66 Zoological Society. 



Hab. Guiana. 



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



Remarks. — This species is remarkable for the unusual obliquity of 

 its aperture and its auger-shaped lip. In its ribs and decussate striee 

 it resembles the group consisting of" M. tornatella, M. rudis and M. 

 microstoma, but it has not the emarginate lip and therefore does not 

 belong to them. The emargination at the base of the columella is 

 quite a different character, and is very remarkable in this species, 

 representing as it does the bite of the auger. The chestnut-coloured 

 spots are small, but so distinct as to mark the interior of the shell, 

 which is white and thick. The two specimens under examination are 

 both truncate at the apex, and the number of whorls not ascertained, 

 probably about ten. The aperture is rather more than one-fourth the 

 length of the shell. The operculum is spiral, with the polar point 

 nearly in the centre and with at least five revolutions, which is un- 

 usual with Melanice. It is allied to M. truncata, Lam. {semi'plicata, 

 Fer.), but is less cylindrical and differs somewhat in the aperture. 



Melania maxima. M. testd striata, elevato-conoided, crassd, 

 corned ; spird valde. elevatd ; suturis linearibus ; anfractibus duo- 

 decim, planulatis ; striis magnis , raris,tenebrosis; aperturdmagnd, 

 rhomboided, intus albidd ; columelld valde contortd. 

 Hab. Copan, Central America. 

 Length 3, diam. 1*1 inches. 



Remarks. — This very large species has a remarkable outline, form- 

 ing a perfectly regular, rather obtuse cone above. The aperture is very 

 large, and in the youngest of the three specimens the coloured striae 

 are very distinct within. Under the microscope minute revolving 

 lines may be observed over all the whorls. The aperture is rather 

 more than one-third the length of the shell. The operculum has 

 five revolutions and is very much like that of M. transversa, the 

 polar point being nearly central. 



Melania Mindoriensis. M. testd striatd, elevato-conoided, sub- 

 tenui, pallidd, ad apicem acuminatd ; spird elevatd ; suturis impres- 

 sis ; anfractibus duodecim, subconvexis, striis crebris ; aperturd 

 magnd, ellipticd, intus albd ; columelld incurvatd tortdque. 



Hab. Small streams, Puerto Galero, isle of Mindoro, Philippines. 



Length 1*9, diam. '7 of an inch. 



Remarks. — The outline of this species is very regular, tapering to 

 a fine point. There are five specimens under examination, all of 

 which have raised striee over the whole of the body whorl. Some of 

 the specimens have the two next whorls ribbed, which ribs, the striee 

 decussating, form granular elevations. The remaining whorls are 

 perfectly smooth, with a few delicately impressed transverse lines. 

 Some have brown spots, which towards the apex are more numerous 

 and flammate. The aperture is more than one-third the length of 

 the shell. The operculum has its polar point on the lower edge, and 

 the curved lines of growth do not make one-eighth of a revolution. 



Melania indefinita. M. testd striatd, elevato-conicd, sub- 



