VOLUTID”, 165 
observer. Internal margin strongly callous ; external lip obtuse 
and thickened. V. concinna, Brod. (iii, 16). 
AusoBA, H. and A. Adams. Spire short and obtuse, terminated 
by a papilliform summit; last whorl coronated. V. cymbiola 
(Chemn.), Sowb. (liii, 17). 
VOLUTILITHES, Swains. 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 plice; lip thin. The group is repre- 
sented by a single living species and numerous tertiary forms. 
V. abyssicola, Adams and Reeve (liii, 18). 
voLutToconus, Crosse. Oblong, subcylindrical, longitudinally 
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 
strie. V. coniformis, Cox (liii, 19). 
CALLIPARA, Gray. Shell oblong, subcylindrical; spire short, 
nucleus small; columella with two plications. V. bullata, 
Swainson (liii, 20). 
MAMILLANA, Crosse, Shell widely oval, ventricose, rather thin, 
intermediate between Voluta and Cymbium; nucleus papilli- 
form, very strongly developed, excentric and lateral; columella 
with a few oblique plice; 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 Voluta, 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 always straight or nearly so, 
and the folds are as isolated and distinct as those of Turbinella. 
