124 CLASS III. GASTEROPODA. ORDER VII. PECTINIBRANCHIATA. 
thickened towards the upper part, and more or less truncated at the lower ; 
the aperture is generally oblong, acute and sometimes canaliculated above, 
and deeply sinuated below ; the lip isa little reflected, and the operculum 
is horny, spiral and small. 
Examples. 
Pl. CXCV. Fig. 1. 
Metanopsis atrA, De Férussac, Monographie des Mélanopsides, Mém. 
de la Société d’Hist. Nat. de Paris, p. 161. Quoy and Gaimard, 
Voy. de l’Astrolabe, pl. 56. 
Strombus ater, Linnzus. 
Nerita atra, Miller. 
Strombus atro-purpureus, Schroeter. 
Strombus dealbatus, Gmelin. 
Buccinum acicula, Gmelin. 
Cerithium fluviatile, De Férussac. 
Pl. CXCV. Fig. 2. 
Me anopsis BucciNoIpES, De Férussac, Monog. des Mélanopsides, Mém. 
de la Soc. d’Hist. Nat. de Paris, vol. i. p. 148. pl. 7. f. 1 to 11, and 
pl. 8. f. 1 to 4. 
Buccinum prerosum, Linneus. 
Melania buccinoidea, Olivier. 
Melanopsis levigata, Lamarck. 
Pl. CXCV. Fig. 3. 
Mexanopsis costata, De Férussac, Monog. des Mélanopsides, Mém. de 
la Soc. d’Hist. Nat. de Paris, vol. i. p. 156. pl. 7. f.14 and 15. En- 
cyclopédie Méthodique, pl. 458. f. 7. 
Melania costata, Olivier. 
Pl. CXCV.. “Big. 4. 
MELANopsis AcicuLaris, De Férussac, Monog. des Mélanopsides, Mém. 
de la Soc. d’Hist. Nat. de Paris, vol. i. p. 160. 
Melanopsis Audebardu, Prévost. 
