1875.]  LIEUT.-COL. BEDDOME ON NEW LAND-SHELLS. 445 
OpiIsTHOSTOMA DISTORTUM, 0. Sp. 
Shell irregularly rhomboidal, pale-coloured, with an oblique rather 
distant costulation ; whorls 4, excentric, the upper one very minute 
and depressed, not visible from a side view, so that the shell appears 
as with only three convex whorls, second whorl moderate, third or 
penultimate much larger than the second or fourth, lowest whorl 
constricted as usual, and in front of the constriction deflected 
upwards, but not concealing the umbilicus; aperture subangularly 
circular, pointing upwards, its apex in a line with the apex of the 
shell; peristome touching the upper part of the penultimate whorl, 
double, the lips not much dilated and with little space between 
them: total length 54 inch, greatest breadth 5+; inch. 
Golcondah hills, Vizagapatam, 174° N. lat., elevation 3000 feet, 
rare; by far the smallest species yet known. Only one specimen 
was found, and this is now with Mr. Blanford, or has been mislaid ; 
and the description is from notes and a rough drawing made at the 
time it was collected. 
CyaTHopoMa (JERDONIA) NITIDUM, n. sp. (Plate LII. fig. 12.) 
Shell inconspicuously umbilicated, pyramidal, turreted, smooth, 
shining, of a yellowish olive tint, apex rather obtuse, sutures deep, 
a very minute oblique striation is generally visible under the lens; 
whorls 5, convex, smooth, the lowest scarcely descending towards 
the aperture; aperture circular; peristome continuous, single, thin ; 
operculum double, thick, surrounded by a sulcate margin, exter- 
nally very slightly concave; the nucleus very large, half the 
diameter of the circle, very thin, transparent, shining, destitute of 
whorls, the outer portion externally shelly, internally membrana- 
ceous, furnished with an exquisitely close spiral sculpture: length of 
shell varying from 4, to 1 inch, breadth of lowest whorl 4, inch. 
Anamallay mountains, 6000 feet elevation. South-Canara ghats, 
4000 feet ; a shell of very simple structure, closely allied to Cyclo- 
stoma trochlea, Bens. (Jerdonia, Blanford), but without any carina- 
tions, and a much smaller umbilicus; the operculum is very similar, 
but with a larger transparent nucleus and much more closely 
wound. 
The operculum of Cyathopoma wynadense, procerum, and kolamal- 
liense, is very similar to that of this shell, only differing in being a 
little more concave externally ; so I propose that these species should 
be referred to Jerdonia, which, however, can, I think, only be kept 
up as a subgenus. 
The operculum of Mychopoma hirsutum and limbiferum is quite 
that of C. wynadense and its allies, and only thicker in proportion 
to the size; there is the same transparent nucleus destitute of spiral 
whorls, and the same outer calcareous texture ; and they must, I 
think, also be referred to the Jerdonia section of Cyathopoma. 
The operculum of filocinctum, the type of Cyathopoma and its 
allies (i.e. deccanense, kalryenense, malabaricum, and conoorense), 
is at first sight very different; the margins of the outer shelly 
portion are much dilated and partially arched over, leaving a wide 
