L UN ELLA. 393 



Genus SARMATICUS, Gra}'. 



Operculum without spiral ridges, covered externally 

 with numerous, separate, flat-topped tubercles. 



Shell turbinate, nodulous, axis imperforate ; sjDire de- 

 pressed ; aperture expanded, wider than long ; inner 

 lip flattened, excavated, with an elevated, curved line ; 

 outer lip with an intra-raarginal line of black animal 

 matter. 



Syn. Cidaris, Swains., not Klein or Bolt. 



Ex. S. classicarius. Gray, pi. 43, fig. 3. Operculum, 

 S. classicarius, fig. 3, a, 3, h. 



Sarmaticus is peculiar from having a layer of blackish 

 animal matter between the outer opaque, and the inner 

 pearly, coat of the shell, which forms a dark zone be- 

 tween the edges of the two coats, just within the aper- 

 tui'e. The name of Swainson {Cidaris) is ah'eady in 

 use for a genus of Echinodermata. 



Species of Sarmaticus. 



classicarius, Grarj. Natalensis, Krauss. 



helicinus, Born. 



Genus lunella, Bolten. 



Opei'culum with an indistinct, sub-central rib, sur- 

 rounded by a broad, flat margin. 



Shell turbinate, solid, axis deeply and widely perfo- 

 rated ; spire depressed, whorls flat, smooth ; aperture 

 circular; inner lip flattened and produced anteriorly. 



Syn. Marmorostoma, Swains. 

 VOL. I. 3 E 



