too 



OUR COMMON BRITISH FOSSILS, 



nites" should be regarded as belonging to that group 

 of animals which, rightly or wrongly, has for years 

 occupied the leading position of the Invertebrates. 

 Nautiluses and "cuttle-fishes" still figure at the top 



Fig, 297. — Lituites articulatus. 



Fig. '2()6.—Orthoceras, upper 

 part shows chamber perfor- 

 ated by siphuncle. 



-Cyrtoceras Murchisoni 

 (Silurian). 



of this division, and many students accept that posi- 

 tion as indicating their higher zoological rank. Many 

 philosophical naturalists doubt this, but meantime we 

 must accept it, for classification purposes at least. 



