86 Dentition of Pulmonale Mollusks. . 



Lingual membrane with ten laterals on each side, still more bifid mar- 

 ginals. (PI. II, 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. Gabbi, Costa Rica. 

 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- 

 niies ; 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 euxpira, Pir. Placed iu 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 (pi. II,. 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. 



Zonitcs. (See Terr. Moll., V.) 

 Zoniies? 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. 



