Zoological Society. 63 



Melania episcopalis. M. testa plicatd, turritd, subcrassd, 

 tenebroso-castaned ; spird elevatd ; suturis impressis ; anfrac- 

 tibus subconvexis,prope suturatn superior em concavis ; plicis raris, 

 subacuminatis ; aperturd magnd, ellipticd, intus ccerulescente ; 

 columella contortd. 

 Hab. A sluggish river, Malacca. 

 Length 2*4, diam. "8 of an inch. 



Remarks. — This is a remarkable and interesting species, and differs 

 from anv which has been described, in having rather large and 

 somewhat distant folds rising on the upper part into nodular points, 

 in all the four specimens submitted for examination. The apex of 

 these specimens being truncated, the number of whorls cannot be 

 ascertained. A perfect adult would probably present about ten. The 

 folds are distinct on the four lower whorls only. On the middle of 

 the lower whorl there is a slightly elevated line, below which are about 

 six obscure strise. The aperture is large, and more than one-third the 

 length of the shell ; it is twisted, and has an elongated base. The 

 columella is whitish and very much incurved. The operculum is 

 more spiral than usual, and the polar point more toward the 

 centre. 



Melania blatta. M. testa plicatd, elongate conoided, crassd, 

 castaneo-nigricante ; spird elevatd, crebre costatd ; anfractibus 

 planulatis, infra suturas concavis ; plicis crebris ornatis ; aper- 

 turd magnd, ovatd, superne angulatd, ad basim rotunda, intus 

 ccervled ; columella tortd, superne incrassaid. 

 Hab. Rapid river and small streams, Luzon, Philippines. 

 Length 2*6, diam. "7 of an inch. 



Remarks. — A very dark-coloured and remarkably fine species, 

 with numerous, nearly parallel, perpendicular folds, which number 

 some eighteen or twenty, and exist on every whorl in the eight speci- 

 mens under examination. The four large ones are truncate, but the 

 younger and more perfect would indicate the existence of about ten 

 whorls. It differs from the episcopalis in being more attenuate, in 

 having more folds and a much less twisted columella. The aper- 

 ture is large, and rather more than one-fourth the length of the 

 shell. 



Melania costellaris. M. testd plicatd, superne striata, acu- 

 minata, subcrassd, tenebroso-castaned ; spird elevatd ; suturis line- 

 aribus ; anfractibus decern, subplanulatis ; anfractu ultimo magno, 

 geniculato ; plicis numerosis ; aperturd pared, dilatatd, ovatd, 

 superne angulatd, ad basim rotundd, intus ccerulescente ; columella 

 incurvd. 

 Hab. Small streams in the islands of Negros, Tanhay, Siquijor ; 

 Philippines. 



Length To, diam. - 5 of an inch. 



Remarks. — The last whorl being angular gives this species a pe- 

 culiar and remarkable character, and causes a channel immediately 

 below the suture. Several of the specimens under examination have 

 beautiful delicate impressed lines immediately above the sutures. In 



