170 CLASS III. GASTEROPODA. ORDER VII. PECTINIBRANCHIATA. 
Examples. 
Pl. CCXXII. Fig. 1. 
Litrorina vuLGARIS, Sowerby, Genera of Shells, No. 37. 
Turbo littoreus, Linneeus. Lamarck. 
Littorina littorea, De Férussac. 
Pl. CCXXII. Fig. 2 and 3. 
Lirrorina PuLCcHRA, Sowerby, Genera of Shells, No. 37. 
Turbo pulcher, Swainson. 
Pl. CCXXII. Fig. 4. 
Lirrorrna varia, Sowerby, Genera of Shells, No. 37. 
Pl. CCXXII. Fig. 5. 
LirroriNa FILosA, Sowerby, Genera of Shells, No. 37. 
Pl. CCXXII. Fig. 6. 
Lirrorina opesa, Sowerby, Genera of Shells, No. 37. 
PHASIANELLA, Lamarck. 
Testa ovato-oblonga, levis, polita, spira regulari, elata; apertura ovali, 
posticé plus minusve angulata ; columella levi, depressa, versis mar- 
ginem basalem attenuata ; labro simplici, acuto, nunquam reflexo, 
parte inferiori interdum incrassato. Operculum calcareum, extis 
leve, convexum, ints inferné spirale. 
The genus Phasianella was introduced by Lamarck ; and after removing 
some of that author’s species of it to Littorina, it is perhaps as well defined 
as any of the series. The Phasianellze may be recognized either by their 
shell, or their operculum, both having a peculiarity of their own: the 
shell, which is as highly polished as porcelain, is always most delicately 
