VOLUTIDiE. 165 



observer. Internal margin strongly callous ; external lip obtuse 

 and thickened. V. concinna, Brod. (liii, 16). 



AUSOBA, H. and A. Adams, Spire short and obtuse, terminated 

 by a papilliform summit ; last whorl coronated, V. cymbiola 

 (Chemn.), Sowb. (liii, IT;. 



VOLUTILITHES, Swaius. Shell oval-fusiform, spire elevated, 

 terminated by a pointed summit ; whorls cancellated or longitu- 

 dinally plicate ; mouth oval-oblong ; columella with numerous 

 rudimentary or obsolete plicie ; lip thin. The group is repre- 

 sented by a single living species and numerous tertiary forms. 

 V. abyssicola, Adams and Reeve (liii, 18). 



VOLUTOCONUS, Crosse. Oblong, subcylindrical, longitudinall}' 

 and transversely striate ; spire short and obtuse, terminated by 

 a rounded summit ; columella with four slightly developed teeth ; 

 lip simple, slightly inflected in the middle ; base with flexuous 

 strise. V. coniformis, Cox (liii, 19). 



CALLiPARA, Grray. Shell oblong, subcylindrical; spire short, 

 nucleus small ; columella with two plications. V. hullata^ 

 Swainson (liii, 20). 



MAMiLLANA, Crosse. Shell widely OA^al, vcntricose, rather tliiu, 

 intermediate between Yoluta and Cymbium ; nucleus papilli- 

 form, very strongly developed, excentric and lateral ; columella 

 with a few oblique plicoe; lip thin. V. mamilla, Gray (liii, 21). 



PROVOCATOR, Watson, 1882. Shell smooth, fusiform ; having 

 the apex of Ancillaria, the enameled suture of Bullia, the pillar- 

 folds of Yoluta, and the sinus of Pleurotoma. V. pulcher, 

 Watson. Kerguelen Island. 



WYViLLEA, Watson, 1882. Shell ovate, cymbiform, thin, 

 rough; spire high scalar; apex mammillate and irregular; suture 

 canaliculate ; mouth large, ovate ; inner lip with a wide-spread 

 thinnish callus ; pillar perpendicular, with a very slight turn, 

 with no teeth, but an abrupt break of the edge about the middle 

 of its length. Differs from Cymbiola in the texture of the shell, 

 which is extremely delicate, but rough, in the canaliculate 

 suture, and toothless pillar. W. alabastrina, Watson. Marion 

 Island. 



The following fossil groups are enumerated by W. M. Gabb, 

 They should probably all be considered as subgeneric under 

 Voluta rather than as distinct genera. 



voLUTODERMA, Gabb. Shape similar to Fulgoraria, which it 

 also resembles more or less in surface-sculpture ; apex not papil- 

 late ; inner lip marked by from three to five well-marked folds, 

 not very oblique, and of pretty uniform size. This is a group of 

 shells characteristic of the cretaceous rocks and perhaps peculiar 

 to them. They are all somewhat slender, and are marked by 

 longitudinal ribs ; the columella is alwa3'S straight or nearly so, 

 and the folds are as isolated and distinct as those of Turbinella. 



