TUIIBONILLA. 327 



T. COSTIFERA, E. A. Smith. PL 75, fig. 92. 



Light fulvous ; whorls 8, rather flattened, longitudinally cos- 

 tate, the interstices finely spirally striate, with a diaphanous 

 band below the suture; columella uniplicate. Length, 5'5 mill. 



Whydah, W. Africa. 



T. SPECTABILIS, Monts. (unfigured). Mediterranean. 



T. CLATHRATA, Jeffreys. PI. 74, figs. 71, 72. 



Shell solid, opaque, shining; whorls 7, convex, with about 20 

 strong flexuous longitudinal ribs, extending to the base of the 

 body-whorl, with equal interstices, which are crossed by two 

 strong spiral interrupted riblets (three on the last whorl) ; color 

 whitish or pale reddish brown ; columella without tooth. 



Length, 4 mill. Great Britain. 



T. SIGMOIDEA, Monts. PI. 75, figs. 93, 94. 



Rather thin, semitransparent, glossy; whorls 8, flattened, 

 with about 25 very flexuous oblique ribs, the wider interstices 

 spirally striate. Length, 3'75 mill. Algiers, Palermo. 



T. FLEXUOSA, Jeffreys. PL 75, fig. 95. 



Rather thin, semitransparent, glossy; whorls 5, flattened, 

 with 15-20 sharp, flexuous longitudinal ribs, abrupt or sub- 

 nodose at the suture, almost disappearing at the periphery 

 where they are crossed by a few spiral striae. Length, 2*5 mill. 



Mediterranean Sea. 



Section PYRGOSTYLUS, Monts., 1884. 

 T. STRIATULA, Linn. PL 74, fig. 75. 



Shell thin, pale brown, with three darker bands, closely longi- 

 tudinally ribbed, with much narrower interspaces, both crossed 

 by distant spiral striae, of which there are four on the spire- 

 whorls ; whorls (normal) 9, rounded, with well impressed suture. 



Length, 9 mill. Mediterranean. 



The synonyms include T. striolata, Weink. ; T. varicosa, 

 Forbes ; T. potamoides, Cantraine ; T. pallida^ Phil. 



T. CAiNDiDA, T. RUGOSA, Folin. We*>t Africa. 



The work in which these are described and figured is not 

 accessible. 



