6o2 Records of the Indian Museum. [Vol. YIII. 



** Manual of Conchology " under Eulota. In this excellent work of 

 Mr. H. A. Pilsbry, 2nd Series (Pulmonata), p. 208, under section 

 Plectotropis , commenting on Prof. Wiegmann's work and figures 

 of P. sumatrana and P. rotatoria, Pilsbry very truly says: 

 *' Until adult examples are examined I do not venture to 

 '* transfer this species especially since a vast majority of the 

 *' forms of both groups are still anatomically unknown, and their 

 *' systematic position consequently is only arbitrarily fixed by 

 " slight and obscure shell features." Thus Thysonota (p. 207) may 

 be removed, vide L. and F. W. Moll. India (1907), p. 189, which 

 no doubt Mr. Pilsbry has already done. 



In this section of the Helicidae, there is a general similarity in 

 the radula, vide Man. Conch, pi. 65, fig. 14 {Plectopylis vulvivaga), 

 and pi. 63, fig. 3 {Eiilotella similaris), but great differences are 

 found in the generative organs, and the dart-sac is a conspicuous 

 feature, vide pi. 66, figs. 33, 34 for the first, and pi. 66, fig. 20 for 

 the second. 



Among the long list of species of the section Plectotropis given 

 by Pilsbry, I note the following from India and Burma and Borneo. 



akotitongensis, Theob. Pegu 



emensus, Q.A. Burma. P.Z.5. i888,p 242. 



mitanensis, G.A. Tenasserim. /l.M.iY./Z". 1869, p. 108. 



grumulus, G.A. Borneo. P.Z.S. 189 1, p. 43. pi. v, fig. 2. 



pudica, G.A. Labuan. P.Z.S. 1891, p. 43, pi. ii, figs. 7, ya. 



huttoni, Pfr. N.-W. Himalaya. Symb. Hist. Helic. 1842, p. 82. 



=orbicula, Hutt. J.A.S.B. 1838, p. 271. 

 V. savadiensis,'Nev. Sawady, Upper Burma. Hand-list, p. ys, 



1878. Type in Indian Museum. 

 darns, G.A. Burma. P.Z.S^. 1888, p. 242. 

 catosioma, W. Blf. P.Z.S. 1869, p. 447. 

 oldhami, Bens. Burma. .4. M. A^ i^. 1859, p. 185. 

 tapetna, Bens. Khasi Hills. J.A.S.B. 1836, p. 352. 

 rotatoria, Busch. Java. 



Of these I have examined the animal of P. huttoni and am 

 able to give a description of it, and some other species from 

 Sikhim and the Eastern Frontier. 



Many years ago I had noticed how very much the shell of this 

 species differed from very similar looking species from other parts 

 of India and Burma, species which had received very casual 

 attention and had come to be considered alike. I compared all I 

 had, and provisionally named those species I considered distinct. 

 More recently, to obtain some idea of the generic position, I 

 have paid attention to the anatomy of the animals of those I had 

 in spirit, and been able to continue the work, thus verifying their 

 distinctness. 



William Theobald in his " Catalogue of the Land and Fresh- 

 water Shells of British India" (1876) was the first to give this 

 species a very wide distribution; he records "Himalayas, Simla 

 toSikkim; Nilghiri Hills ; Iravadi Valley." 



