288 VEXILLA. 



This extensive genus, including some bivalves of splendour and 

 beauty, justifying the name given to it, may be known from 

 Cytherea by the absence of a lateral tooth, which is found near 

 the cardinal teeth in the latter. Artemis is distinguished not 

 only by its beautiful form, but by the deep angular sinus in the 

 palleal impression. Fig. 119, 119 a. Found mostly in tem- 

 perate and tropical climates. 



VERMETUS. Adanson. Fam. Scalariana, Lam. Cricostomata, 

 Bl. — Descr. Spiral at the apex, irregularly twisted towards the 

 aperture; aperture round, small. — Obs. This shell resembles the 

 Serpulse in general appearance, although it is regularly spiral near 

 the apex. The animal is known to be a true mollusc, rather 

 nearly allied to that of the genus Dentalium, which is also placed 

 wrongly in the Lamarckian system. Vermetus Lumbricalis, 

 fig. 345. Coast of Africa. 



VERMICULAR. {Vermicularis.) Worm-shaped, tubular, serpen- 

 tine. Ex. Vermilia triquetra, fig. 7. 



VERMICULARIA. Lam. Vermetus, Adanson ; afterwards Ver- 

 metus, Lam. 



VERMILIA. Lam. A genus composed of species of Serpula, which 

 are attached by the whole length of the shell, no part being free. 

 Vermilia triquetra, fig. 7. 



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

 fera. 



VERTEX. Apex. 



VERTIGO. Miill. Fam. Colimacea, Lam— Descr. Cylindrically 

 fusiform, sinistral, hyaline ; aperture marginated, sinuated, denti- 

 culated on the inner edge ; peristome sub-reflected. — Obs. This 

 genus of minute land shells, resembles Pupa, but is a reversed, 

 hyaline shell. Vertigo pusilla, fig 293. Europe. 



VERRUCA. Schum. Clitia, Leach. 



VESICA. Sw. A sub-genus of Bulinus, Sw. p. 360. 



VEXILLA. Sw. A genus of " Nassinae," Sw. thus described : 

 ^ General shape of Purpura, the inner lip flattened and depressed; 

 the outer, when adult, thickened, inflected and toothed ; aperture 

 wide ; picta Sw. Chem. pi. 157, f. 1504-5." Sw. Malac. p. 300. 



