60 LAND AND FRESHWATER 
GLeEssuLA (RIsHeria) SUNDERI, N. sp. 
Locality. Amin Gaon, Gowhathi, Assam. Only one example 
(Sunder Lall Hora). Type in Indian Museum, Calcutta. 
Shell very elongately turreted; sculpture: smooth to eye, rather 
distant striation in low relief, the first two embryonic whorls 
smooth; colour pale umber-brown; spire long, very regularly 
tapering, apex fine; suture well impressed; whorls 14, sides flatly 
convex, proportion of last whorl to length, 100 : 32-5; aperture 
narrowly ovate; peristome simple, thin; columellar margin 
concave, sharply truncate. 
Size: maj. diam. 9°5; alt. axis 41°5 mm. 
This is a beautiful and new species, the single specimen is in 
most perfect state. Its nearest ally is G. baculina, Hy. Blandford, 
of Darjiling, compared with which it differs in its greater length 
and number of whorls, 14 to 13, and general tumidity, more 
convex whorls, with suture more impressed, sculpture not so full, 
side of spire not so straight and flat, last whorl larger and more 
swollen. 
Compared with G. subaculina, G.-A., of the Khasi Hills and 
South Jaintia, another near ally, it differs considerably as follows: 
It is much longer, 14 whorls to 14, length 41 to 34:75 mm.; more 
alternate with finer apex; tapering very regularly, side of spire 
quite straight: sculpture far less pronounced ; columellar margin 
shorter and with more convexity. Considerable interest is attached 
to the finding of this Glessula at Amin Gaon, 400 yards from the 
Railway Station, where Sunder Lall of the Indian Museum, 
returning from Munipur, was detained for six hours ; he made tlie 
best of the opportunity, obtaining at the same time six specimens 
of another Glessula, a variety of sarissa. 
Regarding the range of G. baculina, it is of interest ; 400 miles 
east of Darjiling, at the base of the Dafla Hills, 450 feet, I found 
that G. harmuttiensis took its place; the apex is more obtuse and 
the sculpture is very different from that of Hy. Blanford’s 
species. It comes from a low elevation compared with Darjiling ; 
Harmutti is some 150 miles east from Gowhathi; 50 miles north 
of that place, near Dewangiri, at the base of the Bhutan Hills, 
the Datla species, or one very close to it, in all probability is 
to be found, indicative of the area and side trom which G. sunderi 
was derived. The intrusive granite at Gowhathi extends thence 
for some distance north, exposed and rising at intervals above 
the deep alluvial of the Bramaputra, which evidently covers 
much more, pointing to a once close connection of low hilly 
country, by which land-mollusea could travel far out into the 
plain of Assam. Such former connection with the Assam Range 
or the Khasi and Garo Hills is more pronounced between Gowhathi 
and Dubri, trending towards the great mass of granite of Gipmochi 
Peak into the Western Bhutan Hills (see also page 11). 
