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. Ilab. Holes in 

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

 nearly resembles Pollicipes Mitellus, fig. 3/*, 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 



