310 VOLUTA. 



ture wide ; picta Sw. Chem. pi. 157. fig. 1594-5." Sw. Malac. 

 p. 300. PL XXV. fig. 544. 



VIEGTJLINA. D'Orb. A genus of microscopic Foramini- 

 fera. 



VITEELLA. Sw. A sub-genus of " BuUinse," Sw. Lardn. Cy- 

 clop. Malac. p. 360. 



VITEINA. Drap. {Vitreus, glassy.) Fam. Limacinea, Lam. 

 and Bl. — Descr. Ovate thin, glassy, fragile ; spire short ; last 

 whorl large ; aperture wide, transverse ; peritreme simple ; 

 columella spiral, linear. — Obs. This genus of land-sheUs is 

 not known in a fossil state. The recent species are fovmd 

 among moss and grass, in shady situations. De Perussac has 

 divided this genus into Helicolimax, fig. 263, and HeUxarion, 

 fig. 262. 



VITULAEIA. Sw. A genus of " MuricinaB," Sw. thus described : 

 " General habit of Muricidea, but the inner lip is depressed and 

 flattened, as in the Purpurince ; varices simple, nearly obsolete. 

 Tuberculta, Sw. En. M. 419. fig. 1. (Murex vitulinus, Auct.)" 

 Sw. p. 297. PL xxvi. fig. 553. 



VIVIPAEA. A generic name given by Montfort, and retained 

 by some authors on the ground of priority for Paludina, Lam. 

 on account of the animals being viviparous, i. e. the young being 

 perfectly formed before they leave the ovaries. 



VIVIPAEOUS. See Yivipaea. 



VOLUTA. Auct. (Volvo, to revolve.) Fam. Columellaria, Lam. 

 Angyostomata, Bl. — Descr. Sub-ovate, rather angulated, thick, 

 generally tuberculated, smooth; spire short, conical, with a 

 mammillated apex ; aperture generally angulated, large, termi- 

 nating anteriorly in a deep notch ; columella smooth, with 

 several plaits, of which the lowest is the largest; outer lip 

 thickened within. — Obs. The genus Yoluta, as left by Linnaeus, 

 is only characterized by the folds on the columella, and includes 

 many shells which, although they agree in this respect with the 

 genus, are yet quite opposite to each other in all other characters. 

 Thus the Auriculae, which are land shells, and have the aperture 

 entire, are mixed up with others which are marine, and have a 



