187 
Hab. Guiana. 
Length T6, 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 strise 
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 Melania. It is allied to M. truncata , Lam. (semiplicata, 
Fer.), but is less cylindrical and differs somewhat in the aperture. 
Melania maxima. M. testa striata, elevato-conoidea, crassa, 
corned; spird valde elevatd ; suturis linearibus; anfractihus duo- 
decim, planulatis; striis magnis, raris,tenebrosis; aperturd magnd, 
rhomboidea, 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 strise 
a,re 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 
fh e re\ olutions and is very much like that of M. transversa, the 
polar point being nearly central. 
Melania Mindoriensis. M. testa striatd, elevato-conoidea, sub- 
tenui, pallidd, ad apicem acuminatd; spird elevatd; suturis impres- 
sis; anfractihus duodecim, subconvexis, striis crebris; aperturd 
magnd, elliptica, intus alba; 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 strise over the whole of the body whorl. Some of 
the specimens have the two next whorls ribbed, which ribs, the strise 
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 fiammate. 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. testa striatd, elevato-conicd, sub - 
