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filled with the remains of the life of the Eocene period. Here 

 are some bones of the gigantic Zeuglodon, almost an entire 

 series of the vertebrae of one of which is ranged around the 

 sj^ace for the stairway on the middle of the northern side of 

 the hall. In the same case are many beautiful fossil shells of 

 the Paris basin, and some fine impressions of Fishes from 

 Monte Bolca. The number of specimens in this case is 590. 

 Passing into the south-eastern room, and commencing with 

 the series of wall cases at the right entrance, the visitor first 

 finds the remains of the period in the earth's history next 

 preceding the Tertiary ; viz., the Cretaceous or chalk period. 

 liere the specimens are all of marine origin, and the preva- 

 lence of Echinoderms becomes a prominent feature among 

 them ; about 350 specimens fill the cases of this period ; a 

 large proj^ortion of these were presented by Mr. James M. 

 Barnard. Next in order, as we proceed toward the earlier 

 developments of life, we come to the Jurassic period ; and in 

 the cases devoted to its animal remains are to be found many 

 rare specimens of Echinodenns, of Ammonites and other 

 unique forms, together numbering about 260 specimens, in- 

 cluding some in horizontal cases on the same floor. Then 

 succeed the fossil remains of the Triassic period in the next 

 cases, and these include the splendid collection of the animal 

 impressions uj^on the Red Sandstone of this age belonging to 

 the Society, the first of which have been referred to as adorn- 

 mg the walls of the hall of entrance. Some of the most 

 interesting of these impressions, as well as many good im- 

 pressions of Fishes from the rocks of the same age, may be 

 seen in the horizontal cases upon the floor. The specimens of 

 this period number about 170. We come next to those 

 of the coal period arranged in the succeeding cases, where 

 may be seen the fossil plants from the shales that accompany 

 the coal, to the number of about 225 specimens. To these 

 succeed the remains of the Sub-carboniferous period, about 

 100 specimens ; then those of the Devonian period, about 230 

 specimens ; and finally we come to those of the earliest, tlie 

 Silurian ages, which are represented by many forms of corals, 

 shells and Trilobites, numbering over 500 specimens. The 



