829 



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

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



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

 tenuiter striata, virente, fusco-maculata ; spira minima, ad latus 

 dccumbente. 



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. 14, 15, 16), Quay et Gaimard 

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



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

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

 terminali ; apertura ovali-integra. 



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

 margin longitudinally striated, within brilliant violet ; spire very 

 small, 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. Adams, Pro. 

 Zool. Soc. Feb. 1850. 



G. testa haliotoidea, 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 stria? 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. Preston.. (Mus. Cuming.) 



