Illustrations of British Sea-Shells 



alive from any depth between four and one hundred fathoms. 

 The operculum is concentric. The remaining British species, 

 A . pes-carbonis, is closely allied to the above, but is smaller and 

 not so solid, and is very rare. 



Fig. 4. Cylichna cylindvacea (== Bullinella cylindracea). White 

 and glossy. Our largest native species. 



Figs. 5, 6. Cylichna obtusa(= Tornatina obtusa). Whitish or 

 pale fulvous. Does not exceed quarter of an inch in length. 



Fig. 7. Mangelia linearis (— Clathurella linearis). Whitish 

 with brown lines on the striae. 



Figs. 8, 9. Mangelia tnvricula (= Bela turricula). White, or 

 tinged rose-colour. The whorls in M. trevelyana, an allied 

 species, are rounder, and a distinct labial sinus is always 

 present. 



Fig. 10. Mangelia costata (= Mangilia costata). Whitish with 

 yellowish-brown spiral lines. 



Fig. 11. Natica monilifera (= Natica catena). Olivaceous 

 grey with flexuous markings of a chestnut colour. A white 

 rim usually margins the whorls. Operculum elliptical with 

 a small spire. 



Figs. 12, 13. N. nitida (= N. alderi). Highly polished; 

 ground colour variable, white, pale fawn or chestnut, with 

 five spiral coloured bands. N. montagni is a smaller species, 

 reddish flesh colour within and without, with a narrow 

 whitish band below the suture. 



Figs. 14, 15. Nassa incrassata. Mouth whitish with a dark 

 spot at the base of the canal. In N. pygmcea the mouth is 

 stained purplish-red. Operculum unguiculate. 



Figs. 16, 17. N. reticulata. Differs from N. incrassata in 

 the angular whorls, and in not having a dark spot at the 

 canal. 



Fig. 18. Scaphander lignarius. Glossy, pale orange, tawny, 

 with deeply incised striae. 



Fig. 19. Murex erinaceus (= Ocinebra erinacens). Brownish 

 white. M . corallina is smaller, rufous or brown, with rounded 

 unarmed ribs. 



