PRUNUM. 29 



First described by Sowerl\y as M. crassilflbrum, a name pre- 

 occupied by both Lea and Conrad for fossil species, and therefore 

 changed as above ; subsequently Jousseaume, ignorant of 

 Redfield's work, called it M. Leai. Dr. Weinkauff confounds 

 M. crassilabrum , Sowerby, with M. crassilabrum, Reeve the 

 latter a synonym of M. marginata, Born. 



M. GIBBOSA, Jousseaume. PI. 8, figs, 55, 56. 



More gibbous than M. labroxa, the columella with six or seven 



plications. Length, 12 mill. 



Habitat unknown. 



Differs somewhat in form from the last species, and in having 

 more than four colnmellar folds t yet, I doubt its distinctness. 



M. KEENII, Marrat, PI. 8, fig. 5T. 



Color orange-buff', somewhat translucent ; columella four- 

 plaited ; outer lip thickened, smooth within. Length, 12 mill. 



So. Africa. 



I am unacquainted with this species. 



M. PULCHRA, Gray. PL 5, figs. 61, 68. 



Yellowish flesh-color, with two narrow faint red bands. 



Length, 1 inch. 



West Indies. 



Larger than M. Olivaeformis^ the aperture conspicuously 

 channeled behind, the bands of color narrower and more 

 regular. Appears to connect the foregoing W. African group 

 with that of M. prunum, of the West Indies. M. Honduf&ifensis, 

 Reeve (fig. 68), is a juvenile shell. 



M. PRUNUM, Gmelin. PI. 8, figs. 58-61 ; PI. 9, fig. 62. 



Light olivaceous or yellowish white, sometimes very faint!}' 

 banded ; lip-margin usually bordered exteriorly with orange, lip 

 and columella white, interior chestnut-brown. 



Length, 1-T5 inches. 



Wes f Indies ; Panama; Sierra Leone? ; Brazil. 



With this species 1 unite M. mpotilla, Hinds, from Panama 

 (fig. 62); M. Burchardi, Dunker (fig. 60), locality unknown; 

 and M. Martini, Petit ifig. 61), from Rio Janeiro. The original 

 figure of M. sapotilla, which I have copied, represents a young 

 shell ; similar dark-colored specimens' of this age occur among 



