1876.] 311 



XYII. — On the Helicidse collected during the Expedition into the Dafla 

 Sills, Assam. — By Major H. H. GtOdwust- Austen - , F. B. G. >S'., 

 JF. Z. S., Sfc, Deputy Supierintendent Topographical Survey of 'India. 



This list contains nearly all the sjoecies of Etelicidcc that were obtained 

 during the Expedition of 1874 — 75. 



There are still a few that have not yet been determined : they will be 

 worked out and those of them that prove to be new described by Mr. Gr. 

 Revill, from the series presented by me to the Indian Museum. 



I was in hopes that Mr. Nevill would have been able to join me in 

 completing the list ; but his many other duties and late unavoidable absence 

 from Calcutta have prevented this, and as the plate must appear now, I am 

 compelled to give it thus incomplete. 



Helix lttbkica, Bs. ? Plate VIII, Fig. 9. 



Until I had examined the animal I should have supposed it to possess 

 the usual truncate glandular form at the extremity of the foot. It shews 

 how carefully we should examine the living animals before grouping these 

 very similar forms of Btelicidce, and how much has to be done in this direc- 

 tion. I give a description and drawing of this species. 



Animal— fore part of foot and head, as well as the tentacles, dark slate, 

 extremity of foot pointed (no gland visible), pale grey, edged light fleshy, 

 sole of foot dark orange, mantle very slightly reflected in front, with no 

 tongue- shaped process, — it is, in fact, very similar to that of Vitrina. 



Length, 2-0", tentacles 0-5". Shell-major diam. 0'95". 



Hab.— Shengorh Peak, 7000 ft. 



Helix (Nantna) biliotiata, n. sp., Plate VIII, Fig. 8. 



Shell globose, very thin, transparent, greenish yellow. Whorls 5, spire 

 conoid. The living shell appears mottled on the upper surface with black 

 and white from the body of the animal shining through its thin and trans- 

 parent walls. 



Animal — the foot pale ochraceous ; tentacles black, the black extending 

 on to the neck as two very conspicuoiis well-defined parallel lines ; the upper 

 part of the foot has also two parallel black fines. From the right anterior 

 margin a long tongue-like process is given off, which reaches, when fully 

 extended, up to the apex of the shell, as in the large form, Nomina decussata. 



Hab. — Tanir Lampa ridge,- 4000 ft. Very abundant in the forest 

 among the fallen leaves. 

 40 



