VOLUTA SUTURALIS. 51 



Specific Characters. — Shell smooth, oval, o'lobular, flattened on the side next the 

 mouth; spire depressed but not covered or hidden l)y the last whorl as in T. 

 europma ; mouth narrow ; outer lip thick and wide, nearh^ straight ; pillar sliglitl}' 

 curved ; canal open, indistinct. 



Bimensions. — L. 15 mm. B. 13 mm. 



Distribution. — Not known living-. 



Fossil : Newbournian Crag : Waldringfield. 



Upper Miocene : Sceaux, Angers. 



BemarJiS. — The shell here figured is from Major Moore's collection. It corre- 

 sponds with a specimen which M. Dollfus has kindly sent to me from the Miocene 

 deposits of Angers. Prof. Sacco suggests that this species may possibly be related 

 to T. sphsericulata. It differs from the Crag Trivise, however, in its uncovered 

 apex, a feature it shares with a different Box-stone shell. The Waldringfield 

 fossil is probably derivative. 



Genus VOLUTA, Linne, 1758. 



Voluta suturalis, Nyst. Plate II, fig. 10. 



1836. Voluta svturalis, Nyst, Eecli. Coq. foss. Housselt, p. 38, pi. iv, fig. 100. 



1843. Vohda snturalis, Nyst, Coq. foss. Terr. Tert. Belg., p. 592, pi. xlv, fig. 6. 



1881. Vohita suturalis. Keeping and Tawney, Quart. Journ. Geol. Soc, vol. xxxvii, p. 111. 



Specific Characters. — Shell ovate, subf usiforra ; spire very short, with an obtuse 

 apex; suture inconspicuous ; upper whorls nearly flat, none of them keeled, the last 

 convex ; covered externally and internally with exceedingly fine spiral ridges 

 extending to the base of the shell, equal to the spaces between them ; mouth long, 

 ovate, nearly three-fourths the total length, ending in a short, wide, and open canal; 

 outer lip thin, regularly arched ; columella with two prominent folds. 



Dimensions. — (Of crag shell) L. 18 mm. B. 10 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. Lower Oligocene — 

 Brockenhurst beds : New Forest, Isle of Wight. 



Lower Oligocene : Belgium. 



Remarks. — I have a unique specimen from Oakley of a Volute, somewhat worn 

 and not full grown, which closely resembles V. snturalis, Nyst, especially in form 

 and the absence of any keel upon the upper part of the body whorl, although it is 

 covered throughout by exceedingly fine spiral ridges, whereas in Nyst's figure such 

 ornament is confined to the base of the shell. The Oakley fossil differs from that 

 figured by Wood in his first Supplement as V. luctatrix, Sol. (tab. vi, fig. 14), and 



