214 



bulletin: museum of compakative zoology. 



former's ideas as to the relations of Homosteus having been published 

 as early as 1872. 



Figure A. 



Outline sketch showing the position in which the constituent parts of the dentition were 

 embedded with respect to the headshield in the block of shale containing the single 

 individual of Mylostoma variabile juv. Museum Comp. Zool. (Cat. 1490); Amer. 

 Mus. Nat. Hist. (Cat. 7526). X \. (After Dean.) 



Dean's Interpretation. — To Professor Bashford Dean belongs the 

 credit of having attempted the first serious and thorough-going restoration 



