PHASIANELLA. MOLLUSCA. 43 



dinal streaks. 2 inches long. Inhabits Coast of Guinea. 

 D'Argenv. pi. 11, fig. C. 



Fossil species of this genus are found in Britain in the London clay, and in lime- 

 stone of the coal formation. 



Gen. 38. PHASIANELLA, Lin. 



Shell oval or conical, solid ; aperture entire, oval, longer than 

 broad, with the margin disunited above ; lip edged, not reflect- 

 ed ; columella smooth, attenuated at the base ; operculum 

 calcareous or horny. 



The shells of this genus are smooth, shining, without an epidermis, and ornament- 

 ed with agreeable colours. They are all marine, and were confounded by the ear- 

 lier writers among the Helices. The animal is a Trachelipode, with two long conical 

 tentacula, and the eyes supported on pedicles at their base. The branchial cavity 

 contains two pectiniform branchisa. 



P. bulimoides, Lam. Shell oblong-conic, thin, smooth, pale-yellow, 

 with transverse variegated bands and veins ; aperture oval and 

 entire ; apex acute. 2^ inches long. Inhabits seas of New Hol- 

 land. Chem. ix. pi. 120, fig. 1033, 1034. 



P. rubens, Lam. Shell ovato-conic, smooth, shining, reddish, with 

 small white scattered spots, and girdled with fuscous distant lines. 

 1 inch long. Inhabits seas of New Holland Lam. vii. 53. 



Gen. 39. PLANAXIS, Lam. tfuccinum, Brug. 

 Shell ovato-conic, solid ; aperture ovate, subelongated ; colu- 

 mella flattened and truncated at the base, separated from the 

 lip by a narrow sinus ; lip furrowed or sulcated interiorly, with 

 a callosity running under the upper part. 



The shells of this genus are marine, furrowed transversely exteriorly, and of 

 small size. They resemble the Phasianellae, but have the pillar truncated at the 

 base. The callosity on the margin of the lip approaches them to the Buccina. 



P. sulcata, Lam. Shell ovato-conic, imperforate, transversely fur- 

 rowed, white, spotted with black ; spots subquadrate ; margin of 

 the lip crenulated and striated within. Upwards of an inch long. 

 Inhabits American seas. Lister, pi. 980, fig. 39. 



Gen. 40. TUIIBO, Lam. Lin. 



Shell conoid or subturriculated ; aperture entire, rounded, with 

 the margin above disunited ; columella arched, flattened, the 

 base not truncated ; an operculum. 



The shells of this genus, very numerous in species, are marine, solid, often re- 

 markable for their thickness, sometimes of a pearly consistence, and diversified with 

 agreeable colours. The animal has a foot or ventral disc shorter than the shell and 

 obtuse at both ends. The tentacula are pointed, and support the eyes on their exte 

 rior base. 



T. marmoraius, Lin. Shell subovate, ventricose, smooth, imper- 

 forate, with three transverse nodulous belts, and the outer lip 

 dilated ; colour dull green, marbled with brown and white ;, 

 mouth silvery. 4 inches long. Inhabits Indian Ocean. Lister, 

 pi. 587, fig. 46. 



T. argyrostomus, Lin. Shell subovate, ventricose, with transverse 



