586 Records of the Indian Museum. [Voi,. VIII, 



succumbed. I put these last in spirit at once and examined the 

 anatomy. It was somewhat surprising to find that the genitalia 

 were not exactly like those of true Macrochlamys, the jaw and 

 radula also differing. 



Animal : foot dark coloured with a distinct overhanging 

 small lobe above the mucous gland ; close black mottling on the 

 mantle zone and wall of the branchial cavity, paler on the line of 

 the rectum. 



Right shell lobe small, dark coloured ; left shell lobe very 

 small. No amatorial organ and only an indication of the coiled 

 caecum to the penis. One spermatophore was found in this first 

 specimen examined, only the long flume, with numerous bifid 

 spines on one side. 



Radula (pi. liv, fig. 10). The median and admedian teeth very 

 elongate, the laterals curved with outer notch much below the 

 point, the outermost minute, narrow and aculeate. Formula: 

 50.2. 13. 1. 13.2.50, it may be noted this differs from No. 3156. Jaw 

 (fig. 10) narrow with a slight curve, no central projection, 



Macrochlamys burkilli, n, sp. 

 (Plate li, figs. 13, I3«; pl- Hv, figs. 8, 9.) 



Locality. — Sadiya, Eastern Assam, No. 6125. No. 5917, Kobo, 

 in spirit (S. W . Kemp). 



Shell globosely conoid, flat on base, imperforate; sculpture 

 none, smooth, glassy: colour very pale ochraceous ; spire high; 

 apex rounded; whorls 5, closely wound; aperture semilunate; 

 columellar margin very oblique. 



Size: major diameter 7'25. minor 7*0, alt. axis 3*5 mm. The 

 largest specimen in spirit (No. 5917) measures maj. diam. 90, minor 

 875, alt. axis 4'25. 



I have named this after Mr. Burkill, who was Botanist with 

 the expedition, and who I note collected some shells for Mr. Kemp. 



The animal, removed from the shell, has a band of black ex- 

 tending from the rectum backwards, and on the mantle margin the 

 apical whorls pale ochraceous. There is a very small right shell 

 lobe, situated low on the right side of the right dorsal lobe; the 

 left shell lobe was not made out, it is probably very small as in 

 M. rotungensis and easily broken oft'. 



In the generative organs (pl. liv, fig. 8), the retractor muscle 

 is very short, attached to the circumference of the coiled caecum, 

 the epiphallus is long as is also the kale-sac or flagellum, the 

 sheath of the penis is also much lengthened. The spermatheca 

 and amatorial organ greatly developed, the first bulbous towards 

 the free end ; it contained a single spermatophore with a long 

 flume. 



The radula central tootb and admedians of typical shape, the 

 marginal long narrow unevenly bicuspid, outermost ver}^ minute, 

 also bicuspid. Formula: 24.2.9.1.9.2.24 or 35.1.35. 



