254 [Oct., 1S45- 



through the Rotifera and Entozoa, they connect with the Articulata, 

 thus passing by each way, out of the true Radiate type, into that 

 which characterizes the higher sub-kingdoms. The Bryozoa, Ro- 

 tifera and Entozoa, may be arranged in the sub-kingdom Radiata, 

 or with the Mollusca and Articulata, whose types of structure they 

 exhibit, though under a Radiate form. 



The Echinoderms, although so strikingly peculiar in some 

 species — -the Echini — yet through the Holothuria, bear closely upon 

 the Articulata; while the Aealephs incline toward the Mollusca. 



In the above remarks, it is not attempted to trace out all the gra- 

 dations in the groups referred to, but only the most prominent. The 

 animal kingdom is throughout a net work of affiliations, yet there 

 are main trunks and larger branches, to which the smaller anasto- 

 mosing ramifications are subordinate. Much study will be required 

 before the system of nature from the Protozoa up, can be correctly 

 mapped out. 



Mr. Dana read a notice of a new genus of Cyclopidos, 

 named by him Corycaeus. Referred to the following Com 

 mittee: Dr. Leidy, Mr. Haldeman and Dr. Pickering. 



The Chairman read some extracts from a letter recently 

 addressed to him by Prof. Bailey, of West Point, in refer- 

 ence to the skeleton of the Mastodon lately discovered near 

 Newburg, New York. A more detailed account was pro- 

 mised in a future letter. 



Stated Meeting, Oct. 21, 1845. 

 Vice President Morton in the Chair. 



DONATIONS TO MUSEUM. 



Specimen of native copper, from Point Keewenon, Lake 

 Superior. From Dr. Pitcher, of Detroit, through Dr. 

 Morton. 



