829 



3. Gena planulata (pi. clxxiii. f. 1, 2, 3), Lamarck (Sto- 

 matella), Hist. ed. Desh. vol. iv. p. 17. 



G. testa haliotoidea, oblonga, planulata, dorso convexo-depressa, 

 t^nuiter striata, virente, fasco-maculata ; spira minima, ad latus 

 decumbente. 



Shell haliotoid, oblong, flattened, convexly depressed on the 

 back, finely striated, greenish, spotted with fuscous ; spire small, 

 laterally inclined. 



Island of Camaguin ; under smooth stones, low water. (Mus. 

 Cuming.) 



4. Gena nigra (pi. clxxiii. f. 11, 15, 16), Qiuoy et Gaimard 

 (Stomatella), Voy. de I'Astrol. tab. 17. f. 154, 155. 



G. testa elongato-ovali, convexa, Isevi, nigra, margine dextro 

 longitrorsum striata, intus violaceo folgente ; spira minima, sub- 

 terminah ; apertura ovali-integra. 



Shell elongately oval, convex, smooth, black, with the right 

 margin longitudinally striated, within brilliant violet ; spire very 

 smaU, subterminal ; aperture ovate, entire. 



Tonga Tabou, Sandwich Islands. (Mus. Cuming.) 



5. Gena plumbea (pi. clxxiii. f. 13), A. Adams, Pro. Zool. 

 Soc. Feb. 1850. 



G. testa haliotoidea, ovato-oblonga, dorso ad latus dextrum gib- 

 bosa, ad sinistrum planulata, plumbea, decussatim tota striata; spira 

 prominula; anfractibus rotundatis, ultimo ad suturam gibboso; 

 apertura postice subcanaliculata ; labro, in medio, flexuoso. 



_ Decussately striated, lead-coloured, the right side of the back 

 gibbous, the left flattened ; outer lip flexuous in the middle. 



Java. (Mus. Cuming.) 



6. Gena striatula (pi. clxxiii. f. 9, 10), A. Adapts, Pro. 

 Zool. Soc. Peb. 1850. 



G. testa hahotoidea, ovato-oblonga, dorso planiuscula, tota stri- 

 ata, striis profundis, subdistantibus, rubra, flaveolo aurantiaco 

 fuscoque varie picta ; spira prominula, nonnunquam subdistorta ; 

 labro valde flexuoso. 



Flat on the back, entirely striated, the strise deep and rather 

 wide apart; red, varied with orange, yellow, and brown; spire 

 prominent, sometimes rather contorted ; outer lip strongly flexu- 

 ous. 



Calapan, island of Mindoro ; on small stones, nine fathoms. 

 Australia. Lieut. Tredon. (Mus. Cuming.) 



