MITRELLA. 133 



suture ; aperture obliquely oval ; labrum thickened and well 

 excurved, smooth within, sinuate above 



L. "25 inch, of spire '16 inch, diam. -08 inch. 



West ladies. 

 (Jnfigured. I have not seen specimens of this species. 



C. DucLOSiANA, d'Orb. PI. 50, fig. 26. 



Shell oblong, subfusiform, smooth, striated below ; spire 

 elongated, conical, with apex acute, and composed of seven 

 flattened whorls; mouth narrow, flexuose, with a thickened, 

 internally dentate lip ; white or yellowish white, sometimes 

 prettily mnculated with red near the suture. Lengthy 4 mill. 



}Vest Indies. 



The figure represents a wider shell but with coloring not 

 unlike the " Gothic window summits " of the preceding species ; 

 the description also indicates a longer spire than shown by the 

 figure : so that the two descriptions may possibly be of varieties 

 of a single species. Should they prove to be identical Adams' 

 name would have priority. The above specific name is preoccu- 

 pied by Sowerb3\ 



C. AVARA, Duclos. ri. 50, figs. 27, 28. 



Shell pellucid white, with opaque white spots and an indistinct 

 narrow band on the periphery ; columella plicated. 



Length, 8 mill. 



Habitat unknoicn. 



Of course this is a very diflerent shell from G. avara^ Say, 

 which it is possibl}' intended to represent, and if a good species 

 it must receiA^e a new name. One of the figures, representing 

 the back of the shell, has numerous minute brown dots. 



C. TURBiDA, Duclos. PI. 50, fig. 29. 



Shell 3'ellowish, longitudinally strigated and reticulated with 

 chestnut; columella biplicate, outer lip dentate within. 



Length, 8 mill. 



Habitat unknown. 



Perhaps identical with the preceding species. 



C. uvANiA, Duclos. PI. 50, fig. 30. 



Smooth, with produced spire and apparently channeled suture; 

 outer lip greatly thickened and dentate within, inner lip plicate 

 below ; light yellowish brown, with an interrupted band of large 



