222 Certain Terrestrial Pulmonata 



JPwpa §iaila5«lt«ft, Mullek (Gonidomus). 



Lingual membrane long and very narrow. Rows of teeth arranged en 

 chevron. Teeth separated, aculeate, as in Pwpa palanya Lesson, photo- 

 graphed by us (Amer. Jour. Conch. V, pi. xi, tig. 1.) 



We obtained no jaw on boiling the buccal mass in a solu- 

 tion of caustic potash. 



This species belongs to the genus Gonospira^ in which 

 P. palanga was placed by Crosse and Fischer (Journal de 

 Conch. IX, 213 (1869), pi. xi, figs. ()-8). 



The specimen examined, sent from Mauritius hy Consul 

 Pike, was kindly supplied by Mr. John G. Anthony. 



Sifiliiuiis fiiaEatcostjIws, Pfr. (Euryms). 



Lingual membrane as usual in the genus, the marginal teeth simply 

 modified from the laterals. 



Jaw slightly arcuate, membranous, almost transparent, in one single 

 piece, but divided by delicate ribs into more than sixty plate-like sections, 

 as common in the genera Bulimnlns, Cylindrella, etc. No upper median 

 triangular plate, but the ribs run somewhat obliquely to the centre. 



We are indebted for this specimen from St. Lucia, and 

 for the following from St. Viilcent, to Governor Rawson. 



BailfliMias aaiu'is-sileMa, Born {Pelecychilus). 



Jaw and lingual membrane as in the last species. The middle cusp of 

 the central teeth and inner cusp of the lateral teeth long, acute. 



The jaw of this and the preceding species do not agree 

 with the generic description of von Martens "costis validis 

 exarata," but are like ihwi o^ Bidimulus. This fiict gives 

 still more proof of the difficulty of classifying the Bidhni 

 by their jaw, at the present stage of our knowledge of the 

 subject, as already remarked by Fischer (Jour, de Conch. 

 Xli, 295, 1872). 



