Dentition of Pulmonate Mollusks. Ill 



Lingual membrane (PI. IX, fig. A) long and broad, with 47-1-47 teeth. 

 Base of attachment long and narrow in centrals, a line of reinforcement 

 near its upper margin ; reflected portion small, stout, with a short, stout 

 median cusp bearing a short, stout cutting point, no side cusps or cutting 

 points; first laterals like the centrals, but asymmetrical; outer laterals with 

 side cusp and cutting point ; marginals low, wide, with one large, inner 

 bluntly bifid cutting point and one outer small bifid cutting point. 



Dentellaria Isabellas Fer. Barbadoes. Gov. Rawson. 



Jaw striated vertically and horizontally, with about eight well-defined 

 ribs dentieulatiug either margin. 



Lingual membrane (PI. IX, fig. B) as above. 



Dentellaria dentiens, Fer. Dominica. Mr. Guppy. 



PI. IX, fig. C, gives full details of the changes of the teeth from centrals 

 to marginals, especially the side cusp and cutting point of the outer 

 laterals, and the transition from laterals to marginals; teeth 33-1-33. 



Jaw (PI. XVI, fig. N) with 4-5 stout ribs dentieulatiug either margin. 



Dentellaria nucleoid, Rang, Martinique. Gov. Rawson. 



Jaw thick, arched, ends blunt; cutting margin with an obtuse median 

 projection ; one central, stout rib, dentieulatiug either margin. (PI. XVI, 

 fig. O.) 



Lingual membrane as usual in orUcicaia. (PI. IX, fig. D.) 



Dentellaria nuxdenticulata, Chemn. Martinique. Gov. 

 Rawson. 



Jaw (PI. XVI, fig. V) stout, arched, ends blunt; blunt median projection 

 to cutting edge; one stout, well-developed rib on the centre of the jaw, and 

 three less developed, separated, on either side of it. 



Lingual membrane (PI. IX, fig. E) as in the other species. 



Dentellaria pacliygastra, Gray. Guadeloupe. Mr. Schramm. 

 Jaw PI. XVI, fig. P; stout, slightly arcuate, ends blunt; anterior surface 

 with about seven irregularly disposed ribs; both ends free from ribs. 

 Lingual membrane V P1. IX, fig. F) as in the other species. 



Dentellaria betdia, Fer. 



Jaw stout, arched, ends blunt: eight decided ribs. (PI. XVI, fig. Q.) 

 Lingual membrane (PI. IX, fig. G) as in other species. 



Dentellaria formosa, Fer. Antigua. Mr. Robert Swift. 

 Jaw arched; ends blunt ; several strong, transverse lines of reinforce- 

 ment, but no ribs; a median projection to cutting edge. (PI. XVI, fig. R) 

 Lingual membrane as usual in the genus. (PI. IX, fig. H.) 



Dentellaria Josephinm, For. Guadeloupe. Mr. Schramm. 

 Jaw (PI. XVI. fig. S) stout, ribless, horseshoe-shaped, ends bluntly 



