1916.] H, H. Godwin-Austen : Mollusca, VI. 553 



10 mm. of the extremity ; pi. xlviii, fig. i shows the packing of the 

 alimentary and generative organs viewed from the right side. The 

 penis is seen extruded from the generative aperture, this took 

 place probably when the animal was put alive into the spirit. I 

 have attempted to show its relative position to the rest of the 

 genitalia when it is thus extended externally. The amatorial 

 organ is present, not seen in fig. i, being below and on the other 

 side, but in pi. xlviii, figs. 2 and 3 of the generative organs removed 

 and more spread out, it is long and cylindrical. The spermatheca 

 is an elongate sac, better seen in pi. xlviii, fig. 3 than it is in fig. i. 

 The heart, branchial cavity and the hermaphrodite gland and 

 duct lie immediately under the shell, separated from the rest of 

 the internal organs by a thin diaphram (pi. xlviii, fig. 4). 



Comparing the anatomy of Dihangia koboensis with that of 

 Girasia hookeri, of the Khasi Hills, very distinctive, considerable 

 and interesting differences are found, vide Moll. India, plate 

 Ixxxviii, figs. 2—2i, particularly noticeable in the position of the 

 liver and intestines. These in the first genus are situated near 

 the extremity of the foot, in the second they are underneath the 

 shell and mantle. 



Another specimen was obtained at Sadiya (No. 5906), it is 

 figured on plate xlvi, figs. 4, 4a, 46, the shell has been removed 

 and the contraction of the animal differs much from the figures 

 on plate xlv. 



Kobo is not in the mountainous Abor country but on the 

 north bank of the Brahmaputra, 20 miles west of Sadiya. 



Genus Galongia, nov. 



Galongia kcmpi, n. sp. 



(Plate xlvi, figs. 3, 3« ; pi. xlviii, figs. 6 — 10). 



Locality. — Rotung, 3r-xii-ii, common under stones (5. W . 

 Kemp), 



Shell (pi. xlviii, figs. 7, ya) minute, flat, spatulate, embryonic, 

 seen from below it is solid not concave, and this represents, it 

 seems to me, the protoconch ; sculpture smooth, lines of growth 

 onl}'; colour pale ochraceous, white on apex; whorls only one; 

 aperture very large and expanding, thin. 



Size : maj. diam. 2*7 mm. 



Description of animal when alive, by Mr. S. Kemp of his 

 Slug D. 



*' General tone almost black, a very dark warm livid brown 

 with very obscure black mottling. Margin of sole, in dorso-lateral 

 view, indistinctly barred vertically with warm brown and black. 

 When fully extended the anterior part of the body, immediately 

 in front of the mantle, rather pale brown." 



The animal (pi. xlviii, fig. 6), preserved in spirit, which was 

 drawn measures 20 mm. but is much contracted, it is probably 

 when fully extended 40 mm., the largest sent is 24 mm. and was 



