248 



HISTORICAL PALAEONTOLOGY. 



the soft parts of the animal. Thus we know that the Belem- 

 nites were in many respects comparable with the existing 



Fig. 173. A, Restoration of the animal of the Belemnite ; B, Diagram showing the 

 complete skeleton of a Belemnite, consisting of the chambered phragmacone (a;, the 

 guard (b), and the horny pen (c); C, Specimen of Belemnites canaliculatua, from the 

 Inferior Oolite. (After Phillips.) 



Calamaries or Squids, the body being furnished with lateral 

 fins, and the head carrying a circle of ten " arms, " two of 



! 



v 



Fig. Vll.Tetragonolepis (restored), and scales of the same. Lias. 



which were longer than the others (fig. 173, A). The suckers 

 on the arms were provided, further, with horny hooks; there 



