preserved a year in spirits, it was sent to Mr. Batcheldcr, who 

 prepared from it the above description. 



Prof. H. D. Rogers submitted to the Society some verbal 

 remarks upon the bones of the Zeuglodon, recently exhibited 

 in Boston, under the name of Hydrarchos, by their proprie- 

 tor, Dr. Koch. 



Prof. R. mentioned, that, among the loose bones not arranged 

 with the skeleton, he discovered two specimens of the Cochlea of 

 the ear, and he described them as approximating very closely, in 

 form and structure, to the similar bone in the organ of hearing of 

 the whales. They are about the size of a small lemon, and dis- 

 play that variety of the whorled or convoluted form of the cochlea 

 peculiar to the cctacea. This analogy, and their wide deviation 

 from the type of the organ as found in reptiles, he regarded as an 

 interesting confirmation of the decision of Prof. Owen, of London, 

 that this animal, the Basilosaurus of Harlan, is no saurian^ but a 

 true cetacean. It was furthermore stated that the two cochleae 

 were of different dimensions, and therefore, since no animal has 

 ears of unequal dimensions, this fact is an evidence of their having 

 belonged to two distinct individuals. 



A paper from Professors Henry D. and William B. Rogers, 

 on two remarkable Boulder Trains, in Berkshire Co., Mass., 

 was then read by the first named gentleman. 



After referring to the importance of the phenomena in connec- 

 tion with the interesting question of the origin of the drift, and 

 mentioning the descriptions already given by Dr. Reid and Dr. 

 Hitchcock, tbe authors proceed to detail their observations made 

 in August last, and to present their own explanation. 



These Boulder Trains they describe as starting from the sum- 

 mit of a high ridge in Canaan, New York, each from a particular 

 depression ; ranging in a direction about S. 35° E., across other 

 even higher ridges and their intervening valleys ; the longer train 

 a distance of twenty miles, and the shorter ten miles, about half a 

 mile asunder, and neither of them more than 300 or 400 feet in 

 breadth. The blocks are of great size, from 5 to 20 feet in dia- 

 meter, are angular and free from diluvial scratches, and, unlike 

 the rounded boulders, are confined to the surface. They all con- 



