120 Dentition of Pulmonale Molluskst 



Cylindrella elegans, Pfr. (Gongylostoma.) Cuba. Mr. 

 Aran go. 



Lingual membrane iPl. XIV, fig. B) with 12-1-12 teeth arranged en chevron ; 

 centrals long, narrow, apex recurved with three short, bluntly trilobed 

 cusps and large cutting point ; laterals with one inner, widety expanding, 

 oval, inner cutting point, surmounted by a blunt narrow pedicle, and one 

 much smaller cutting point on a narrow, high pedicle; there are no distinct 

 marginals, the teeth becoming much modified in shape as they pass off 

 laterally. 



Cylindrella ornata, Gundl. (Gongylostoma). Cuba. A dried 

 specimen in Mr. Bland's collection. 



Lingual membrane (PL XIV, fig. A) with 18-1-18 teeth; as in last 

 species. 



Cylindrella Poeyana, D'Orb. 

 See Terr. Moll., V. 



macroceramus. 



Jaw as in Cylindrella. 



Lingual membrane, See Terr. Moll. V. 



Macroceramus Gossei, Pfr. See Terr. Moll., V. 



Macroceramas turricula, Pfr. Lomas de Camoa, Cuba. Mr. 

 Arango. 

 Jaw with 35 ribs. 

 Lingual membrane as in last species (PJ. XIV., fig. D). 



Macroceramus inermis, Gundl. Curacao. Mr. J. S. Gibbons. 

 Lingual membrane as in M. Gossei. 



Pineria. 



Pineria Viequensis. Pfr. Island of St. Martin. Dr. van 

 Eijgersma. 



Jaw with about 28 ribs as in Cylindrella (PI. XV, fig. B ; upper median 

 portion of the jaw figured is imperfect. 



Lingual membrane (PI. XIV, fig. C) as in group A of Cylindrella; laterals 

 two ; marginals five or six, long, narrow, simple, with irregularly recurved 

 upper margins. 



