r9g15.] H. B. Preston: Mollusca from Lake Chilka. 295 
While those of the type specimen from Ceylon with which a 
number of Lake Chilka examples fairly agree are— 
Alt. 4°75, diam. maj. I1°5 mm. 
Aperture: alt. 5 mm. 
Nevertheless one race would seem to stand out from all 
others and to be worthy of subspecific rank, while two other 
forms are so distinct as to warrant the accordance of full specific 
status. 
Chrysallida (Mormula) humilis chilkaénsis, subsp. n. 
(Figs. 6, 6a.) 
Shell differing from the typical P. (M.) humilis, Preston, in 
its less tapering, shorter and proportionately broader form, finer 
transverse costulae, coarser spiral striae and more oblique aper- 
ture. 
Fic. 6.—Chrysallida (Mormula) humilis chilkaensts, subsp. n. x 8. 
64.— 5 ” ” (sculpture) X 12. 
7.—Chrysallida (Mormula) ecclesia, sp.n. X 4 
7a.— hae iG (sculpture) x 8. 
8.—Chrysallida (Mormula) nadtensts, sp.n. X 
8a.— 6 ; G (sculpture) X 12. 
Alt. 3:25, diam. maj. 1°75 mm. 
Hab.—Serua Nadi, 5-9 ft. (Type); main channel W. of 
Satpara Id., 3-8 ft.; southwards from Mahosa, 5-9 ft.; channel 
between Barnikuda and Satpara, 6} ft.; Nalbano and channel 
S.E. of Nalbano, 4-8 ft.; Mahosa, southwards towards sandhills, 
4-8 ft.; channel from Satpara towards Barnikuda, 9-12 ft.; off 
Barnikuda, inside lake, 6 ft. 
Chrysallida (Mormula) ecclesia, sp. n. 
(Figs. 7, 7a.) 
Shell subulately fusiform, tapering, reddish brown; whorls 
84, regularly increasing, not very convex, sculptured with rather 
closely-set, perpendicular, transverse plicae, crossed by fine, spiral 
lirae; suture impressed; columella descending in a curve, porcel- 
