112 Dentition of Pulmonate Mollusks. 
rounded ; a decided median projection to the cutting edge, marked with 
strong vertical strie. 
Lingual membrane as in other species. (Pl. IX, fig. I.) 
Dentellaria perplexa, Ker. Island of Grenada. Goy. Rawson. 
Jaw with a median projection to its cutting edge, The anterior surface 
js of irregular thickness, showing some approach to the ribbed form of jaw. 
(LAI, QW, alee, “40.)) 
Lingual membrane as usual. Central and lateral teeth with short, stout, 
blunt cusps. Marginal teeth quadrate, with one wide, stout, bluntly rounded 
median cusp, and two small, blunt siae cusps. (Pl. IX, fig. J.) 
Dentellaria lychnuchus, Mull. Guadeloupe. Mr. A. Schramm. 
Jaw (Pl. XVI, fig. U) arched, ends blunt, cutting margin with a broad, 
blunt, median projection; strong vertical striz and transverse lines of re- 
inforcement, and subobsolete ribs, which denticulate the upper margin. 
Lingual membrane as in the other species. (Pl. LX, fig. K.) 
Pleurodonta. 
The jaw is decidedly costate. Lingual membrane much as in 
Plagioptycha and Dentellaria. 
Pleurodonta acuta, Lam. Jamaica. 
Jaw arched, thick, ends blunt, attenuated; anterior surface with seven 
distant, stout ribs, denticulating either margin. 
Lingual membrane (PI. X, fig. A) with 40-1-40 teeth as above; the mar- 
ginal figured has only one long, oblique cutting point. 
Pleurodonta Chemmitziana, Pfr. Jamaica. Mr. Robert Swift. 
Jaw stout, arched, ends attenuated, blunt ; anterior surface with about 
six irregularly disposed ribs, stout and denticulating either margin. 
No lingual membrane received. 
Pleurodonta Carmelita, Fér. Jamaica. Mr. Robert Swift. 
Jaw arcuate, ends blunt, anterior surface with about six stout ribs, den- 
ticulating either margin. 
Lingual membrane (PI. X, fig. B) as usual in the genus. Central teeth 
short, bluntly pointed on the middle cusps, the side cusps subobsolete; lat- 
erals like centrals, also with obsolete side cusps and cutting points; mar- 
ginals low, wide, with an inner large, oblique, bluntly trifid cutting point. 
Pleurodonta Schroeteriana, Pfr. Jamaica. Mr. Vendreyes. 
Jaw not examined. : 
Lingual membrane (PI. X, fig. C) as in other species. 
Pleurodonta invalida, Ad. Jamaica. Mr. Henry Vendreyes. 
Jaw not examined. 
Lingual membrane (Pl. X, fig. D) as in the other species. Centrals and 
laterals short and stout. 
