NATURAL SCIENCES OF PHILADELPHIA. 123 



June \st. 

 The President, Dr. Hays, in the Chair. 



Twenty-one members present. 



Prof. Cope exhibited some specimens of extinct reptiles of interest. One 

 of these was the cranium, minus a portion of the muzzle of a gavial, from the 

 New Jersey Green Sand, previously described under the name of Thoracosau- 

 rus brevispinus, hat which this specimen demonstrated to belong to another 

 genus, since it did not present the lachrymal foramina of the former. He 

 applied the name Holops to it, and stated that he had evidence that Crocodi- 

 lustenebrosus Leidy, and probably C. o b s c u r u s L., also belonged to it. 



He also exhibited drawings with measurements of portions of the limbs of 

 a very large Dinosaur, in the collection of Dr. Samuel Lockwood, of Keyport, 

 Monmouth County, N. J. It was discovered by this gentleman in the lower 

 cretaceous clays on the shores of Raritan Bay. It consisted of the extremity 

 of the tibia with astragalus and fibula. He said it indicated the second genus 

 of his suborder Symphj'poda, and was thus allied to Compsognathus, differing 

 in the remaining indication of suture between astragalus and tibia, which dis- 

 appeared in Compsognathus. The astragalus thus entirely anchylosed was 

 also confluent with the calcaneum, forming a continuous condyloid surface for 

 the tibia. In an anterior projection externally, the extremity of the fibula re- 

 posed by a condyloid extremity, the shaft lapping over the outline of the tibia. 

 This demonstrated what he had already stated, that the fibulae of Iguanodon 

 and Hadrosaurus had been reversed. The length of the fragment was sixteen 

 inches, the fractured section was a transverse oval, the medullary cavity nearly 

 filled with cancellous tissue. The transverse width of the extremity 12 in.; 

 oblique diameter 14 in. This form he called Ornithotarsus im m an i s, and 

 placed it between Hadrosaurus and Compsognathus. 



He made some observations on a fine fragment of the muzzle of a large 

 Mosasauroid, which pertained to a cranium of near five feet in length. The 

 pterygoid bones were separated from each other, and support nine teeth. A 

 peculiarity of physiognomy was produced by the cylindric prolongation of the 

 premaxillary bone beyond the teeth, and a similar flat prolongation of the ex- 

 tremity of the dentary. He referred the species to Macrosaurus Owen, under 

 the name of.\I. proriger. The specimen he stated belonged to Prof. Agassiz, 

 who obtained it from Western Kansas, probably from the No. 3 of the Upper 

 Cretaceous of Hayden. 



The follo^nng paper was presented for publication : 



" Description of new Carboniferous Fossils from the United 



States." By F. B. Meek and A. H. Worthen. 



Mr. Jeanes having resigned his position as Auditor, on motion, 



Dr. Bridges was nominated and elected to fill the vacancy. 



June 8th. 



The President, Dr. Hays, in the Chair. 



Twenty-seven members present. 



The following paper was presented for publication : 



" On the production of Bractese in Larix." By Thos. Meehan. 



June lofh. 

 Prof. Frazer in the Chair. 

 Twenty-four members present. 

 1869.] 



