274 PROCEEDINGS OF THE ACADEMY OF 



Pbocsena brachycium, The Northern Porpoise. 

 Delpbinus clymene, Dolphin. 



tursio, Black Dolphin. 



Hyperodon semijunctus, sp. nov., Southern Bottle-nose. 

 The remaining species are as yet undetermined. 



He also alluded to the existence of several species of White Whales, probably 

 confounded hitherto, owing to their uniform coloration. Similar uniformity 

 exists in various genera, as Corvus, Chasmarhynchus, etc. A species brought 

 by Dr. 1. 1. Hayes, from Upernavik, was called B. r h i n o d o n, and a large one 

 presented by Dr. E. K. Kane was characterized under the name B. concreta. 



Dr. I. I. Hayes stated that the two skulls, mentioned by Prof. Cope as be- 

 longing to the genus Beluga, brought by him from Greenland, were obtained 

 from the Governor of Upernavik, as those of the White Whale. He also ob- 

 served, that during his voyage he had seen the White Whale abundantly as 

 far north as 78 N. lat. 



December 19/A. 



The President, Dr. Bridges, in the Chair. 



Twenty-nine members present. 



Prof. E. D. Cope exhibited some large, fresh specimens of Accipenser s er o t i- 

 n us Raf., Scaphirhynchops p 1 atyrhynchus, Polyodon fo li u m, and Buba- 

 lichthys taurus from the Ohio. In regard to the geographical distribution 

 of fishes, he alluded to the species of the streams of the lowlands of late for- 

 mation near the coast in New Jersey, Delaware, and southward, as being to a 

 considerable extent different from those of the streams which descend through 

 the rolling country which lies between this and the first ridges of the Alle- 

 ghenies, a distribution repeating points observed among the plants. The 

 characteristic types are 



Ambloplites pomotis, Hololepis erochroiis, 



Bryttus obesus, Aphredoderus sayanus, 



chaetodon, Melanura annulata, 



Apeltes quadracus, Hybognathus procne, 



and certain species of Cyprinodontidfe. Stilbius americanus and Moxos- 

 toma oblongum find a most congenial habitat in these sluggish streams, 

 though common species of the upper country ; but the Exoglossum, Rhinich- 

 thys, Semotilus, ( = Ceratichthys) are wanting, or very rare. Esox reticulatus i3 

 most especially abundant. 



Of the list given, the Hybognathus occurs in still coves about dams in the 

 bill country, and Bryttus chaetodon, he was informed by J. Burke, had 

 been taken in a pond near Bristol., Pa., near the Delaware. Other than these 

 he knew of no example of the above species occurring in the upper country. 



December 2Q(h. 



The President, Dr. Bridges, in the Chair. 



Twenty-three members present. 



On report of the respective Committees, the following papers were 

 ordered to be published : 



[Dec. 



