State Museum of Natural History. 13 



the Laurentian, the Calciferous sandstone, the Trenton limestone 

 and the Utica slate. A number of specimens from these collections 

 will be available for the State Museum, and the remainder will go 

 into the duplicate material for distribution. The interest in these 

 collections is due to the fact that they illustrate the succession of 

 beds, and the direct contact of the Calciferous sandstone with the 

 Upper Laurentian gneiss, proving the absence of the Potsdam sand- 

 stone along the Mohawk valley. 



A collection of specimens of the iron ores from Essex county has 

 been made for the Museum. , 



Collections Arranged in" the Table-Cases of the Museum. 



A series of specimens from the Utica slate, illustrating the mor- 

 phological development of Triarthrus Becki, has been labeled and 

 arranged in the table-case of the palseontological series. This is the 

 only series of the kind in the Museum, and is a very valuable addition 

 to the collections of fossil Crustacea. 



The largest addition to the arranged collections during the year is 

 from the Niagara group of Waldron, Indiana. The specimens were 

 selected from many thousand examples, and the whole arranged series 

 represents a most complete exhibition of the Niagara fauna of Indiana. 

 It is especially valuable for comparison with the same horizon in New 

 York and elsewhere. This collection contains many typical speci- 

 mens used in the illustration and descriptions of the species, and many 

 very fine examples of other species. With the exception of the Scho- 

 harie collections, it is the largest and most complete representation of 

 the fossils of a single locality in the State Museum. 



A list of these additions is given elsewhere. 



The specimens illustrated on the plates of Lamellibranchiata, in 

 vol. v, part 1, Palaeontology of New York (unpublished), have been 

 numbered and arranged according to the plates, and a partial series 

 selected for the Museum collections. The delay in the publication of 

 this volume has been to the disadvantage of any final work in this 

 series of fossils. The large collection of Devonian Lamellibranchiata, 

 belonging to the State, cannot be made use of for the purposes of dis- 

 tribution, until the publication of this volume is completed. 



A full set of the plates of the Lamellibranchiata, of vol. v, part 1, 

 Palaeontology of New York (as above), with manuscript descriptions 

 of the figures, was sent to the Geological Survey of Kentucky, on ap- 

 plication of Mr. Henry Nettelroth, who has in his charge the prepa- 

 ration of the report upon the fossil Mollusca of Kentucky. 



The Director of the Museum, as State Geologist, has considered it 

 a duty to furnish this information regarding unpublished work, from 



