86 Dentition of Pulmonate Mollusks. 
Lingual membrane with ten laterals on each side, still more bifid mavr- 
ginals. (Pl, UI, fig. E.) On the same plate, fig. F, is figured a central 
tooth from another part of the same membrane, in which the cutting point 
is abnormally developed. 
Velifera. 
Known only by the single species, V. Gabdi, Costa Riea, 
Dr. W. M. Gabb. 
Jaw with smooth anterior surface and beak-like projection to the cutting 
edge. 
Lingual membrane (PI. II, fig. H) with the general arrangement of Zo- 
niles ; the first laterals have an inner side cutting point ; marginals aculeate, 
with side spur. 
Its lingual membrane resembles that of Limax agrestis, in 
having the inner, abnormal side cutting point to its first lateral 
teeth. All the marginals are bifid. 
Macrocyclis. 
Macrocyclis Baudoni, Petit. Guadeloupe, Mr. Schramm ; 
Dominica, Mr. Guppy. 
Jaw delicate, transparent, colorless; ends pointed ; anterior surface 
smooth ; cutting edge with median projection. 
Lingual membrane as in Macrocyclis. (See Terr. Moll., V.) I could not 
distinguish the characters of the very small central tooth. 
Macrocyclis euspira, Pir. Placed in Ammonoceras, a sub- 
genus of Hyalina, by von Martens, but, from its lingual mem- 
brane, shown to belong to Macrocyclis. 
Jaw low, crescentic; ends pointed; cutting margin with a decided, 
sharp, median projection. 
Lingual membrane (pl. I, fig. I) long and narrow; teeth arranged as in 
Macrocyclis. There are, however, no transition teeth, as in the American 
species; all the side teeth being true marginals of the aculeate type. 
Teeth, 30-1-30. The centrals are deeply emarginate at the upper edge of 
their base of attachment, and have expanded lower lateral angles ; they 
have also a well-marked, simple, median cusp, with a decided cutting point. 
@Zomites. (See Terr. Moll., V.) 
Zonites? Bermudensis. Pfr. Bermuda. Mr. J. J. Crooke; 
Mr. J. Matthew Jones. 
Jaw extremely thin, arched, with a blunt, median projection to its cutting 
edge. | ‘ 
Lingual membrane long and narrow. Central teeth tricuspid ; laterals 
bicuspid ; the cusps in each long and slender. Marginals numerous, acu- 
leate, in oblique rows. 
