Dentition of Pulmonate Mollusks. 111 
Lingual membrane (Pl. 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 Isabelle, Fer. Barbadoes. Gov. Rawson. 
Jaw striated vertically and horizontally, with about eight well-defined 
ribs denticulating either margin. 
Lingual membrane (Pl. IX, fig. B) as above. 
Dentellaria dentiens, Fer. Dominica. Mr. Guppy. 
Pl. 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 (Pl. XVI, fig. N) with 4-5 stout ribs denticulating either margin. 
Dentellaria nucleola, Rang. Martinique. Gov. Rawson. 
Jaw thick, arched, ends blunt; cutting margin with an obtuse median 
projection ; one central, stout rib, denticulating either margin. (Pl. XVI, 
fig. O.) 
Lingual membrane as usual in orbiculata. (Pl. TX, fig. D.) 
Dentellaria nuxdenticulata, Chemn. Martinique. Gov. 
Rawson. 
Jaw (Pl. 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 (P]. LX, fig. E) as in the other species. 
Dentellaria pachygastra, Gray. Guadeloupe. Mr. Schramm. 
Jaw (Pl. XVI, fig. P) stout, slightly arcuate, ends blunt; anterior surface 
with about seven irregularly disposed ribs; both ends free from ribs. 
Lingual membrane (Pl. IX, fig. F) as in the other species. 
Dentellaria badia, Ker. 
Jaw stout, arched, ends blunt; eight decided ribs. (PI. XVI, fig. Q.) 
Lingual membrane (PI. IX, fig. G) as in other species. 
Dentellaria formosa, Per. Antigua. Mr. Robert Swift. 
Jaw arched; ends blunt; several strong, transverse lines of reinforce- 
ment, but no ribs; a median projection to cutting edge. (Pl. XVI, fig. R.) 
Lingual membrane as usual in the genus. (PI. IX, fig. H.) 
Dentellaria Josephine, Fer. Guadeloupe. Mr. Schramm. 
Jaw (Pl. XVI, fig. S) stout, ribless, horseshoe-shaped, ends bluntly 
