MOLLtJSCA OF INDIA. / 



accepted as true Olessida. The animal of Glessula ochracea, G.-A., 

 of Sikhim, has been dissected and published in ' llecords iudiaa 

 Museum,' vol. viii. pt. xii. p. 617. It was found to agree with 

 G. oroiihila as described by Semper. Until many of the smaller 

 species are anatomically examined, they must all be placed in 

 Glessula ; the smallest species, such as G. geimna. may possibly 

 have characters ot subgeneric value. 



The classification as given in « Fauna British India,' vol. ii. (vide 

 Systematic Index, p. x) requires modification. Bncilhim is placed 

 in the Achatinidie subfamily Steiioi/i/rince, whereas Glessula is 

 put in the Family Ferrusacidoe Genus 3. I can tind very little 

 difference between the animals of Glessula and Bacillum (January 

 ]9:;0), and consider the first should come next the other ia the 

 Stenogynnce. 



Conch. Ind. p. 17, " the subgenus Bacillum is proposed by 

 Mr. Theobald for this {A. olAusa, Blf.), the preceding {A. cassiaca, 

 Bs.), and other allied forms." 



It was lelt to Mr. Henry A. Pilsbry to describe the Genus 

 couchologically, which be does in Man. Conch, ser. 2, xviii. lyuG, 

 p. 1, as follows. Ho mentions 4 species and L sulispecies. 



Bacillum. — " Shell rather large, solid, imperforate, turreted, 

 niany-whorled, a little contracted near the obtuse, rounded summit; 

 the embryonic shell cylindric ; sculiiture of vertical rib-strise 

 beginning somewhere upon the first whorl (PI. i. fig. 12) ; the post- 

 embryonic whorls being obliquely, regularly nb-striate. Aperture 

 oblique, Achatinoid, the columellar concave, truncate at the base, 

 outer lip simple. Internal axis slender, strongly sigmoid within 

 each whorl. Soft anatomy unlsnown. 



" Type, B. cassiacum. Distribution, Eastern India." 



The very recent and extended knowledge of the animals of 

 Bacillum and Glessula shows that the two genera come next 

 each other ; further, that the animals of the latter present two 

 very distinct divisions. This was first seen on dissecting a 

 well-known species from Darjiling and Sikhim long known as 

 G. tenuispira in early Catalogues, such as ^Nevill's ' Hand-list.' 

 The specimens dissected came from the Kishelchu, a tributary of 

 the Teesta, and the anatomy is figured on Plate CLXV. figs. 1-1 c. 

 On this I found a new Subgenus, with the following characters: — ■ 



Subgenus Eishetia, nov. 



Shell large, thin, transparent, imperforate, turreted, many- 

 whorled, tapering gradually to a rather acute embryonic apex, 

 first 2 whorls smooth ; sculpture regular, rather coarse striation. 

 Aperture oblique, columellar concave, truncate at base. 



Animal. Uvotestis tightly convoluted, close to the albumen 

 gland. Prostate and oviduct compact cylindrical, with closely- 

 packed follicles. Spermatheca large on long duct. Penis with a 

 distinct simple gland or flagellum retractor muscle on side. 



It is also apparent, with the gradually accumulating knowledge 

 of the animal combined with form of the shell, the genus Glessula 

 admits of subdivision — Glessula as a subgenus to include all those 



