1899.] GENEEA STEBPTAXIS AJSD ENNEA. 767 



the last whorl. There are some faint impressed spiral lines on 

 more than one of the Kolamalai specimens. The Torna specimen 

 has only one parietal lamella and five palatal teeth, two being 

 columellar. It should perhaps be classed as distinct. 



Streptaxis subacutus, sp. nov. (Plate L. figs. 1, 2, 3.) 



Testa arcuatim rimato-jjerforata, depresso-ovata, solida, jJcxuose 

 costulato- striata, siibtus Icevii/uta ; sinra depresso-conoidea , upice 

 acutiusculo ; anfr. Q^, planulati, loenultimus ad peripheriam 

 obtuse carinatus, dimidio latitudinis ultra anfractam idtimum 

 projectus, ultimus valde excentricus, stibtus convexinscidus, circa 

 umbilicum versus aperturam anc/idatas, in umbillco rugoso-striatus, 

 post aperturam fossicido longitudinali sabbasali impressus ; 

 apertura subdiagonalis, fere semiovalis, lamellis duobits parie- 

 talibus, unci longiore media, altera juxta angulum brevi, tribus- 

 qxie dentibus palatalilnis, uno dextrali, secundo basali, tertio 

 columellari, coarctata ; peristoma expansum, margine dextrali 

 ad angulum sinuato. Diam, maj. 11 5, viin. 8; alt. 6 mm. 

 Hab. South Canara (Beddome). 



This is the third and largest species of carinate Streptaxis from 

 Southern India, the two others being S. canaricus and S. compressus. 

 These three species bring up the number of forms described 

 from Southern India to eleven. Owing to the considerable 

 amount of variation, especially in the teeth within th'e aperture, as 

 already noticed, it is very ditficult to make a Ivey to these, but they 

 may generally be identified by the following : — 



A. Penultimate whorl rounded at periphery. 



a. Parietal lamelliE 1 or 2, not Y'shaped, nor joined to 



margin of peristome by raised callus. 



a. Shell above smooth or slightly striated. 



a'. Penultimate whorl projecting on lower surface 

 beyond last whorl. 

 a^. Two parietal lamella (one sometimes in S. per^ 

 rotteti). 

 «l Length 8-10 mm. ; usually 3 palatal teeth... S. perrotteti. 



P. Length 65 mm. ; 1 or 2 palatal teeth S.footei. 



c^. Length 6 mm. ; 3 to 5 palatal teeth S. watsoni. 



Jr. A single parietal lamella; length (5-7 mm S. beddomii. 



b'. Penultimate concealed by last whorl beneath S. coneinnus. 



b. Shell costulately striated above S. scaljptus. 



b. A single Y-sl^aped parietal lamella, arising from raised 



callus that imites margins of peristome. 



a. Smooth ; lower surface of penultimate whorl scarcely 



projecting S. personatus, 



b. Costulate ; half of penultimate whorl projecting S. pronus. 



B. Penultimate whorl keeled. 



a. Costulate. 



a. Length about 11^ mm. ; 3 palatal teeth 8. stibacutus, 



b. Length about 7i mm. ; 6 palatal teeth S. canaricus. 



b. Smooth or striated ; 4 or 5 palatal teeth S, compressus^ 



