292 LIETJT.-COL. H. H. GODWIN-AUSTEN ON THE 



JD. levicula in the ' Conch. Indica/ pi. xc. figs. 1-4, is a fair repre- 

 sentation of the shell, but over-coloured. 



Mr. Ossian Limborg collected in spirit a very large number of 

 D. levicula on the slopes of the Mule-it range near Meetan, and a 

 number also reached me alive in Calcutta which had been packed 

 in a bamboo-tube. An examination of the animal shows that it 

 is a very distinct genus, having but a distant relationship with 

 Girasia, Macrochlamys, &c, and must be placed in a distinct 

 group of its own. It will be interesting hereafter to see in which 

 direction and to what extent its allied forms will be found to 

 range, the extreme limits now being Assam on the N.W. and 

 Tenasserim on the S.E. ; for among a collection of land-shells, in 

 spirit, most kindly got together by Mr. D. McTavish Lumsden at 

 the tea-factory of Paniputer, near Tezpur, in Assam, during the 

 last rainy season, were two specimens I at first sight thought be- 

 longed to Macroclilamys. On taking them up for examination, 

 I found all the interesting characters again as exhibited in 

 J), levicula ; and I hope to be able to point these out in some 

 degree of detail in the following notes. 



I am very doubtful if mucosa can be placed in this genus : 

 seposita may be, perhaps ; but if, as Mr. Gr. Nevill thinks, 

 seposita is the same as my bilineata from the Dana Hills, then 

 it must also be removed ; for the latter is a true Macroclilamys. 



It is not improbable that the large form Helicarion prcestans, 

 Gould, from Moulmein and other parts of Tenasserim, will find 

 a place in or near this genus, judging from a figure of the animal 

 which was made under the superintendence of Ferd. Stoliczka ; 

 and I wish I could obtain the species in spirit. 



The Additional and Principal Characters of the Genus Durgella. 



1. The right and left mantle-lobes moderate, the shell-lobes 

 very ample ; the right shell-lobe extends from the anal aperture 

 (close to the upper angle of the shell-aperture) to the columellar 

 margin, and spreads away over the shell in a broad triangular 

 tongue ; the left shell-lobe is reflected slightly over the edge of 

 the shell in front, from near the respiratory orifice, and becomes 

 wider on the lower margin as it approaches the umbilicus, and is 

 also of triangular shape when extended. A large portion of the 

 shell is always exposed. 



2. The mucous pore is well developed, with a large overhanging 

 lobe. 



3. The jaw is very thin, membranaceous, almost straight on the 

 xuargin, with a very slight central projection. 



