BUCARDIA. 



87 



2. Atbypa. Without foramen or space between the valves. 



Fig. 203. 

 fS. Peodijcta. The same, valves produced, overwrapping : 



including Leptsena. Kg. 206, 206*. 



4. Teeebeatula. Hinge of the upper valve produced be- 



yond that of the other, vrith a pit or foramen ; including 

 Delthyris, Orthis, Trigonosemus, Magas, Sfrophomena. 

 Fig. 202, 205, 207, 208, 209. 



5. Spieieee. The same, with deep triangular area; spiral 



folds in the interior ; including Trigonotreta and Cyrtia. 

 Fig. 204, 214, 215. 



6. Thecidium. Large valve attached ; curved ridges in the 



inner surface ; two jutting points or teeth on the hinge. 

 Fig. 216. 



7. Ceakia. Attached by the surface of the valve ; muscular 



impressions four, forming a face. Fig. 197, a, 6. 



8. PrcisroDONTA. Irregular; hinge with raised pointed teeth. 



Fig. 217, 218. 



9. Pentamerus. Valves divided by septa ; including Gy- 



pidia. Fig. 210 to 213. 

 10. LiifGTJLA. Yalves equal, gaping, with a peduncle. Fig. 219. 



BRACHISTOMA. Swainson. 1840. Clavatula, Lamarck. 1801. 



BRANCHIFEEA. Bl. The second family of the order Cervico- 

 branchiata, containing the following genera of symmetrical 

 univalves : — Fissurella, Emarginula, and Parmophorus. 



BB-ISlSr^US. Leach. Order. Pedunculated Cirripedes. Lam. 

 B. Ehodiopus. Part of the genus Lithotota. PI. ii. fig. 37. 



BEOCCHIA. Brown. Patella sinuata ? 



BEODEEIPIA. Gray, 1847. Part of the genus Scutella, Bro- 

 derip-type, Scutella rosea, PL sxiv. figs. 508, 509. 



BEOJSTTES. Montf. 1810. This generic name is given to such 

 species of Mueex as have a very long, closed canal ; with a short 

 spire, circular aperture, and are destitute of spires and ramifica- 

 tions. Brontes (Murex) HausteUum, PI. xvii. fig. 896. 



BETOPA. Gray, 1840. Clavagella aperta, &c. 



BUCAEDIA. Schum. Isocaedia, Auct. 



