126 



CONCHOLOGY. 



6. Genus Phasianella. PI. XL 



Animal. Spiral ; foot oval ; upon each side an appendage 

 ornamented with filaments ; head edged anteriorly with a kind of 

 veil formed by a double, bifid, fringed lip ; two, long, conical ten. 

 tacula ; eyes borne upon short peduncles and situated at the ex- 

 ternal part of their base ; mouth between two vertical subcornate 

 lips. 



Shell. Marine ; many of them very rare and valuable ; their 

 beauty of colouring disposed so as to resemble the plumage of a 

 pheasant. Oval, rather thick, smooth and glossy, spire pointed; 

 columella uniting itself with the left edge, forming interiorly a 

 longitudinal callosity ; aperture oval, larger before, with edges 

 disunited ; operculum calcareous, oval, oblong, subspiral, the 

 summit at one extrem.ity. Inhabits the British coast. Twelve 

 species. 



Phasianella variegata. Phasianella sulcata. 



P. rubens. P. angulifera. 



P. bulimoides. P. lineolata. 



P. elegans. P. perdix. 



P. lineata. P. Mauritania. 



p. nebulosa. P. Peruviana. 



7. Genus Turritella. PL XI. 



Animal. Spiral ; foot fringed anteriorly by a transversely 

 .wrinkled band ; tentacula long, very fine towards their extremity, 

 somewhat thick at their base, and having the eyes upon an infla- 

 tion ; the head skirted with a veil or fringe garnished with fila- 

 ments. 



Shell. Turreted, not nacred, rather thin, striated in the direc- 

 tion of the decurrence of the spire ; very pointed, and with 

 numerous whorls ; aperture rounded ; the edges posteriorly, the 

 right exceedingly thin, and slightly sinous towards the middle ; 

 operculum horny. Inhabits the Indian and American Oceans. 

 Twenty-one living species. Thirty-seven fossil. 



Turritella duplicata. Turritella terebra. 



T. imbricata. T. replicata. 



