NATURAL SCIENCES OF PHILADELPniA. 105 



others. It had slender jaws, a short symphysis, and rugose, 

 striated teeth, somewhat compressed. The quadrate was con- 

 stricted at its distal end, and had a sharp longitudinal ridge on 

 its lower surface. For this species the name of Crocodilus l[}riii- 

 nelli was proposed. 



The remaining reptilian fossils described by Professor Marsh 

 were also from the Tertiary of Wyoming, and indicated several 

 species of Lacertilia^ some of them of large size. They belong 

 to a new and peculiar genus of lizards, with the head and parts of 

 the body covered with thick, higlily ornamented bony plates, and 

 hence the generic name Glyptosaurus was proposed. The teeth 

 were pleurodont, and in some of the species, at least, short and 

 obtuse. The vertebrre resembled those of Varanus, and the species 

 discovered appear to all have had long tails. Four species were 

 described which could readily be distinguished bj^ the form and 

 ornamentation of the cranial plates, and some of them by other 

 characters. G. .v/Ioesfri^, about four feet in length, had thin, 

 nearl}^ flat, cranial shields, with small irregular tubercles, and 

 articular ventral scutes of the same general pattern. G. nodosus, 

 about three feet long, had more convex cranial plates and thicker 

 frontals. G. ocellafus, at least four feet long, had very thick 

 articular plates, with the tubercles arranged concentricall3% A 

 much smaller species, probably two feet in length, and perhaps 

 genericallj' distinct, was indicated by a number of vertebrae, and 

 jaws, and possibly by some scutes. This was called G. anceps. 



In addition to the reptilian fossils. Professor Marsh exhibited a 

 number of fish remains which were found in the same fresh-water 

 Tertiary basin in Wyoming. Among these were numerous ver- 

 tebrae and cranial bones, evidentlj^ belonging to the genus Amia, 

 and indicating two species about the size of the modern A. calva. 

 One of tliese species, which had the pit of the articular depression 

 in the dorsal vertebrae considerably above the centre, was named 

 Amia Netoherinanus. The other species had vertebra more nearly 

 like the living Amia, but broader, and without the median groove 

 on the lower surface of the centrum. This was called Amia de- 

 jyressus. In the same beds with these specimens numerous other 

 fish remains were discovered, which clearly represented the genus 

 Lejndosfeus, and indicated two species, both having smooth scales, 

 and about the same size as the modern gar-pike. One of these 

 fossil species, which had unusually short vertebrte, was named 

 Lepidosteus glaber. The second species, with proportionally 

 longer vertebrae, was called L. Whitneyi. All the specimens ex- 

 hibited belong to the Yale College Museum, and will soon be 

 described in full, by Professor Marsh, in the American Journal 

 of Science. 



On favorable report of the committee, the following paper was 

 ordered to be published : — 

 1871.] PARTI.— 8 



