167 



Mr. Desor exhibited several other drawings of fossils. 

 He also presented in the name of the Geologists of the 

 Survey, a Geological Map of the Lake Superior district, and 

 pointed out and explained its different features. He re- 

 marked that the immense Cedar swamps of that region 

 would probably at some future day be of value for the 

 sleepers of railroads, from the indestructible character of the 

 wood. 



Prof. Rogers gave his testimony to the great truth and 

 value of the map presented. 



Dr. T. M. Brewer presented two specimens of birds' 

 eggs. Among them were the eggs of the two species of 

 Hermit Thrush, exhibiting very different characters, the 

 only perceptible difference between the birds being in the 

 length of the legs. One species builds its nest on trees and 

 has longer legs than the other, which builds on the ground. 

 An egg of the thick-billed Guillemot was among those pre- 

 sented. The parent bird has been sometimes confounded 

 with Uria iroile ; the egg, however, is different, being of a 

 uniform hue, while those of U. troile are not. An egg of 

 Traill's Flycatcher, from Vermont, a rare specimen, was 

 one of the donation. 



A nest, with the eggs of the Yellow-breasted Chat, was 

 presented in behalf of Mr. Theodore Lyman, it being the 

 first known to have been found in New England. 



Dr. J. M. Warren presented a small fish of the genus 

 Holacanthus, usually considered a tropical genus, which 

 had been found on the Beach at Newport, R. L The 

 specimen, from its ossification, appeared to be an adult, 

 and was but little more than an inch in length. 



A bottle containing the following specimens of British 

 Reptiles was presented in the name of Sir William Jardine ; 

 namely, Rana temporaria, old and young, Bvfo vulgaris, 

 Anguis fragilis, and Pelius Berus. 



