518 MAJOR GODWIN-AUSTEN ON NEW INDIAN SHELLS. ["Mar. 19, 



mantle is continued to the respiratory orifice on the right side. The 

 animal is in all points of structure similar to H. croceus, last de- 

 scribed, but larger by h, an inch ; the shell is very rudimental, major 

 diam. 0*56, minor very narrow ; the apex is well developed and 

 more calcareous, the rest of the shell being a mere thin horny epi- 

 dermis of a pale green colour. 



Although the description of Helicarion agrees fairly with the 

 animal of these Khasi forms, yet I am not satisfied they are gene- 

 rically the same, in which case the genus Hoplites, Theobald, will 

 stand. I have named the above shell after Mr. Theobald, of the 

 Geological Survey of India, who was the first to notice this form of 

 slug ; but as I cannot find any description, I presume that the 

 species now referred to was the one he discovered, for it is very 

 abundant all over the hills even in the winter months. Other 

 smaller species exist ; but I am sorry that I neglected, or had no 

 time, to draw them when taken ; and they do not survive long. 



The largest form in the Khasi hills is Helicarion gigas, Bs., de- 

 scribed as a Fitrina. Of the largest specimen I obtained the animal 

 measured 4 inches in length; shell, major diam. 1*7 inch, minor 

 diam. 1'2 inch. 



9. Helicarion (Hoplites?) solidus, sp. nov. (Plate XXX. 

 fig. 10.) 



Animal not seen. 



Shell flat, periphery oval, solid ; epidermis reddish brown ; spire 

 short, apex very flat ; one single body-whorl ; peristome simple, 

 thin. 



Diam. major - 57, minor 0*32 inch. 



This shell was found at Hengdan Peak, North Cachar hills, and 

 on several occasions during the cold season ; but I never obtained a 

 living specimen. I have, however, figured the shell, with the hope 

 that a description of the animal may some day follow. 



EXPLANATION OF PLATE XXX. 



• 



Fig. 1. Melanoides spinata, nat. size. 

 1 a. Operculum of ditto. 



2. Melanoides hanlcyi, nat. size. 



3. Hydrocena milium, Bs. : qu. young of Pupa plicidens, Bs. ? 



4. Pupa (Ennca) blanfordiana. 



5. stenopylis, Bs. 



6. vara, Bs. 



7. la. Bidimus (Harpalus) khasianus. 



8. ( ) munipurensis, with head of animal. 



9. Helicarion (Hoplitesl) croceus, nat. size. 

 9 a. Animal of ditto, nat. size. 



10. Helicarion (Hoplites?) solidus, nat. size. 



