EXTINCT ANIMALS 



or limbs which represent the anterior or breast 

 fins of a common fish. Hugh Miller puzzled this 

 out with great skill and constructed a card- 

 board model of the fish which we have still pre- 

 served in the Natural History Museum. It will, 

 I think, be interesting to those who have read 

 the writings of Hugh Miller {The Testimony of 

 the Rocks, My Schools and Schoolmasters, and 

 other books) to see a photograph of the model 

 of Pterichthys which he made wdth his OAvn 

 hands (Fig. 184). 



In the same rocks with Pterichthys occurs 

 another very curious fish, the Coccosteus. This 

 and Pterichthys w^ere of small size only, about a 

 foot long, but in Ohio in the United States the 

 lower jaws and skulls of huge fishes allied to 

 Coccosteus have been found, which must have 

 been ten or twelve feet in length. The lower 

 jaw of one of these (called Dinichthys), together 

 with a restored outline of Coccosteus is shown 

 in Fig. 185. 



Very strange and curious fishes (only a few 

 inches long) are found in still older strata — in 

 the oldest Devonian and the Upper Silurian. 

 One of these is called the buckler-head or 

 Cephalaspis (Fig. 186). Its head is of the shape 



2n6 



