AMMONITES, BELEMNITES, &c. 



605 



tilus Pompilius, to which in their structure they were evidently nearly 

 related. The countless petrified remains known by the names of Hamites, 

 Lituites, Orthoceratites, Cirthoeeratites, and other allied forms are still 

 representatives of the existing Spirula (fig. 304), which, although its 

 structure even at the present day is but imperfectly understood, is mani- 

 festly a Cuttle-fish provided with a camerated shell constructed much 

 after the same plan as that of the Nautilus ; and even the Belemnites, 

 so long a puzzle and a mystery to geologists, when restored by the 

 labours of Professor Owen, as represented in fig. 305, unmistakeably 

 confesses its relationship to the Cuttle-fishes we have been describing. 



Fig. 305. 



Fig. 304. 



1 . Animal of Spirula, 

 exhibiting the shell in 

 situ. 2. Transverse 

 section, and, 3, lateral 

 view of the shell re- 

 moved from the body. 



Belemnite restored : a, ce- 

 phalic tentacles ; b, siphon ; 

 c, ink-bag ; d, e, section of 

 shell. The outline exhibits 

 the fin-like expansions of the 

 integument. 



(1613.) Leaving the Cephalopod Mollusca, we must bid adieu to the 

 fourth grand division of the animal kingdom, and proceed in the next 

 chapter to introduce the reader to beings organized according to a dif- 

 ferent type, embracing the most highly gifted and intelligent occupants 

 of the planet to which we belong. 



