700 Systematic Paleontology — Upper Devonian 



VERTEBRATA 



Class PISCES 



Subclass DIPNEUSTI 



Order ARTHRODIRES 



Family COCCOSTIDAE 



Genus GLYPTASPIS Newberry 



The genus Olyptaspis belongs to the order of Arthrodires which in- 

 cludes armored lung fish (Dipneusti) whose head articulates to the body 

 in such manner as to permit free motion. The armor consists of massive 

 plates wliicli protect the skull and the anterior part of the bod}'^, tlie 

 posterior parts being unprotected. The body armor consists of plates 

 arranged dorsally and ventrally. The ventral armor, which is the part 

 best known in this genus, is composed of lateral plates placed on either 

 side of a median ventral plate. The lateral plates are known as the right 

 and left anterior (antero-ventro-lateral) and posterior (postero-ventro- 

 lateral) plates respectively. 



Ghjtaspis is closely related to the genus Coccosteus and, like it, the 

 surface of its armor is set with stellate tubercles. It differs from that 

 genus in having its tubercles arranged in linear rows and in the more 

 shield-like shape of the antero-ventro-lateral plates. It is a member of the 

 family Coccostidce which also includes the gigantic armored fish, Dinich- 

 thys and Tiianichtliys. 



Glyptaspis eastmaxi n. sp. 

 Plate LXXIII, Figs. 1-3 



Description. — This species is represented by antero-ventro-lateral and 

 postero-venti'o-lateral plates. The description of the antero-ventro-lateral 

 plate is as follows : 



Plate triangular, shield-shaped. One margin nearly straight; opposite 

 margin slightly curved; third margin not shown. Surface convex, orna- 

 mented by stellate tubercles, save near the curved margin which was 



