342 



Stenogyra octona, Peile, Journ. Bombay Nat. Hist. Soc. xii, 1909, 



p. 785. 

 Subulinn crotattaria (Schumacher). Morch, Journ. Conchvl. 1872. 



p. 337. 



Original desertion : "Bulimus, testa cylindrica, turrita, cornea, 

 anfractibus octo, apice obtuso. 



; ' La coquille n'est point ombiliquee ni perforce, elle est cylin- 

 clrique, turriculee, rousse, transparente et composee de huit tours 

 presque applatis, qui sont separes par des sutures profondes. Le 

 sommet de la spire est obtus ou arrondi, il est ordinairement plus 

 transparent que les tours inferieurs et tres fragile. Leur super- 

 n'cie est luisante et marquee de quelques stries lougitudinales, 

 ecartees, qui sont les traces des accroissemens successifs de la 

 coquille. Son epiderme est brun, mais facile a enlever, excepte 

 dans les sutures ou il en reste toujours assez pour y paroitre comine 

 une ligne spirale noiratre. L'ouverture est ovale, une fois plus 

 iongue que large, elle est un peu oblique, arrondie a son extrcmite 

 inferieure et retrecie au bout superieure. La levre droite est 

 simple, tres mince et tranchante, la gauche manque tout-a-fait, 

 mais sa region est lisse, tres luissante et aussi diapbane que les 

 trois derniers tours du sommet." (Bruguiere.) 



"Shell thin, translucent, yellowish corneous, turrited, almost 

 regularly tapering to the obtuse summit, very glossy, rather 

 coarsely and irregularly striatulate. Whorls 9, quite convex, 

 separated by a deeply impressed suture, the first three turns of 

 which are regularly crenulated by a border of short folds. On 

 the later whorls it is also irregularly crenulate in places. Last 

 whorl rounded. Aperture oblique, ovate ; columella concave 

 above, obliquely truncate at its base." (Pilsbry.) 



Length 15-5-19, diam. 4-4-5 mm. 



Hab. India : Tranquebar (Spenyler fide March) ; Bombay (Peile, 

 Beddoine coll.). Ceylon (Collett). 



" Reproduction begins before the shell has attained two-thirds 

 its maximum size, and usually several eggs may be seen through 

 the shell within the penultimate whorl. The egg-capsules are 

 hard-shelled, white and flattened, measuring 1-8x1*5 mm." 

 (PMry.) 



Subulina octona is certainly one of the most widely distributed 

 molluscs, being found not only in the "Western Hemisphere, 

 believed to be its original home, but also in the Eastern Hemi- 

 sphere, having apparently followed in the wake of tropical and 

 subtropical cultivation. Prof. Pilsbry has examined numerous 

 specimens from the West. Indies, North and South America, 

 West Africa, the Seychelles, Ceylon, Sumatra, and Ternate, and 

 he is satisfied of their identity. The species has also been recorded 

 from East Africa, Mauritius, many other East Indian islands, New 

 Caledonia, and as far as the New Hebrides, while its occurrence 

 in hot-houses in Europe and North America lends colour to the 

 theory of its dispersal through cultivation. 



