Cope.] "^^^ [June 17, 



honeycomb-like cells of irregular polygonal form — for the most part long 

 in the direction of the length of the centrum, and divided by exceedingly 

 thin and compact films of bone," etc. The structure in the subject of 

 the above description is spongy and light, but much closer. Lselaps offers 

 a much closer resemblance to Ornithopsis in its exceedingly coarse struc- 

 ture ; while in Megadactylus, lumbar vertebrae appear to be absolutely 

 hollow. 



Had Dr. Seeley been acquainted with these genera, he would 

 probably have referred Ornithopsis to the Goniopod Dinosauria, rather 

 than to the Ornithosauria. Prof. Cope added that he had already (Aug. 

 1869,) published the view that the bone described previously as a quad- 

 ratum of Iguanodon, (the type of Seeley' s Ornithopsis), was evidently not 

 a cranial bone, and that he had always supposed it to.be a vertebra. 



The reptile represented by the above vertebrae was named Pneumato 

 arthrus peloreus; tlie possibility of its being found to be Ornithotarsua 

 being entertained, though the near resemblance of the bones to those of 

 a tortoise could not be overlooked. The specimens were discovered by 

 Dr. John H. Slack, in Monmouth Co., N. J. 



Prof, Cope exhibited also seven Australian skulls and one 

 Maori skull, probably tbe first seen here. 



Pending nominations, Nos. 651 to 659 were read. 



And the Society was adjourned. 



Stated Meeting, July 15, 1870. 



Present, four members. 



Dr. GrENTH in the Chair. 



Letters of envoi were received from various correspond- 

 ents. 



Letters of acknowledgement for the receipt of No. 83 were 

 received from the Essex and Smithsonian Institutes, Massa- 

 chusetts, New York, New Jersey, and Georgia Historical So- 

 cieties, Cambridge Museum, and New York Lyceum ; Nos. 

 77 to 80, E. Danish Society ; 77 and XIIL 2, ZooL Bot. Soc, 

 Vienna ; 78—80, Physical Society, Berlin ; 76—80, Nassau, 

 N. H. Association. 



Donations for the Library were received from the Acade- 

 mies at St, Petersburgh, Berlin, and San Francisco; the Insti- 



