BEZOAEDICA. 83 



BEAK. The Apices, or points of the valves of a bivalve shell, 

 generally termed TJmbones, in descriptions. Also any part 

 which is rostrated or drawn out like a beak. 



BEAKED. See Beak and Eosteated. 



BEAE-'S PA"W-CLAM. The common name for Hippopus macu- 

 latus, a representation of which is given in the plates, fig. 156. 



BELEMNITES. Lamarck. 1801. (BeXein'or, helemnon, a dart, or 

 arrow.) Fam. Orthocerata, Bl. and Lam. — Bescr. Straight, 

 conical, consisting of two parts ; the external portion forming a 

 thick solid sheath, with a cavity at the base to admit the inter- 

 nal portion or nucleus, which is mathematically conical, and is 

 divided into chambers by smooth simple septa perforated by a 

 lateral siphon. — Obs. These singular fossils, which are found in 

 most secondary beds, have long attracted the attention of philo- 

 sophers as well as of the ignorant, from whom they have received 

 the various appellations of Thunder-Stones, Petrified Arrows, 

 Petrified Eingers, Devil's Eingers, Spectre Candles, &q. The 

 above description is framed to include the genera Hibolithes, 

 Porodragus, Cetocis, Acamas, and Paclites of De Montfort, and 

 Actinocamax, Stokes. PI. xxii. fig. 466 to 468. 



BELLEEOPHOIST. Montf. 1810. (or Bellerophus).- Z>eser. 

 Convolute, symmetrical, umbilicated with a double dorsal ridge ; 

 aperture wide, semilunar. — Obs. The fossils composing this 

 genus resemble Nautilus in general appearance, but not being 

 chambered shells they approach very near to Argonauta, from 

 which they differ only in the thickness of their shell and in 

 roundness of their external form. This genus is erroneously 

 placed by De Montfort among chambered shells, and by De 

 Blainville next to Bulla. It belongs to the Monothalamous 

 Cephalopoda of Lamarck. This fossil is found principally in the 

 Carboniferous Limestone. B, tenuifasciata. PI. xxiii. fig. 

 486, 487. 



BELOPTEEA. The bony support of a species of Cuttlefish, partly 

 resembling Sepia. 



BEZOAEDICA. Schum. Part of the genus Cassidea, Swainsou. 

 Cassis glauca, &c. 



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