Pere HS CR ee TOS ORI NEW SEEE LS IN 
fives nC Onley s, Cctel © Ne sO i THE INDIAN 
MUSE UM.~F ROseere RMAS SEAM <AND,. THE 
BAY OF] BEN GAL. 
By -He BY PRESTON» .Z.S. 
Plectotropis biggtet, sp. nov. 
Shell broadly conic, carinate at the periphery, rather solid, 
reddish brown; whorls 7, regularly increasing, covered with a 
laminiferous periostracum and transversely sculptured with closely 
set, oblique, transverse wrinkles, the last whorl descending; base 
of shell presenting a curiously granular appearance; sutures im- 
pressed ; umbilicus very wide, deep ; columella descending somewhat 
vertically, inflated in the middle ; peristome white, reflexed, the 
margins joined by a very thin callus and bearing a very slight 
thickening just below the columella ; aperture subquadrate. 
on 
L 
Fic. 1.—Plectotropis biggiet, sp. nov. 
Altitude Eger Gh nits 
Diam., major Bie (02715 peek 
Aperture, alt. 3 ¥5 
a diam. eae » 
Hab.—Pitsamloke, Siam. (H. D. Biggie, Esq.) 
Type in Indian Museum (Reg. No. M. 245). 
Differing chiefly from P. ptychostyla, von Marts., its nearest 
ally, in its more conical shape, deeper and much wider umbilicus, 
narrower aperture, in being less keeled at the periphery and by 
the granular sculpture which is absent in P. ptychostyla. 
Opeas innocens, sp. nov. 
Shell bluntly subulate, whitish, thin; whorls 8, flat, rather 
Sharply shouldered above and below, transversely striate with 
