Jaw and Lingual Dentition of Pulmonata. 189 



shown the genus to be widely distinct from Succinea, in its 

 jaw, its lingual membrane, and its genital system. 



Sueeinea campestris, Say. 

 St. Augustine, Fla. 



Genitalia as in S. obliqua, Say, figured under the name of S. ovalis, by 

 Leidy, Terr. Moll. U. S., I. pi. xiii. fig. 1-3. 



Succinea pallida, Pfr. 

 Raiatea Isl. Mr. A. Garrett. 



Lingual membrane (pi. xvii, fig. 7) with 30-1-30 teeth, with about 

 eleven laterals, but the change into marginals is very gradual. The figure 

 shows a central, first lateral and a marginal in the fifteenth tooth. 



Jaw as usual in the geuus : no anterior ribs. 



Succinea papillata, Pfr. 

 Huahine Isl. Mr. A. Garrett. 



Jaw as usual : no anterior ribs. 



Lingual membrane (pi xvii, fig. 6) with 25-1-25 teeth; nine laterals, 

 the tenth tooth having its inner cutting point bifid. Some of the outer 

 laterals have their outer cutting point bifid. 



Tornatellina aperta, Pease. 

 Huahine Isl. Mr. A. Garrett. 



Among the species received from Mr. Garrett were two 

 of this genus, T. aperta, Pse. and T. oblonga, Pse. I did 

 not succeed in extracting the jaw of either. With the 

 lingual membrane I was more fortunate, which is the more 

 satisfactory from the fact of the dentition being quite similar 

 to that which Mr. Bland and myself have described for 

 Achatinella, s. s., Partulina, etc., sub-genera of Achatinella 

 (Ann. Lye. N. H. of N. Y., X. 331). From the exceeding 

 minuteness of the individual teeth I find great difficulty in 

 counting the cutting points. They seem to be about eight, 

 in the form of regular denticles, not of unequal size as in 

 Achatinella, 



