GREGORY: FISH SKULLS 



159 



of the quadrate-articular joint almost directly beneath the orbit. In Cyclothone the jaws 

 have become a huge expanded trap, with all the long bones reduced to slender bars. 



Polyipnus spinosus 



Sternoptyx 



Fig. S2. A. ArgyropeUcus and B. Sternoptyx. Enlarged from young specimens cleared and stained by Miss Gloria Hollister for 

 Dr. William Beebe. C. Maurolicus pennant:. After Bigelow and Welsh. 



Regan and Trewavas (1930, p. 44) show that in certain of the Stomiatidae, "the loose 

 attachment of the palatine in front and the ectopterygoid behind permit their movement 

 forward and backward, and that of the upper jaw which is rigidly connected with them." 

 In these forms (Eustomias) the cervical portion of the column is bent into one or two loops 

 and the vertebrae are more or less replaced by an incompletely ossified region which acst 

 as a shock absorber during the protraction of the jaws in wrestling with large prey (p. 46). 



