102 



HITCHCOCK'S ANATOMY 



221. Head. — The bones of the Head in this class of ani- 

 mals are numerous and exceedingly complicated, being in 

 fact a difficult portion of study in comparative osteology. It 

 is, however, a subject of great interest to a thorough scholar 

 of this branch of anatomy ; but as so little of it can be gen- 

 eralized, it must be omitted h.re altogether. 



222. Great Variety of Teeth. — The Teeth present every 

 possible variety in position and size, and, as Sir Richard 

 Owen says, "they average in number from zero to count- 



Fig. 114. 



Hea<t of the Pike. c. Cranium, n. Nasal Fossze. im. Intermaxillary Bone. 

 Upper Jaw. p., op. y io. Bones peculiar to the head of fishes. 



less quantities." Some teeth, in shape and lob&ckm re- 

 semble the pavement of the street, others are of a delicate 

 hook-shape, and others still are fine as hairs, and are located 



Fig. 115. 



Head of a Shark. 



221. What is remarkable with respect to the bones of the Head in this class? 222. What 

 is said about the variety of Fishes' Teeth ? How numerous are they found at times? 



