yULSELLA. 311 



canal, as Turbinellae, aud the Easciolarise, and others which have 

 merely a notch, as the true Volutes. This genus, as it is cir- 

 cumscribed at present, includes a great number of beautiful 

 shells, most of which are rich in colouring. Cymba and Melo 

 have been separated by Mr. Broderip from the genus Voluta 

 of Lamarck, for reasons stated in their respective descriptions. 

 Eiffcy-eight species are described in the Monograph by the 

 author, in Thesaurus Conchylium, PI. xlvi. to Iv. vol. 5. Our 

 PL XX. fig. 443. 



VOLYAEIA. Lam. (Volva, a shuttle.) Fam. Columellaria, 

 Lam. — Bescr. Cylindrical, convolute, spirally striated; spire 

 very short, nearly hidden ; aperture narrow, as long as the whole 

 shell ; columella with three oblique plaits ; outer lip dentrated. 

 — Obs. The Yolvariae are only known, in a fossil state, and re- 

 semble some species of Bulla in general form, but are dis- 

 tinguished by the plaits on the columella. V. concinna, PL xx. 

 fig. 439. 



VOLUTELLA. Swainson. {A little volute.) A genus composed 

 of those species of Mabginella, Auct, which have the spire 

 concealed, and the aperture smooth within. Eig. 438, Peesi- 

 C¥LA of Schumacher. 



VOLUTILITHES. Sw. {Voluta, and \iBoq, lithos, a stone.) A 

 genus composed of some fossil species of Yoluta, which have the 

 plaits on the pillar generally numerous, indistinct, and some- 

 times wanting altogether, with a pointed spire. Y. spinosa, PL 

 XX. fig. 436. 



YOLUTIOIST. See Whoel. 



YOLYULA. Adams. Sowerby's Thesaurus, Pt. xi. 1850. A 

 genus of BuUidae, the shells of which are thus described: "Sub- 

 cylindrical, beaked at both ends ; spire concealed ; aperture 

 narrow ; inner lip with a single obsolete fold." 



YORTICIALIS. Lam. A genus of microscopic Eoraminifera. 



YULSELLA. Lam. {A little tongue.) Fam. Ostracea, Lau. 

 Margaritacea, 'Si.— Bescr, Bquivalve, irregular, longitudinal, 

 compressed, oblong ; umbones separated by a slight area in both 

 valves ; hinge with a large pit in the centre, containing the car- 



