180 MITROPSIS, CONIDEA. 



arrangement of spots and streaks which cover the entire surface. 

 The latter state is represented by C. m^rwZa,Dunker (fig. 52), an 

 intermediate one by C. costulata, C. B. Ad. Other synonyms 

 are C. Antillarum, Reeve (fig. 53), C. scutulata, Reeve (fig. 54), 

 C. sparsa, Rve. (fig. 55). 



C. VIRGINEA, Gould. 



Shell minute, rhomboidally fusiform, with fourteen longitudinal 

 plications and a few anterior revolving striae ; whorls six, subtab- 

 ulate, with an impressed subsutural line ; aperture narrow, the 



lip without teeth. L. 4, diam. 1 mill. 



China Seas (Stimpson). 



Unfigured. The types were probably destroyed in the great 

 Chicago fire. 



Section VIII. Mitropsis, Pease. 



The only character in the description by which this group is 

 distinguished from Seminella is the plicate columella, yet these 

 plications appear in the figure of the only species to be con- 

 nected with the external basal grooving ; its distinctness from 

 Seminella must be considered doubtful. Pease described it as a 

 genus of Mitridse. 



C. PAUMOTENSIS, Tryon. PL 58, fig. 56. 



Shell fusiform, much attenuated at both ends, white, shining, 

 spire small, slender ; whorls longitudinally ribbed ; ribs rather 

 remote, rounded, descending from the sutures, last whorl gibbous 

 on its right side ; transversely finely striate ; sutures widely and 

 deeply grooved ; base grooved transversely ; canal recurved, 



columella four-plaited. Length, 1 mill. 



Paumotus. 



" The callosity bordering the inner lip gives it a Columbelloid 

 appearance." The above is Pease's description of Mitropsis 

 fusiformis : the specific name being preoccupied in Columbella, 

 I am forced to change it. 



Section IX. Conidea, Swainson. 



Shell oval, mitriform, smooth, with moderately elevated, 

 convex spire ; inner lip reflected in front ; outer lip incurved 

 and thickened in the jniddle and crenulate within. 



