CEPHALOPODA. 



35 



Beloteuthts. Munstcr. — Shell, a horny pen, which 

 is lanceolate, the shaft broad, pointed at each end, and 

 having small furrows on the under side. — 1 species, fossil. 

 B. subcostata. 



Family 3. — BELEMNITA CEA. 



This division of Cephalopoda is only known in the 

 fossil state. The shell consists of a pen, having a many 

 chambered cone, straight, and with a siphuncle lying close 

 to the ventral side ; the outside is usually marked by con- 

 centric lines of growth. — All fossil. 



Beloptera. Deshayes. — Shell calcareous, conical, 

 straight, or slightly curved, chambered, with a siphuncle 

 on the edge ; external sheath elongate, rather cylindrical 

 in front, and sometimes winged on the sides, ending in a 

 blunt beak at the hinder end. — 3 species, fossil. (Gray.) 



Conoteuthis. U Orb. — Shell cone-shaped, broad, 

 rapidly enlarging, thin, horny, and smooth, 

 marked with very slight, rather oblique, con- 

 centric lines of growth, not covered with any 

 calcareous coat ; septa transverse, smooth. — 

 1 species, fossil. (Gray.) 



Belemnoteuthis. Pearce. (Belemnites 

 Owen; Belemnosepia Dcsh.) — Shell internal, 

 conical, thin, cylindrical, apex conical, cham- 

 bered ; septa concave ; siphuncle near the edge. 

 " Animal provided with arms and tentacula of 

 nearly equal length, furnished with a double 

 alternating series of horny hooks, from 20 to 

 40 pairs on each arm ; mantle free all round ; 

 fins large." (Woodward.) — 1 species, fossil. (Gray.) 



At Chippenham specimens have been found preserved, 



D 2 



