Dentition of Pulmonale Mollusks. 101 



short cutting points ; laterals like the centrals, but bicuspid and asymmetri- 

 cal; the outer laterals have the inner cutting point bluntly bifid; marginals 

 a modification of the laterals, low, wide, with one inner, large, blunt, bifid 

 cutting point, and one outer smaller. 



Strophia mumia, Brag. Abaco, Bahamas. 



Jaw slightly arcuate, stout, rough, rather high, ends but little attenuated, 

 blunt ; cutting edge with a wide, blunt, slightly developed median pro- 

 jection. 



Lingual membrane (PI. VII, fig, B) with about 30-1-30 teeth, as in the 

 last species. There is a line of reinforcement to the lower margin of the 

 base of attachment of the central and lateral teeth. 



Stro])hia iostoma, Pfr. 

 Jaw as in other species of the genus. 



Lingual membrane (PI. VII, fig. C) not differing from that of the allied 

 species. Teeth about 29-1-29. 



Cionella. 



Cionella Gloynei, Gibbons. Curasao. Mr. J. S. Gibbons. 

 Jaw and lingual membrane, as usual in Sienogyra. 

 PI. VII, fig. E, represents the central and first lateral teeth. 



Csecilianella. 



Ccecilianella Gundlachi, Pfr. St. Martin. Dr. II. E. Ky- 

 gersma. 



Jaw low, (PI. XVI, figs. F, G,) wide, slightly arcuate, ends attenuated ; 

 whole surface covered with about 22 crowded, broad, flat ribs, denticulating 

 either margin. 



Lingual membrane (PI. VII, fig. F) long and narrow. Teeth 18-1-18, 

 with four perfect laterals. Centrals with their base of attachment long, 

 narrow, their reflected portion about one-half the length of the base of at- 

 tachment, tricuspid; the middle cusp stout, with a short blunt cutting point, 

 side cusps subobsolete, but with small, distinct cutting points. Lateral 

 teeth with their base of attachment subquadrate, much longer, and very 

 much broader than that of the centrals, the reflected portion short, stout, 

 tricuspid, the middle cusp very stout and long, reaching the lower edge of 

 the base of attachment, beyond which projects the short, stout cutting- 

 point; side cusps subobsolete, but bearing distinct, though small cutting 

 points. There are four perfect laterals, the fifth tooth being a transition to 

 the marginals, by the base of attachment being lower, wider, not exceeding 

 the reflected portion, with one inner large cusp bearing one outer large cut- 

 ting point representing the outer cutting point of the first four lateral teeth 

 and one inner, still larger, cutting point, representing the middle cutting 



