50 PROCEEDINGS OF THE ACADEMY OP 



inner, long, oblique, bluntly bifid denticle, and two outer, short, 

 blunt denticles. 



Helix angulata, Fer. {Eurycratera) . 



Poito Rico. From the late Mr. Robert Swift. 



Jaw stout, dark claret-colored, low, wide, ends blunt ; about 1, 

 very wide, crowded, decided ribs, bluntly deuticulating either 

 margin. 



Lingual membrane as in the H. ci'ispata (plate X., fig. 9), as far 

 as the general arrangement of the teeth, but there are decidedly 

 developed points to the side cusps of both centrals and laterals; 

 we have therefore figured it (plate IX., fig. 5). 

 Helix Texasianna, Mor. [Polygyra). 



Bosque Co., Texas. Mr. H. W. Ericsson. 



Jaw wide, low, slightly arcuate, ends blunt, with 10 decided 

 ribs, deuticulating either margin. 



Lingual membrane (plate V., fig. 1) as usual in the subgenus. 

 Centrals and laterals with a plate about as wide as high, the 

 former tricuspid, the latter bicuspid, cusps long and slender, with 

 long, sharp points. Marginals low, wide, raultidentate, the two 

 inner denticles long, the several outer denticles short and slender. 

 Of the same type as figured by us for H. auriculata in L. and Fr. 

 w. Shells, L 8t. 

 Helix Luquillensis, Shuttl. (Polydontes). 



The lingual was received mounted from the late Mr. Robert 

 Swift. 



Lingual membrane (plate X., fig. 2-4) as usual in the Helicidse. 

 Centrals tricuspid, laterals bicuspid, cusps with long, sharp 

 points, extending beyond the ba«e of the plate. Marginals bicus- 

 pid, cusps short, bluntly rounded, the inner one, as usual, the 

 longer. 



We received no jaw of this species. 



Helix notaMlis, Shuttl. (Thelidomus) . 



Tortola. Received mounted from the late Mr. Robert Swift, 

 Jaw arcuate, low, ends blunt ; narrower at the centre ; decided 

 separate ribs, deuticulating either margin. 



Lingual membrane already published by us. (Am. Journ. 

 Conch., VL nt ; see also plate IX., fig. 10). Centrals tricuspid, 

 laterals bicuspid, the plates about as wide as high, the larger 

 cusp with a long point extending beyond the lower margin of the 



