Zoological Society. 143 



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, suhfu- 

 siformi, suhtenui, corned; spird granulatd, acuminatd ; suturis 

 irregulariter impressis ; an/ractibus novem, convexiusculis , ad 

 basim striatis ; aperturd submagnd, ovatd, intus albidd ; columelld 

 albd tortdque. 

 Hah. 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. M. testd granulatd, conicd, fusiformi, tenui, dia~ 

 phand, vel corned vel fused, rufo-maculatd ; spird depressd, gra- 

 nulatd ; anfractibus sex, subplanulatis, ad basim striatis ; suturis 

 irregulariter impressis ; aperturd magnd, ellipticd, intus vel al- 

 bidd vel fused; columelld tortd. 

 Hah. 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. M. testd granulatd, elevato-conicd, crassd, 

 tenebrosofuscd ; spird elevatd, crebre granulatd ; anfractibus 

 planulatis, ad basim striatis ; suturis irregulariter impressis ; 

 aperturd parvd, ellipticd, constrictd, crenulatd, intus tricostatd, 

 ad basim canaliculatd ; 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. 



