Description of some New Species of Fossil Shells. 103 



Genus Voluta. — Linnceus. 

 V. duhia. PI. 1, fig. 23. 



V. testa fusiformi, crassa, longitudinaliter sulcata, striis trans- 

 versis minimis ; spira valde elevata, mammillata ; anfractibus sep- 

 tenis, planulatis ; suturis minimis; CQlumella quadriplicata ; pli- 

 cis inferioribus asqualibus superioribus ; apertura angusta. 



Shell fusiform, thick, with very small transverse lines, longi- 

 tudinally sulcate ; spire very elevated, mammillate ; whorls seven, 

 flat ; sutures very small ; columella with four folds, the lower 

 ones equal to the upper ones ; mouth narrow. 



Length -7. Breadth -35 of an inch. 



Remarks. — The sulcations become more strongly marked upon 

 the last whorl. It is with some doubt, that I place this singular 

 shell among the Volutes, to which genus, however, it seems to 

 belong, from its mammillated apex ; its general form, however, is 

 that of a Mitra, while the folds on the columella are between the 

 two, being all equal.* The mouth is only half as long as the shell, 

 instead of extending nearly from the apex to the base, as in most 

 Volutee. Mr. Conrad has described two species of Mitra from 

 Claiborne, the M. pactilis and M. bolaris, which, as they have 

 mammillated spires, seem to me rather to belong to the Voluta?. 



FAMILY CONVOLUTA. 



Genus Conus. — Linnceus. 

 C. parvus. PI. 1, fig. 24. 



C. testa conica, Isevi, polita, crassa; anfractibus , planula- 

 tis, superne et transverse striatis, longitudinaliter et oblique plica- 

 tis infra angulatum ; suturis parvis ; basi striata ; apertura angus- 

 tissima. 



Shell conical, smooth, polished, thick ; whorls , flat, trans- 

 versely striate above, longitudinally and obliquely folded below 

 the angle ; sutures small ; base striated ; mouth very narrow. 



Length . Breadth -12 of an inch. 



Remarks. — This Uttle shell has nothing remarkable about it, 

 except its folds near the shoulder, which, together with its small 

 size, distinguish it from the C. sauridens of Conrad. 



* The distinction between Mitra and Voluta is thus drawn by Lamarck, Ani- 

 maux sans Vert. Vol. vii, part 1, p. 328. " C'est aVec les Mitres que les Volutes ont 

 le plus de rapports ; mais elles en sont erainemment distinguees : 1, par les pljs de 

 leur columelle dont les inferieurs sont les plusgros et les plus obliques; 2, par I'ex- 

 tremit6 de leur spire qui est obtuse ou en mammelon." 



