342 ACHATINID^. 



Sf.ennr/yru octona, Peile, Jourii. Bombay Nat. Hist. Soc. xii, 1909, 



p. 785. 

 Subu/wn crotallaria (Schumaclier), ^liircli, Jourii. C'oiiclivl. 1872, 



p. 3.37. 



On'r/inal descrijition : — "Bulitnus, testa cylindrica,tuiTita, cornea, 

 aufractibus octo, apice obtnso. 



" La coquille ii'est point ombiliquee ni perforce, elle est cvlin- 

 drique, turriculce, rousse, transparente et composee de huit tours 

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

 sommet de la spire est obtus ou arroiidi, il est ordinaireuient ])lus 

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

 ficie est luisante et marquee de quelques stries lougitudinales, 

 ecartees, qui sont les traces des accroissemens successifs de la 

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

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

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

 iongue que large, elle est un pen oblique, ar'rondie a son extromite 

 inferieure et retrecie au bout superieure. La levre droite est 

 simple, fcros 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, j^ellowish 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." (Pilshri/.) 

 Length 15-0-19, diam, 4-4'5 mm. 



Bah. India: T ranquehnv {Spe7i(/ler iide MiJrch); Ji omh^y [PeUe, 

 Beddome coll.). Ceylon [Colletf). 



" 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 l-8xl"5 mm." 

 [Pilsbri/.) 



Suhnlina 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, haviug apparently followed in the wake of tropical and 

 subtropical cultivation. Prof. Pilsbry has examined numerous 

 specimens from the West Indies, Xorth 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. 



