114 Dentition of Pulmonale MollusJcs. 



Lingual membrane (PI. X, fig. G) with 30-1-30 teeth, ten laterals on each 

 side; centrals and inner laterals without side cutting points; marginals low, 

 wide, with one inner, large, oblique bifid cutting point, and one smaller 

 side cutting point. 



Coclilostyla. 



The only subgenus examined is Canistrum, and this only in 

 one species : — 



Canistrum fulgetrum, Brod. 



Jaw arcuate, thick, wide, low, ends but slightly attenuated, blunt ; an- 

 terior surface with more than twelve stout, broad ribs, denticulating either 

 margin. 



Lingual membrane (PL XI, fig. G-) long and broad, with 80-1-80 teeth; 

 centrals and inner laterals without side cusps and cutting points, the reflec- 

 tion and cusp stout, the cutting point blunt ; marginals with greatly pro- 

 duced, bluntly pointed upper margin to the base of attachment. 



1Sulimu§. 



Of this genus species of .several subgenera were examined. 



Macrodontes odontostomus, Sowb. 



Jaw wide, low, slightly arched, smooth. 



Lingual dentition (PL X, fig. H). Teeth 34-1-34 ; the cusps and cutting 

 points are short and stout; no side cusps or cutting points. 



Pelecychihis auris-Sileni, Born. St. Vincent. 



Jaw with delicate, distant ribs, as in Cylindrella, q. t. 



The cutting points on the teeth of the lingual membrane are very long. 

 (PL X, fig. I). The upper, as well as lower, lateral angles of the base of 

 attachment in the centrals and laterals are greatly developed. 



PelecycMlus glaoer, Gmel. Island of Grenada, W. I. 

 Jaw as in last species. 



Lingual membrane (PL X, fig. J) with decided side cusps and cutting 

 points to all the teeth. 



Anthinus multicolor, Rang. 



Jaw thick, greatly arched, ends attenuated, striate; no anterior ribs; no 

 median projection to cutting edge. 



Lingual membrane (PL XI, fig. A) with 40-1-40 teeth; base of attachment 

 very long, reflection small, with a short blunt cutting point; no side cusps 

 or cutting points. 



Pacliyotus eg r eg ins, Jay. Brazil. J. G. Anthony. 



Jaw not examined. 



Lingual membrane (PL XI, fig. B. ; the upper margin of the base of at- 



