SHELLS. 393 



solidiuscula, spira minute iminersa, anfractibus sub lente 

 transversim minutissime et creberrime impresso-striatis ; pal- 

 lide fulva. 



The chief peculiarity of this species consists in the surface 

 being very minutely and closely impressly-striatecl across. 



B. nucleate (PI. XXXII. Fig. 2 a, b, c) . Bui. testa oblongo- 

 cylindracea, medio subcoarctata, Isevigata vel striis incrementi 

 arcuatim notata, apice angulato-immersa, sulco latiusculo ; in- 

 tense fulvo-castanea. 



Of a compressly oblong-cylindrical form, with the spire so 

 impressed as to show a broad internal groove, the shell being 

 coated throughout with a dark fulvous-chestnut cuticle. 



B. semen (PL XXXII. Fig. 4 a, b, c) . Bui. testa cylindra- 

 ceo-ovata, tumidiuscula, spira depresso-convexa, sutura im- 

 pressa, anfractibus Isevibus, convexiusculis, ultimo antice pau- 

 lulum descendente ; fulvescente-alba. 



Of a short cylindrical form, somewhat swollen, with a 

 depressly convex spire, having the suture faintly channelled. 



Hob. Port Refuge, in ten fathoms, mud. 



NATICA (Lamarck). 



N. septentrionalis, Beck, Moller, Index Moll. Green, p. 7. 

 N. Groenlandica, Beck, Moller, Ind. Moll. Grren. p. 7. 



MARGARITA (Leach). 



M. umbilicalis, Broderip and Sowerby, Zool. Journ. vol. iv. 

 Conch. Illus. Margarita, f. 5. 

 Hob. Northumberland Sound. 



LACUNA (Turton). 



L. vincta, Montagu (Turbo), vol. ii. p. 307 ; Supp. pi. 12. 

 f. 11. 



The specimens comprise varieties labiosa and quadrifasciata. 



Hab. Port Refuge. 



VOL. ii. :2 u 



