1h | 
Q4 Dentition of Pulmonate Mollusks. 
ribs, with a strong transverse line of reinforcement. The jaw resembles 
that of Clausilia or Pupa more than that usually found in Heli. 
Lingual membrane as usual in the Helicide. 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, 
CP, INE, ile, df.) 
‘ Ochthephila. 
In this genus, again, the presence or absence of ribs on the 
jaw is not a reliable character. 
Ochthephila tiarella, Webb and Broll. Madeira. Dr. Hil- 
lebrand. 
Jaw low, slightly arcuate; ends scarcely attenuated; anterior surface with 
about 15 flat, broad, crowéled ribs, scarcely denticulating the cutting margia. 
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 ©. twmida is peculiar. ‘There is 
considerable difference in the dentition of the two species 
examined. 
Cysticopsis tumida, Pir. 
Jaw (Pl. XVI, fig. Aj 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 (Pl. 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 pemphigodes, Pfr. Cuba. 
Jaw not examined, 
Lingual membrane (PI. V, fig. B) long and broad. Teeth as in Plagiop_ 
tycha, not as in Cysticopsis tumida. 
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