CLATHURELLA. 271 



having a single whorl, globular, and partially umbilicate, with a 



roundish mouth and an incomplete canal like that of lanthina. 



The fry, when in the capsule, are very restless, and gyrate fieely 



by means of their ciliated front lobes. JEFFREYS, Brit. Conch., 



iv, 369. 



Var. MAJOR, Requien. Nearly double the usual size. 



Yar. BREVIS, Requien. Shell short. 



Yar. ^EQUALIS, Jeffreys. Broader, with more rounded whorls 

 and closer, less prominent sculpture than the type ; apex 

 yellowish white, colored lines regularly distributed and of 

 a paler hue, or altogether wanting. Includes vars. inter- 

 media and pallida of Forbes and Hanley. 



Yar. VIOLACEA, Monts. Dark violet. 



Yar. RUBROLINEATA, Monts. Revolving lines red instead of 

 chestnut. 



C. CONCINNA, Scacchi. PI. 34, fig. 85. 



Longitudinal ribs rounded, not very prominent, distant, 

 revolving lines fine and numerous, canal very short, aperture 

 wide, lip rather thick, smooth within, with shallow sinus ; grayish, 

 with interrupted bands and lines of chestnut. Length, 13 mill. 



Mediterranean Sea. 



Some authors consider this a var. major of the preceding 

 species, but it appears to be sufficiently distinct in other respects 

 besides that of size. 



C. PLIOATA, C. B. Ad. PI. 30, fig. 98 ; PL 18, fig. 92. 



Longitudinal ribs 11-12, prominent, crossed by about the same 

 number of strong, thread-like ridges, the intersections sometimes 

 produced into nodules ; reddish chocolate, interior dark chocolate. 



Length, 6-8 mill. 



New England to Tampa Bay, West Coast of Florida. 



The shell is only whitish in dead specimens. Prof. Adams 

 changed the name to plicosa, because Lamarck described a fossil 

 Pleurotoma plicata ; of course, in Clathurella the original name 

 can still be used. The synonyms include G. brunnea, Perkins, 

 and C. Jewetti, Stearns (PI. 18, fig. 92), the latter found on 

 oysters at Tampa Bay, Fla. 



