NEW MELANIDiE OF THE UNITED STATES 343 



clouded appearance, while in the interior, usually, the bands are well marked and 

 sometimes number as many as eight, but sometimes the aperture is entirely white; 

 rarely the whole is purple inside, in which case the exterior is very dark brown' 

 The base of the columella is usually yellowish outside. It is somewhat allied to 

 Melania (Goniobasis) Goosaensis (nobis), but that species is more constricted and 

 has a narrow aperture. The aperture is nearly one-half the length of the shell 

 I name this species after Mr. G. W. Tryon, Jr., who has done much to promote 

 the objects of the study of malacology.' 



Goniobasis Postellii. PL 38, fig. 208. 



Testa granulata, attenuate, subtcnui, luteo-oliva, inferno transverse striata ; spira elevata; suturis irre-rihri- 

 ter impress ; anfractibus subplanulatis, instar octonis ; apertura parva, elliptic*, intus vel albida vel 

 vittata-; labro acuto ; columella torta. 



Shell granulate, attenuate, rather thin, yellowish-olive, transversely striate below ; 

 spire raised; sutures irregularly impressed; whorls rather flattened, about eight;' 

 aperture small, elliptical, white or banded within ; outer lip sharp; columella twisted.' 

 Melania Postellii. Proc. Acad. Nat. Sci. July 6, 1858. 



Hob.— Altamaha River, Georgia, James Postell, Esq. 



My cabinet and cabinet of Mr. Postell. 



Diam. -36, T ,, , n „ . . 



' . Length 1-06 inch. 



Kemarles.— Some dozen specimens were received from Mr. Postell, which were all 

 more or less covered with a black deposit of oxide of iron, but underneath the epider- 

 mis was quite perfect, and of a light horn-color. Most of the specimens have four or 

 five brown bands, but others are entirely without them, while others, again, are alto- 

 gether deep purple inside. It has a very close resemblance to Melania ( Goniobasis) 

 cahgmosa (nobis), but that species is cancellate, the cancellation not amounting to 

 granulations as in Postellii. It is also near to catenaria, Say, from South Carolina, 

 but that shell is quite cancellate. I name this after James Postell, Esq., of St! 

 Simon's Island, to whom I owe the acquisition of many fine mollusca, from Georgia 

 Pine specimens were subsequently sent to me by Dr. Wilson, of St. Simon's Island, 

 procured in Lewis' Creek. 



Goniobasis granata. PI. 38, fig. 209. 



Testa granulosa, inferne striata, fusiformi, vittata, subcrassa, fulgida, inflata, olivacca vel rubiginosa • 

 spira depressa ; suturis irregulariter impressis ; anfractibus instar quinis, planiusculis, ultimo pergrandi • 

 apertura grandi, ovato-rhomboidea, intus valde vittata; labro parum crenulato, viz sinuoso; columella 

 incurva et contorta. 



Shell granulose, striate below, fusiform, banded, rather thick, shining, inflated 

 olivaceous or reddish ; spire depressed; sutures irregularly impressed ; whorls about 

 five, ilattish, the last one very large; aperture large, ovately rhomboidal, much 



