192 
with fewer strize and costz. This looks like an immature shell. The 
aspect of these three varieties is quite different, but I do not consider 
it safe to separate them into species. The aperture is rather more 
than one-fourth the length of the shell. The operculum is large, 
having several revolutions, and the polar point is near to the centre. 
MELANIA CRENIFERA. M. testd granulatd, acuto-conicd, subfu- 
siformi, subtenui, corned; spird granulatd, acuminatd ; suturis 
irregulariter impressis; anfractibus novem, convexiusculis, ad 
basim striatis ; aperturd submagnd, ovatd, intus albidd ; columella 
albd tortdque. 
Hab. Small river in Java. 
Length ‘9, diam. °4 of an inch. 
Remarks.—Three specimens under examination are all nearly co- 
vered with granules, a fourth has but few. It is a very symmetrical 
little species. The aperture is rather more than one-third the length 
of the shell. No opercula accompanied these specimens. 
MELANIA NANA. UM. testd granulatd, conicd, fusiformi, tenui, dia- 
phand, vel corned vel fuscd, rufo-maculatd ; spird depressd, gra- 
nulatd ; anfractibus sex, subplanulatis, ad basim striatis ; suturis 
irregulariter impressis ; aperturd magnd, ellipticd, intus vel al- 
bidd vel fuscd ; columella tortd. 
Hab. Mountain streams, isle of Negros, Philippines. 
Length °6, diam. *3 of an inch. 
Remarks.—The colour varies in this species owing to the number 
of brown spots, which differ much in different specimens. One of 
those under examination is horn-coloured, with a few distinct brown 
spots; another is quite dark in consequence of the multiplicity of 
them. The largest granules are immediately below the suture, and 
the line there is disposed to be of lighter colour. The aperture is 
about one-half the length of the shell. 
MELANIA TESSELLATA. WM. testd granulatd, elevato-conicd, crassd, 
tenebroso-fuscd ; spird elevatd, crebre granulatd ; anfractibus 
planulatis, ad basim striatis ; suturis irregulariter impressis ; 
aperturd parvd, ellipticd, constrictd, crenulatd, intus tricostatd, 
ad basim canaliculaté ; columelld subrectd. 
Hab. ? 
Length 1:10, diam. *4 of an inch. 
Remarks.—There is nothing striking in the general appearance of 
this shell ; but in looking into the interior, there will be observed a 
character which has not been known to exist in any other species— 
three elevated, revolving ribs, terminating short of the outer lip. 
The columella is simple, nearly straight, and ends in the angle at the 
sinus. These remarkable ribs may involve a difference of organic 
structure of the animal, in which case a new genus would be required 
for this species. One of the three specimens is entirely white inside, 
the other two have dark bands. The apex being eroded in them all, 
the number of whorls cannot be ascertained, probably about nine. 
The aperture is about one-third the length of the shell. The oper- 
culum has its polar point near to the lower margin. 
