294 LIEUT.-COL. H. H. GODWIN-AUSTEN ON THE 



mantle (l.s.l.), which is reflected over the edge of the peristome. 

 Left neck-lobe (l.d.l.) moderate. The length of an animal with 

 a shell 0*4 in major diam. was 075 inch. 



The foot below has a distinct central area, the perambulatory 

 portion; the margin of the foot regularly segmented, both on the 

 outside and viewed from below. 



Generative Organs. — Neither the ovotestes, hermaphrodite duct, 

 nor albumen-gland have I been able to make out in the spirit- 

 specimens. 



The spermatheca (PI. XXI. fig. 1) is short, thick and wide at the 

 base, with a narrow neck above, and a swollen rounded terminal 

 portion (vide Conulema, Stoliczka). The amatory organ large, 

 being twisted in form from its position in the spire of the shell ; at 

 the anterior end it terminates in a well-developed, pointed, cylin- 

 drical knob, which is thehomologue of the dart, and which is con- 

 tained in a large expanded muscular sac. 



The penis has an expanded portion below the point where 

 the retractor muscle is attached ; and in one specimen this was 

 developed into a csecuin-like process, which probably represents 

 the " Kalksac " in other forms ; there is another convolution near 

 and below the junction of the vas deferens. 



The odontophore (PL XXI. figs. 3, 3 a) is very broad, as described 

 in the generic description ; the central tooth is very minute, aud 

 so hidden by the larger laterals, that I have only been able to see it 

 once. The lingual ribbon is extremely brittle, and generally parts 

 upon the central line. It is very difficult to see the whole side of 

 the odontophore at once and count the teeth ; and I have not 

 been able to count the number of rows, but they are considerably 

 over a hundred. There must be at least 34,000 to 35,000 teeth. In 

 Conulema mfula Stoliczka records 30,000, in C. attegia 40,000: their 

 extreme minuteness is shown by four medians occupying only 0"0005 

 inch ; five laterals the same space. The jaw (PI. XXI. fig. 5) is'-044 

 inch in length, very thin and membranaceous, nearly straight in 

 front, with a very slight rise in the centre, convex above ; muscular 

 impressions striate from side to side, and arching sharply near the 

 central portion ; far less strongly formed than in MaerocUamys &c. 



Dukgella assamica, n. sp. (Plates XX. & XXL) 

 Locality. Paniputer tea-garden, near Tezpur, Assam ; only two 

 specimens received (Zumsden). 



Shell very thin and membranaceous, imperforate, depressedly 

 conoid. Sculpture quite smooth, with some slight, indistinct, 

 oblique shallow ribbing on the third whorl. Colour olive-brown. 



