1870.] Contributions to Indian Malacology, No. XI. 13 



rotunda ; peristoma obtusum, marginibus disjunetis, externo antice arcua- 

 to, basali expansiusculo, columellari sub-late expanse, umbilicum omnino 

 callo complente. Operc. testaceum, intus membranaceum, paucispirale, 

 margine inter no anfractuum elevato, nucleo exeentrico. 



Diam. maj. 12, min. 11, axis 9, ap. diam. 6 mm. 



Hab. in Kathiawar. (W. Theobald.) 



From Cyclostoma ( Otopoma) clausum, Sow., to which. Mr. Benson 

 referred the present form, it is distinguished by being much smooth- 

 er, with a less excavated umbilical region and a higher spire. 



I have not previously published a complete description or figure 

 of this shell. It is the most eastern form of the sub-genus known, 

 other forms assigned to Otopoma found in the Indian and Burmese 

 areas having been shewn to belong to the Cyclophoridce. 



6. Nanina plicatula, sp. nov., Pi. Ill, fig. 7. 



Testa vix perforata, depressa, tenuissima, cornea, confertim striatula, 

 lineis minutis confertissimis spiralibus sub-lente undique decussata. Spira 

 depresso sub-conica ; apice obtuso ; sutura parum impressa. Anfr. 6 con- 

 vexiusculi, sensim accrescentes, penultimus extus ad suturam plicatus, 

 ultimus carina e^tlicis obliquis validis constante instructus, subtus twnidior, 

 antice non descendens. Apertura fere verticalis, rotundato-lunaris, ad 

 finem peripherics vix angulata ; peristoma tenue, marginibus convergen- 

 tibus, externo infra medium leviter sinuato, columellari sub-verticali, 

 superne refiexo, perforationem fere tegente. Diam. maj. 22, min. 19., 

 axis 11 mm. Apert. 10 mm. alta, 12 lata. 



Hab. in montibus Khasi (Grodwin-Austen.) 



This shell which I suppose to be a Nanina, is quite peculiar 

 amongst Indian forms, and I do not know any to which it can be 

 compared, nor am I quite clear as to its proper section. It may 

 be easily distinguished by its strong plicate keel. 



7. Nanina Pollux, Theobald, var. 



Testa perforata, depressa, lenticularis, acute carinata, tenuis, cornea, 

 nitida, striatula, lineis spiralibus minutissimis sub-lente, fere obsolete, 

 decussata. Spira depresso-conica; apice obtuso ; sutura linearis. Anfr. 5%, 

 intus convexiusculi, extus concaviusculi et colore saturation, ultimus juxta 

 carinam compressus, subtus convexus, non descendens. Apertura obliqua 



