52 DESCRIPTION OF NEW 
I very much regret that the operculum did not accompany this specimen, suspecting, 
as I do, that it will be found to differ from the genus Me/ania, and be somewhat like 
M. transversa, which I propose above to bring into this group. The operculum of this lat- 
ter species was described by me as having the polar point near the centre, and having 
five revolutions. * 
Bastsroma Epwarpsu. PI. XXX. Fig. 1. 
Testa striata, turrita, subcrassd, geniculatd, tenebroso-corned; spird valdé attenuata; suturis valdé im- 
pressis; anfractibus planulatis; superné impressis, lineis crebrissimis instructis; apertura subgrandi, 
elliptica, intus albida, ad basim valdé abscissa; columella levi tortaque. 
Shell striate, turreted, rather thick, geniculate, dark horn-colour; spire very much drawn out; sutures very 
much impressed; whorls flattened, impressed above, thickly covered with revolving lines; aperture rather large, 
elliptical, white within, at the base abruptly cut off; columella smooth and twisted. 
Hab. River Tocatinus, South America, Amory Edwards, Esq. 
My cabinet. 
Diam. .50, Length 1.92, of an inch. 
Remarks.—This very beautiful and interesting shell is remarkable for the new form it 
presents in the aperture. It is thickly striate all over the whorls, and looks like a suc- 
cession of coils of rope piled on each other. The two lower whorls are impressed above - 
the middle, which gives it a geniculate character immediately below the suture. Between 
the strie there are very minute sculptured points. The apex being eroded, the number 
of whorls are not ascertainable, but they are probably about ten. The outer lip is very 
sharply edged, and the central portion very much extended on a curve. The aperture is 
about one-fourth the length of the shell. 
The form of this species reminds one of Achatina columna (Lymnea columnaris, 
Lamarck,) which is however, a land shell. It is drawn out like it and has flattened 
sides, with a cut at the base of nearly the same form. In other characters they are not 
at all alike, the colwmna being sinistral, covered with granules, much larger and belong- 
ing to a different genus altogether. 
I dedicate this fine species to my friend Mr. Edwards, to whom I am indebted for it 
and many other interesting shells from the waters and banks of the Amazon. 
Merania perstriata. Pl, XXX. Fig. 2. 
Testa striata, acuto-conoidea, subtenui, cinnamomeo-bruned ; spira elevata, subattenuata, ad apicé carinata 
et granulata ; suluris impressis ; anfractibus septenis, convexis; apertura parva, ellipticd, ad basim angulata, 
intus rufa; columellé levi. 
Shell striate, acutely conical, rather thin, cinnamon-brown; spire elevated, somewhat attenuate, at the apex 
carinate and granulate; sutures impressed, whorls seven, convex; aperture small, elliptical, angular at the base, 
reddish within; columella smooth. 
* Proceedings Zoological Soc., London, 1851, p. 187. 
