'254 LEPTOTHYRA. 



lated by the plications or not. The base is usually more finely 

 sculptured and sometimes quite smooth except for lines of growth." 



(Ball) 



Aperture very oblique, small, its upper margin produced forward 

 and slightly deflected ; columella with a stout transverse tubercle 

 about midway its length, and a minute denticle at the point of its 

 junction with the basal lip; parietal wall with a bright white callus. 



Alt. 7, diam. 61 mill. 



Gulf of Mexico (off Havana, etc.'} 1 25-1 002 fms.; off Cape Hatteras, 

 142 fms. 



Operculum inside pale yellow, multispiral ; outside calcareous, 

 polished, white, nearly smooth, showing one whorl with a concen- 

 tric convexity, much elevated at its termination, central area con- 

 cave. 



" This shell is so variable that I should be disposed to think 

 Watson's Turbo (Collonia) indutus a mere abnormally smooth spec- 

 imen * * * it is very probable that they will turn out to be 

 varieties of the same species." (Dall,~) 



L. FILIFER Desh., 1863. PL 58, figs. 57, 58. 



Shell subglobulose, solid, turbinate, perforate, rosy rubescent, 

 variegated with castaneous and white ; spire short, obtuse ; whorls 

 5, spirally finely lirate, the last large; base subdepressed ; aperture 

 lunate-circular, oblique, pearly within ; columella callous below. 



Alt. 7, diam. 7 mill. 



Mauritius. 



L. CICEB (Menke) Phil., 1844. PL 54, fig. 62. 



Shell small, globose-conic, solid, perforate, whitish, tessellated 

 with purple-brown or reddish, the markings usually arranged in 

 regular longitudinal series ; spire conic ; whorls 42-5, convex, with 

 moderate sutures, somewhat flattened and sloping around the upper 

 part, spirally coarsely and rather obscurely lirate ; aperture oblique, 

 slightly deflected above ; columella obsoletely dilated toward the 

 base, umbilicus very narrow 7 ; base finely lirate. 



Alt. 6-7, diam. 6-7 mill. 



Cape of Good Hope. 



T. sanguineus Reeve = T. roseus Phil, may be synonymous with 

 this species. At any rate no one can tell positively from Reeve's 

 wretched description and figure what form he had before him. 



