60 Zoological Society. 



Length 1*6, diam. '5 of an inch. 



Remarks. — In the adult specimens the edge of the aperture is 

 bluish white, and within more or less brown. In all cases the colu- 

 mella is white in the four specimens under examination. They are 

 covered nearly over the whole surface with a black deposit of oxide 

 of iron. Near the base there are seven to ten indistinct striae. The 

 aperture is about one-third the length of the shell. The operculum 

 is ovate, and does not present any peculiar character. 



Melania sobria. M. testd Icevi, acuta -conoided, subcrassd, 

 luteo- corned ; spird elevatd, ad apicem costatd ; suturis impressis ; 

 anfractibus duodecim, planulatis ; aperturd parvd, suhovatd, intus 

 alhidd, ad basim rotundatd ; columella regulariter curvatd. 

 Hah. Very small streams, Siquijor, Philippines. 

 Length 1'5, diam. '5 of an inch. 



Remarks. — A very regularly formed, light-coloured species. There 

 are a few indistinct strise near the base. The sutures are very regu- 

 lar and thread-like. The upper whorls are slightly maculate, and 

 those nearest to the apex minutely plicate. The aperture is rather 

 more than the fourth of the length of the shell, and is rounded at 

 the base of the columella. 



Melania subula. M. testd Icevi, acuto-conoided, tenui, castaned; 

 spird valde elevatd, acuminata ; suturis impressis ; anfractibus 

 duodecim, subconvexis ; aperturd parvd, contractu, intus vel albidd 

 vel rufo- castaned. 

 Hah. Small river in the province of Ho Ho, isle of Panay, Phi- 

 lippines. 



Length 1*8, "diam. '4 of an inch. 



Remarks. — This is a delicately formed species, very much atte- 

 nuated, with six or eight impressed, small striae at the base. In the 

 darker specimens, the upper part of the whorl at the suture is lighter- 

 coloured than the other part. The upper whorls are finely striate. 

 The aperture is small, about one-fourth the length of the shell, and 

 rounded at the base of the columella. 



Melania acus. M. testd Icevi, conoided, subtenui, corned ; spird 

 acuminatd, ad apicem costatd ; suturis subimpressis ; anfractibus 

 undecim planulatis ; aperturd parvd, ovatd, intus ccerulescente ; 

 columelld regulariter curvatd. 

 Hah. Small stream, Guimaras, Philippines. 

 Length 1*1, diam. '3 of an inch. 



Remarks. — This is a regularly formed, small species. The speci- 

 mens under examination are nearly covered with a deposit of oxide 

 of iron, which on removal displays a horn-coloured epidermis. The 

 aperture is nearly one-third the length of the shell, and is rounded 

 at the base. 



Melania dermestoidea. M. testd Icevi, politd, subcylindraced, 

 crassd, tenebroso- castaned ; spird subelevatd ; suturis impressis; 

 anfractibus sex, subplanulatis ; aperturd ovatd, ad basim canali- 

 culatd, intus rufescente ; labro Incrassato. 



