66 LAND AND FKESHWATER 



about four times its breadth, and must also cover a very large surface 

 of shell when fully extended. The extremity of the foot is square, 

 with a mucous gland overhung by a large lobe [fig. 2 «]. The genera- 

 tive orifice is just behind and a little below the right eye-tentacle 

 [fig. 2], The generative organs are the same as in DurgeUa assa7nica, 

 there being no amatorial organ. The spcrmatheca is long and small, 

 expanding at the end into a large pear-shaped sac. The albumen- 

 gland is large and graniilar ; but I failed to trace out the herma- 

 phrodite duct and ovo-testes. 



" Odontophore [figs. 4, 4 a, 4 6]. The buccal mass is large and 

 broad, with a broad lingual ribbon, extremely brittle, so that I was 

 unable to get it out complete ; it consisted of rows of similar and 

 equal-sized teeth ; however, I was fortunate enough to secure the 

 central portion. A very minute central bicuspid tooth [fig. 4], 

 succeeded by much-curved bicuspid laterals, the first on either side 

 of the central being slightly shorter than the second ; thence and 

 outwards there is no change in form, except that those further 

 removed nearer the margin show the pectiniform edges so charac- 

 teristic of the odontophore in D. levicula [fig. 4 i]. The jaw [fig. 3] 

 is straight, with a slightly convex central margin, by no means of 

 solid form, and longitudinally striate." 



I was indebted to my friend Mr. Geoffrey Nevill for the first 

 examples of this species in spirit sent to me in 1881, and afterwards 

 to my brother Harold, of the Civil Service, who served for many 

 years in the Andaman Islands. There is a large slug-like form yet 

 to be collected there, for he described to me the finding of one on 

 one occasion, when working his way on an elephant through the 

 forest and jungle into the hills. Having nothing to put it in, it 

 was wrapped up in a leaf, but it got swept off the pad and was lost. 

 It is very desirable to obtain a coloured drawing of D. cliristiance 

 from life, and it is to be hoped some future malacologist visiting 

 these islands will be able to do this. The species was first described 

 on shell-character alone by Mr. Theobald. In his Catalogue of 

 1876 it is placed in a Section C of the genus Helicarion. The five 

 sections into which this genus is therein divided are quite artificial, 

 based on shell-characters, which in those slug-like forms are of no 

 value whatever *. 



DuRGELiA? suMBAENsis, n. sp. (Plate LXXIX. figs. 6-8 ^j.) 



Locality. Sumba or Sumbawa, Dongo Mountains, 4500-5000 feet 

 {Doherty). 



Shell depressedly globose ; sculpture none, surface polished and 

 glassy ; colour pale greenish ochre ; spire low ; apex flatly rounded ; 

 suture shallow, adpressed ; whorls 3, very rounded ; aperture 

 broadly lunate : peristome thin ; columellar margin vertical, weak 

 in structure, but slightly reflected. 



Size: maj. diam. 5'7o ; alt. axis 3 mm. 



Largest, broken : maj. diam. 9*0 ; alt. axis 3 mm. 



* For instance, //. hcnsoni, to which H. chrit<Hance is compared in the original 

 description, is in all details of its anatomy closely allied to Macrochlamys. 



