86 BUCCINUM. 



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



pidia. Fig. 210 to 213. 

 10. Lingula. Valves equal, gaping, with a peduncle. 

 Fig. 219. 



BRACHITOMA. Swainson. A genus composed of Pleurotoma 

 strombiformis and similar species, described as " sub-fusiform ; 

 resembling a small Strombus or Fusus ; spire and aperture of 

 equal length ; canal short ; outer lip slightly ascending, and 

 forming a short canal ; sinus very small and nearly semi- 

 circular; inner lip thickened above. B. Strombiformis, Sow. 

 Man. fig. 381." Europe, East and West Indies, China, &c. 



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

 branchiata, containing the following genera of symmetrical uni- 

 valves : — Fissurella, Emarginula, and Parmophorus. 



BRISMiEUS. Leach. Order. Pedunculated Cirripedes. Lam. 

 — Descr. Seven plates, three pairs lateral, one dorsal ; form 

 cylindrically conical ; pedicle not described. Hab. Holes in 

 corals. B. Rhophodius, fig. 38. — Obs. This minute shell most 

 nearly resembles Pollicipes Mitellus, fig. 37*> but the difference 

 may be seen at once by comparing the figures. 



BRONTES. Montf. This generic name is given to such species 

 of Murex as have a very long, closed canal ; with a short spire> 

 circular aperture, and are destitute of spires and ramifications. 

 Brontes (Murex) Haustellum, fig. 396. 



BUCARDIA. Schum. Isocardia, Auct. 



BUCCINUM. Linn. Fam. Purpurifera, Lam. Entomostomata, 

 Bl. — Descr. Subovate or oblong, covered with an epidermis; 

 spire turrited, consisting of few whorls ; aperture wide, subovate, 

 terminating anteriorly in a very short canal, reflected over the 

 back ; outer lip simple, slightly reflected ; inner lip spread over 

 a portion of the body whorl, terminating in a thick, smooth 

 columella ; operculum horny. Hab. British Seas, Northern 

 Ocean, and Coast of Africa. Most of the fossil species occur in 

 Crag, some in upper marine formation and London clay.— Obs. 

 There are considerable difficulties in keeping this genus distinct 



