288 ANNUAL OF SCIENTIFIC DISCOVERY. 



persed. He also presented specimens of fossils, taken from two boul- 

 ders of rocks in the drift of Orange, N. J., which belong, generally, to 

 the Delthyris limestone and Oriskany sandstone of the New York sys- 

 tem. These boulders must have had their origin at some point not less 

 distant than the valley of the Rondout, the nearest outcrop of these 

 rocks, having thus been carried over the highlands by the active agencies 

 of the drift period. 



DISCOVERY OF ANOTHER HUGE FOSSIL REPTILE. 



DR. MANTELL has added to his interesting discoveries of fossil liz- 

 ards, an arm-bone, or humerus, fifty-four inches long. " It is closely 

 allied, in form and proportion, to the humerus of a crocodile." Dr. 

 M. has sent to the Royal Society a memoir on the subject of this new 

 species, and it will probably be soon published. Sillimari's Journal, 

 Jan., 1850. 



ON THE GENERA OF MOSASAURUS. 



ACCORDING to Dr. Gibbes, of South Carolina, remains of eight spe- 

 cies or genera of mosasaurus have been found in the United States. 

 The relics found in New Jersey have been determined by Professor 

 Agassiz to belong to only one species. Those of another species were 

 found on the Upper Missouri, and have been carried to Europe. These 

 remains were very perfect and valuable, and are now in the Museum at 

 Bonn. Dr. G. has described a small species from Alabama, another 

 from South Carolina, and a third from Georgia. Three genera of mosa- 

 sauroid fossils, from Alabama and South Carolina, have been also found 

 and described. 



INFUSORIAL DEPOSITS ON THE RIVER CHUTES, IN OREGON. 



IN a paper on this subject, read before the Academy of Berlin, 

 Ehrenberg first draws attention to the results of his former researches, 

 that the rocky mountains are a more powerful barrier between the two 

 sides of America than the Pacific Ocean is between America and China ; 

 the infusorial forms of Oregon and California being wholly different 

 from those of the east side of the mountains, while they are partly iden- 

 tical with Siberian species. This fact is confirmed by his examinations 

 of earth from the gold region of California, and from the Chutes River 

 of Oregon, obtained by Fremont. The latter deposit is situated at an 

 elevation of 700 or 800 feet, and constitutes a bed, 500 feet thick, of 

 porcelain clay. It is overlaid by a layer of basalt 100 feet thick. 

 Ehrenberg has made out seventy-two species of polygastrica, with sili- 

 ceous shells, sixteen species of phytolythuriens, and three of crystalline 

 forms. The Discoplea and Raphoneis Oregonica are the only two spe- 

 cies characteristic of the locality. The beds are more recent than those 

 of the Klackamus River, a few miles from the falls of the Willammet. 

 Sillimari's Journal, Jan., 1850. 



