BUFFALO SOCIETY OF NATURAL SCIENCES 175 



principal and lateral gulars in position. This part of the anatomy 

 is of course known in other species of the genus, e.g., from the Old 

 Red Sandstone of Scotland. 



E 2529 Gplar region of a large fish (fig. 58). It shows the principal 

 and lateral gulars very prettily, and on the outside of 

 these, the mandibles. Most of the bone is gone but the 

 impressions of the plates are clearly indicated. The 

 lower parts of both cleithra are preserved. Between 

 their extremities and back of the principal gulars are a 

 number of imbricating scales. Preserved fragments of 

 the bone of both the principal and the lateral gulars, 

 show that these plates were ornamented with small, 

 crowded tubercles which were not coalesced into lines. 

 The scales immediately back of the gulars are for the 

 most part ornamented with tubercles, which in some 

 scales are more or less coalesced into lines. 



Upper Devonic; Scaumenac Bay, near Village of 

 Megouasha, Quebec. Collected by W. L. Bryant. 

 August, 1915. 



E 2530 Gular region of a smaller fish than the preceding. Both 

 the principal and lateral gulars are shown, the bone being 

 present and viewed from the inner or visceral aspect. 

 The arrangement is very similar to that of the preceding 

 specimen. There are five or more lateral gulars on 

 either side. 



Holoptychius americanus Leidy 



E 2151 Cast of a large scale. 



Chemung; Tioga County, Pa. 



E 2544 Impression of scales. 



Catskill; Seeley Creek, branch of Lambs Creek, 

 Mansfield, Tioga County, Pa.; collected by W. L. 

 Bryant. 



Holoptychius giganteus Agassiz 



E 2531 Scales, fin-rays and a head plate (?). Length of scale 22 

 mm.; width, 25 mm. 



Other data same as preceding. 



