94 Dentition of Pulmonale Mollusks. 



ribs, with a strong transverse line of reinforcement. The jaw resembles 

 that of ClauslUa or Papa more than that usually found in Helix. 



Lingual membrane as usual in the IMicidw. Centrals short, and stout, 

 with a blunt cutting point to the central tooth; the cusps obsolete. Laterals 

 with a very long, oblique, blunt inner cutting point; the outer cutting point 

 obsolete. Marginals subquadrate, with several short, blunt, cutting points. 

 (PI. II, fig. J. ) 



Oriitliephila. 



In this genus, again, the presence or absence of ribs on the 

 jaw is not a reliable character. 



Ochthephila tiarella, Webb and Broil. Madeira. Dr. Hil- 

 lebrand. 



Jaw low, slightly arcuate ; ends scarcely attenuated ; anterior surface with 

 about 15 flat, broad, crowded ribs, scarcely denticulating the cutting margin. 



Lingual membrane with 21-1-21 teeth, of same character as figured in 

 Plebecula lurida. About nine laterals on each side of the median line. 



Ochthephila abjecta, Low. Madeira. Dr. Hillebrand. 



Jaw low, slightly arcuate; ends attenuated; cutting edge with a blunt 

 median projection; no anterior ribs. 



Lingual membrane with 24-1-24 teeth, about four on each side being per- 

 fect laterals, characterized as in the last species. 



Cysticopsis. 



The jaw described under C. tumida is peculiar. There is 

 considerable difference in the dentition of the two species 

 examined. 



Cysticopsis tumida, Pfr. 



Jaw (PI. XVI, fig. A) wide, low, slightly arcuate, scarcely attenuated at 

 the blunt ends ; a slight, broad, median projection to the cutting edge ; 

 with delicate, separated, longitudinal striae, passing into a long, narrowing, 

 conical prolongation of the jaw, springing from about the centre of its sur 

 face, and distinct from the muscular attachment of the jaw. 



Lingual membrane (PI. V, fig. A) with 22-1-22 teeth. Centrals very 

 broad, with a small reflection bearing three distinct cusps and cutting points. 

 Laterals like the centrals, but bicuspid and asymmetrical. Marginals low, 

 wide, with one inner, larger, cutting point, and one outer, smaller, bifid 

 cutting point. 



Cysticopsis pemphig odes 9 Pfr. Cuba. 

 Jaw not examined, 



Lingual membrane (PL V, fig. B) long and broad. Teeth as in Pkujiop_ 

 iycha, not as in Cysticopsis tumida. 



