OF CONCIIOLOGY. 29T 



DESCRIPTION OP A NEW SPECIES OF COLUMNA. 



BY GEOKGE W. TRYOX, JPw. 



CoLUMXA Leai, Tryon. — Plate 20, fig. 1. 



Descrijjtioii. — Shell elongate-fusiform, sinistral, smooth, some- 

 what thick ; whorls 6, obliquely revolving, increasing grad- 

 ually and somewhat convex, but broadl}^ flattened on the pe- 

 riphery, which in the last whorl is somewhat impressed ; apex 

 obtuse ; suture crenate margined, not deep ; aperture small, 

 narrow-ovate, the labrum with a slight revolving white callus. 

 Yellowish, with oblique zig-zag longitudinal brown stripes. 



Dimensions. — Length QQ, diam. 19 mill.; length of aperture 

 23, width 9 mill. 



Habitat. — Prince's Isle, W. Coast of Africa, fDr. J. Wilson, 

 U. S. N.) 



My Cabinet. Cabinet of Isaac Lea. Cabinet of the Academy 

 of Natural Sciences of Philadelphia. 



Ohservations. — But three species of this genus have been 

 previously described — the typical one, G.flammea, Martyn, 

 with which this has probably been confounded, C. eximia, 

 Shuttleworth, and G. Hainesi, Pfeiff'er. 



G. eximia, an inhabitant of Madagascar, is dextral, wants 

 the longitudinal reddish-brown flames which ornament the 

 other species, and in other respects differs so much, that, 

 uniting to these points its geographical position, it may fairly 

 be questioned whether it appertains at all to the genus Calumna. 



The other species — -flammea, Hainesi., and Leai — are all sin- 

 istral, and are inhabitants of Prince's Island.* They resemble 

 one another closely in coloration and markings, but differ in 

 the following particulars: — -flammea and Leai are drawn-out 

 species, with the whorls flattened in the middle, while Hainesi 

 is a smaller shell, more conical, more convex, and with some- 

 what angulate periphery. G.fiammea is at once distinguished 



* I take great pleasure in dedicating this species to Mr. Lea, to whom I 

 owe the opportunity of describine; it. I have since found a specimen iu 

 the collection of the Academy of Natural Sciences, sent by a London con- 

 chologist, under the name of C. flammea. 



