360 RISSOIA. 



color, unicolored or bifasciate ; lip thick, labiate and sulcate within, 

 white-varicose externally. Length, 6 mill. 



Mediterranean Sea. 



The synonyms are It. calathiscus, Mtg., R. Boryanus, Chiaje, R. 

 cancellata, Desm., R. Europea, Risso, It. Fremenvillei and R. mamil- 

 lata, Risso, R. granulata, Phil., and vars. paupercula, and depau- 

 perata, Monts. 

 R. MONTAGUI, Payr. PI. 65, fig. 15. 



Imperforate, thick, spirally lirate, longitudinally strongly ribbed, 

 whitish, yellowish or chestnut color, plain or with one or two bands; 

 whorls 5, suture distinct, subchanneled ; aperture white-lipped and 

 sulcate within, with white varix externally. Length, 5 mill. 



Mediterranean Sea. 



The most striking difference between this and the preceding 

 species is in the prominence of the longitudinal over the spiral 

 sculpture. The synonyms are R. Sardoa, Risso, R. Nicolosiana, 

 Arad. and Benoit, R. buccinoides, Desh. (in part), and R. Schwar- 

 ziana, Brus. 

 R. CANARIENSIS, d'Orb. PI. 65, fig. 32. 



Imperforate, solid, white, covered with rounded nodules by the 

 intersection of longitudinal and spiral ribs ; whorls 5, slightly con- 

 vex, with rather deep suture, lip thickened and margined. 



Length, T75 mill. 



Madeira, Canary Is., Algiers, Palermo. 



R. CALATHUS, Forbes and Hanley. PL 65, fig. 30. 



Like the last species, but more conical, more rudely sculptured, 

 the longitudinal sculpture more prominent. Length, 4 mill. 



Europe. 

 R. LINEATA, Risso. PL 64, figs. 1, 3 ; PL 65, figs. 13, 29. 



With strong ribs, becoming obsolete on the base, and numerous 

 spiral lirse, yellowish or fulvous, the lirse forming lines of deeper 

 color ; whorls 6, convex, with deep suture ; lip thickened externally, 

 plicate within. Length, 4 mill. 



Mediterranean Sea. 



R. rugulosa, Arad., R. coronata, Brasilia, R. lignea (Thorpe?) 

 Reeve (fig 13), var. costulosa, Risso, and R. Peloritana, Arad. et 

 Benoit. (fig. 3), are synonyms. 

 Var. ASPERA, Phil. Fig. 29. 



Decussations deeper, giving the nodules a rough appearance. 



It is R. variegata, Danilo and Sandri, and R. costulosa, Schwartz. 



