SCUTELLINA. 461 



Shell orbicular or ovate, depressly-conical or cap- 

 shaped, surface cancellated, or with radiating ribs or 

 striae; apex sub-central, or sub-marginal and posterior; 

 aperture wide, circular, or ovate, margin often bordered 

 internally, outer edge more or less crenulated ; interior 

 with a cresentic, muscular impression, interrupted in the 

 region of the head. 



Syn. Scutella, Brod., not Lam. 



Ex. S. ferruginea, A. Adams, pi. 52, fig. 6, 6, a. Shell, 

 S. crenulata, Brodevip, fig. Q, h. S. (Tothia) fulva, 

 Afiiller, 6, c. 



This genus is composed of a series of beautiful and de- 

 licate shells from the Red Sea, Panama, the Philippines, 

 and the north of Europe ; they are usually of a white 

 colour, and very similar in form and sculpture to Helcion. 

 The lingual riband in the sub-genus lothia, which scarcely 

 differs, even in the shell, from Scutellina, is composed of 

 a single series of squares, on each of which a single tri- 

 lobed tooth is borne, flanked on each side by two distinct 

 accessorials. (Forbes.) 



Species of Scutellina. 



Arabica, Riipp. elongata, A. Adams. 



asperulata, A. Adams. ferruginea, A. Adams. 



cinuamomea, Gould. Galathea, Lam. 



costata, A. Adams. granulosa, A. Adams. 



crenulata, Brod. laevicostalis, A. Adams. 



Sub-gen. iothia, Forbes (Pilidium, Forbes and Hanley. Patel- 

 loida, Cantr., not Quoy and Gaim.). 



Shell with the apex sub-central; aperture with the margin 

 entire. 



fulva, Midi. 



