OF CONCHOLOGY. 209 



SO — 1 — 30 rows of teeth each. Centrals and laterals as in the 

 last species. In the single membrane examined there appear no 

 true uncini, the extreme teeth on the edge of the membrane 

 being more nearly the same as the centrals than is usual in the 

 genus. 



BULIMUS ODONTOSTOMUS, Sowb. 



The specimen examined was collected in Brazil, by Mr. J. G. 

 Anthony. 



Jaw long, narrow, slightly arched, smooth. 



Lingual membrane broad, composed of numerous rows of 

 about 84. — 1 — 84 teeth each. Centrals and laterals as usual in 

 the genus. The uncini are long and narrow, with a long, ob- 

 lique, stout, blunt denticle. The usual smaller denticle of the 

 uncini does not appear to exist on the single membrane examined 

 by us. 



BuLiMULUS SUFELATUS, Gould. Plate 9, figs. 8, 13. 



Jaw thin, long, narrow, slightly arched, composed of twenty- 

 one separate plates ; ends somewhat attenuated, blunt. (Fig. 8). 



Lingual membrane long and narrow, with about 45 — 1 — 45 

 teeth in each row. Centrals, laterals and uncini essentially the 

 same as in B. palUdior. (See Ann. N. Y. Lye. vol. ix, p. 282). 

 One central and one lateral are given in our figure 13. 



BuLiMULUS Marielinus, Poey. 



The specimen examined was received from Florida. 



Jaw short, broad, strongly arched above, moderately so below ; 

 ends attenuated, blunt ; anterior surface with coarse longitudi- 

 nal strise, and with rib-like processes, scarcely elevated, but den- 

 ticulating the cutting edge. 



ACHATINA VIRGINEA, Lin. 



The individual from which was extracted the lingual mem- 

 brane here described was received from Aux Cayes, Hayti, by 

 Mr. Robt. Swift. 



Lingual membrane long and broad, rounded at the anterior 

 extremity, consisting of about two hundred transverse rows of 

 teeth, each row containing at the widest point of the membrane 

 about 40 — 1 — 40 teeth. Down the centre of the membrane is 

 a well defined strip plainly visible to the naked eye, distinct 

 from the balance of the membrane. This conspicuous strip con- 

 consists of the central and lateral teeth, which are arranged in 

 rectilinear rows, showing collectively in contrast to the uncini, 

 which are in curving transverse rows for a small portion of their 



