza, Boll. R. Com. Geol. Italia, vol. iv, p. 298, no. 122. 



1910. Ba})hnella {Bellardiella) volutella, Cervilli-Irelli, Palaeont. Ital., vol. xvi, p. 62, pi. vi, figs. 1 — 4. 



Sjpecijic Characters. — Shell small, fusiform, turreted ; spire elongate, regularly 

 diminishing in size ; whorls 7, convex, the last about two-thirds the total length ; 

 ornamented by well-marked flexuous longitudinal costae which reach the body- 

 whorl but not the base of the shell, and by fine spiral lines which cross the ribs ; 

 mouth oval, angulated above, outer lip regularly curved, somewhat expanded, 

 smooth inside with a thin edge but thickened outside by the labial rib ; labial 

 sinus inconspicuous ; canal short, Avell defined. 



