-i899.] GENEEA STRBPTAXIS AND EXNEA. YGT 



the last whorl. There are some faint impressed spii'al lines on 

 more than one o£ the Kolamalai specimens. The Torna specimen 

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

 coltunellar. It should perhaps be classed as distinct. 



Steeptaxis sxjbacuttts, sp. nov. (Plate L. figs. 1, 2, 3.) 



Testa arcuatim nmato-perforata, depresso-ovata, solida, Jlcxnose 

 costvJato- striata, suhtus Icevigata ; sjjira depresso-conoidea, ajnce 

 ucutiusculo ; anfr. 6|, planulati, penultimus ad peripheriam 

 obtuse carinatus, dhnidio latitudinis idtra anfractum idtimum 

 jjrojectus, ultimus valde excentricus, suhtus convexiuscuhis, circa 

 uTuhilicum versus aperturam angidatus, in umhiVico rugoso-striatus, 

 post aperturam fossicido lonyitudinali suhhasali impressus ; 

 apertura suhdiagonalis, fere semiovalis, lamellis duohus parie- 

 talihus, una longiore media, altera, juxta angidum hrevi, trihu^s- 

 que dentihus palatalihus, uno dextrali, secundo hasaJi, tertio 

 columellari, coarctata ; peristoma expansum., margine dextrali 

 ad cmgidum sinuato. Biam. maj. 11|, min. 8; alt. 6 mm. 

 Hah. 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 the aperture, as 

 already noticed, it is very difficult to make a key to these, but they 

 may generally be identified by the folloA^Tng : — ■ 



A. Penultimate whorl rounded at periphery. 



a. Parietal lamellae 1 or 2, not Y-shaped, nor joined to 



margin of peristome \>y raised cPvllus. 



a. Shell above smooth or slightly striated. 



a'. Penultimate whorl projecting on lower surface 

 beyond last whorl. 

 a?. Two parietal lamella (one sometimes in & peC' 

 rotteti). 

 a'. Length 8-10 mm. ; usually 3 palatal teeth... S. perrolteti. 



b^. Length 6J mm. ; 1 or 2 palatal teeth S.jootei. 



e'. Length 6 mm. ; 3 to 5 palatal teeth S.watsmii. 



/;^. A single parietal lamella ; length ()-7 mm 8. beddomii. 



b'. Penultimate concealed by last whorl beneath S. concinnus, 



b. Shell costulately striated above S. scalptus. 



b. A single Y-sbaped parietal lamella, arising from raised 



callus that imites margins of peristome. 



a. Smooth ; lower surface of penultimate whorl scarcely 



projecting 8. personatus, 



b. Costulate ; half of penultimate whorl projecting 8. proiius. 



B. Penultima:te whorl keeled. 



a. Costulate. 



a. Length about 11^- mm. ; 3 palatal teeth 8. subacutus. 



b. Length about 74 mm. ; 6 palatal teeth 8. canaricus. 



b. Smooth or striated ; 4 or .7 palatal teeth ,. 5. compressus^ 



