VOU'TA. 305 



the columella is unlike the curved oblique plaits of the 

 typical Volutes. The animal, however, as we are informed by 

 the Rev. R. Boog Watson, is a typical Volute. 



102. PROVOCATOR (Pi'ovocator pulcher) Watson (f. 173). — 

 V. testa subfusiformi, postice acuminata, fulva, cuticula albida 

 tenui induta ; spira elata, acuta, apice parvo, acuto ; anfrac- 

 tus 7-8, convexiusculi, sutura obliqua, tegmine vitreo crasso 

 fulvo inferne tenuiter effuso celata ; ultimus infra medium 

 leviter ventricosus, basin versus leviter contractus ; apertura 

 ovata, inferne effusa, superne leviter contracta ; columella 

 rectiuscula, basi acuta, 2-3-plicata, plicis parvis, perobliquis ; 

 labrum levissime incrassatum, superne profunde sinuatum. 



Another very remarkable form discovered in the ' Chal- 

 lenger ' expedition. The spire with thickly enamelled suture 

 is like that of an Ancillaria., and the whole form and texture 

 of the shell is not unlike some of the species of that genus ; 

 it has the columella plaits of a Volute, but these are not very 

 prominent. The animal being a decided Volute I include the 

 species in this monograph, and am unable to use Mr. Watson's 

 specific name, as it is preoccupied. Of the two specimens 

 discovered at stations 149 and 150, one has three columella 

 plaits, and the other only two. 



Not ADorxED. 



Hamillei, Crosse, Journal de Conchyliologie, 1870, p. 70, 

 is a large, well grown, comparatively smooth variety of I '. 

 rupesti'is. 



cancdiculata, McCoy, Ann. & Mag. of Nat. Hist., July, 

 1869, = Harfordi. 



Cleri/ana, Petit, J. de Conch., 1856, p. 182, = Aniericana. 



Stearnsi., Dall, Cal. Proc. iv. t. 1, f. 1, does not seem from 

 figure and description to differ materially from V. Ancilla. 



Macgillivraiji, Cox, is a variety o^ piiierlta. 



fusus, Quoy, = ixicifica. 



ceraunia, Crosse, J. de Conch., 1880, pi. 4, is a variety of 

 jpijperita. 



Prerostiana, Crosse, J. de Conch., 1879, p. 41, pi. 1, f. 1, 

 is a variety o^ meriaspira. 



4 I 



