195 



This species is very variable in form ; we have represented three 

 varieties, namely, that with the rounded posterior angle, that which 

 is tuberculated and the ovoid form, 



7. VoLUTA VOLVACEA (pi. xlvl. f 3,4; pi. li. f. 61.), Lam. 

 Testa ovato-turbinata, Isevi, crassa, albido-flavescente, fusco ob- 

 scure nebulosfi, spira breviuscula, apice parvo, papillari, obtusius- 

 culo, anfractibus senis, idtimo maximo, postice rotundato, subangu- 

 iato ; apertura magna, latiori; columella plicis 4, validis, penultima 

 subduplicata. 



Shell ovato-turbinated, smooth, thick, wliitish yellow, clouded 

 with dull brown; spire short, apex small, papillary, rather obtuse; 

 volutions 6, the last very large, and posteriorly obtusely subangular ; 

 aperture large, broad; columella with four distinct folds, the last 

 of wliich is somewhat doubled. 



We have represented the tliree principal varieties of tliis shell; 

 one, wliich is the usual variety, without spines ; another, with a 

 row of strong vaulted spines around the posterior part of the last 

 volutions, and the ovoid variety : the first is in Mr. Cuming's, the 

 second in Mr. Norris's collection, and the last in the British Mu- 

 seum. 



8. VoLUTA Zebra (pi. Uii. f. 83, 84.), Leach: Zool. Misc. 

 (1814), vol. i. 1. 12. f. 1. 



Testa ovato-oblonga, crassa, Isevi, albida, strigis aurantiaco-cas- 

 taneis vel castaneis, longitudinalibus, angustis, uudulatis, crebris, 

 picta; spira brevi, conica, apice papillari; anfractibus 2\, primis 

 papillam efformantibus, 3tio 4toque paululum granosis, ultimo 

 magno, postice ventricosiore ; apertura subelongata, labio extemo 

 crassiore ; columeUae phcis quatuor validis, antica minori. 



Shell oblong-ovate, thick, smooth, wliitish, marked with chesnut 

 or orange chesnut, narrow, undulated, close-set, longitudinal streaks; 

 spu-e short, corneal, with a papillary apex of 2^ volutions, the 3rd 

 and 4th volutions sHghtly granose, the last large, ventricose beliind ; 

 aperture somewhat elongated, with a tliickened outer lip ; columella 

 with four distinct folds, of which the anterior is the smaller. 



Placed by Lamarck among the Marginella?, under the name of 

 Margmella radiata, in 1822. We are inclined to regard the Vol. 

 lineata. Leach, Zool. Misc. vol. i. t. 12. f. 2. as a variety of this 

 species ; it differs in being somewhat more elongated, less ventri- 

 cose, of a darker colom-, and in having the spire rather more pro- 

 duced, mth the row of granules more distinct; its outer lip also is 

 not quite so much tliickened ; we have represented both varieties. 



