BULINUS. 87 



from others nearly related to it, into which many of the species 

 run by imperceptible gradations. The genus Nassa has been 

 separated on account of the little notch, which terminates the 

 columella. Some species of Terebra come so close upon the 

 Buccina, that it is difficult to say where one genus ends and the 

 other begins. T. Buccinoides, fig. 427. Buccinum Undatum, 

 the common Whelk, fig. 421. 

 BUFO. Montf. A generic division of the species composing Ra- 

 nella, characterized as having the shell not umbilicated. Em R. 

 ranina, fig. 394. The above character is scarcely sufficient in 

 some cases, even as a specific distinction. 

 BULBUS. Humph. Rapella, Swainson. A genus formed for 

 the reception of Pyrula papyracea, Auct. (fig. 389), and similar 

 species. Rapanus, Montf. 

 BULIMIMA. Montf. A genus of microscopic Foraminifera. 

 BULIMULUS. Leach. Fam. Colimacea, Lam. The author is 

 unacquainted with the characters by which the two or three 

 species included in this genus are to be distinguished from Bu- 

 linus. We have represented, fig. 283, Bulimulus trifasciatus, 

 Leach, (Bulinus Guadaloupensis, Auct ) This occurs in the same 

 limestone which encloses the half fossilized human remains from 

 the Grand Terre of Guadaloup. Several species are described by 

 the Rev. L. Guilding in the Zoological Journal, namely, the B. 

 Undulatus, Antiguensis, and Proteus ; but neither from the shells 

 themselves, nor from the figures of the animal, can we draw any 

 information as to the generic character ; the difference alleged by 

 Mr. Swainson and Mr. Gray being a comparative thinness in the 

 outer lip. 

 BULINUS. Brug. (Bulinus, Lam.) Fam. Colimacea, Lam. Li- 

 macinea, Bl. — Descr. Oval or oblong, light, covered with a thin 

 epidermis ; spire obtuse, variable in length and in the number of 

 whorls, which are generally few ; aperture wide, oval, rounded 

 anteriorly ; outer lip simple, usually reflected, joining the colu- 

 mella without a sinus ; inner lip reflected over part of the body- 

 whorl. The Bulini are land shells, found in many parts of the 

 world.— Obs. The genus Bulinus can only be distinguished from 



