I 



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. xlvi. f 3, 4 ; pi. li. f. 61.), Lam. 



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

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

 culo, anfractibus semis, ultimo maximo, postice rotundato, subangu- 

 lato ; 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 which is somewhat doubled. 



We have represented the three principal varieties of this shell ; 

 one, which 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. Yoluta Zebra (pi. liii. f. 83, 84.), Leach; Zool. Misc. 

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



Testa ovato-oblonga, crassa, la;vi, albida, strigis aurantiaco-cas- 

 taneis vel castaneis, longitudinalibus, angustis, undulatis, crebris, 

 picta; spira brevi, conica, apice papillari; anfractibus 2-^, primis 

 papillam efibrmantibus, 3tio 4toque paululum granosis, ultimo 

 magno, postice ventricosiore ; apertura subelongata, labio externo 

 crassiore ; columella; pbcis quatuor vabdis, antica minori. 



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

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

 spire short, corneal, with a papillary apex of %\ volutions, the 3rd 

 and 4th volutions slightly granose, the last large, ventricose behind ; 

 aperture somewhat elongated, with a thickened outer Hp ; columella 

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



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

 Marginella radiata, in 1822. We are inclined to regard the Yol. 

 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 colour, and in having the spire rather more pro- 

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

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



