106 Dentition of Pulmonale Mollusks. 



» 

 Fruticicola. 



See Terr. Moll., V, for F. rufescens and hispida. • . 

 Fruticicola pubescens, Pfr. Haiti. Mr. V. P. Parkhnrst. 



Jaw (PI. XV, fig. H) thin, semitransparent, low, slightly arcuate, ends 

 scarcely attenuated, blunt ; upper margin with a strong muscular attach- 

 ment ; no median projection to cutting edge ; anterior surface with about 

 twenty ribs denticulating either margin ; these ribs appear in most cases to 

 be broad, flat, with narrow interstices, but in others there are ■ appearances 

 such as I have described in Bulimulus limnoeoidcs v see below . 



Lingual membrane long and narrow (PI. VI, fig. J). Teeth as usual in the 

 Helicince. The change from laterals to marginals is very gradual, not formed 

 by the splitting of the inner cutting point. The 12th tooth (figured) shows 

 the commencement of the transition. The 22d (figured) is a marginal tooth. 

 The inner cutting point of the marginals is rarely bifid. Teeth 24-1-24. 



Dorcasia. 



There is wide variation in the characters of the jaws in this 

 genus. For D. griseola, Pfr., see Terr. Moll., V. 



Dorcasia similaris, Fer. Brazil.. J. G-. Anthony. 



Jaw arched, ends not attenuated, blunt ; anterior surface with eight sepa- 

 rated ribs, denticulating either margin. 



Lingual membrane (PI. VI, fig. L) long, with unicuspid centrals and 

 laterals; marginals low, wide, each cusp bifid. 



Dorcasia globulus, Mull. 



Jaw low, wide, scarcely arcuate, ends not acuminated; no anterior ribs. 



Lingual membrane (PL VI, fig, M) with about 40-1-40 teeth ; teeth with 

 almost square bases of attachment; both centrals and laterals are very dis- 

 tinctly tricuspid.; marginals a simple modification of laterals, the broad 

 cutting point trifid. 



Both by jaw and lingual dentition this does not agree with the other spe- 

 cies of Dorcasia examined. 



Tarrieula. 



For T. terrestris, see Terr. Moll., V. 



Turricula tuberculosa, Conr. Palestine. A dried specimen 

 in Mr. Bland's collection. 



Jaw with numerous, crowded, broad, flat ribs, denticulating either 

 margin. 



Lingual membrane (PL VI, fig. N) long and narrow. Teeth 28-1-28; 

 centrals and laterals without decided side cusps or cutting points, but the 

 central cutting point has a decided lateral bulge ; marginals low, wide. 



