Report of the State Geologist. 



881 



writer, as well as for affording evidence of their structural 

 development. 



Appreciating the want of material from the Waverly group, not 

 only for the study of their generic characters and significance, but 

 for obtaining a knowledge of the geographical and geological dis- 

 tribution of species in this series, the writer engaged the services 

 of Mr. TVm. F. Cooper, of Granville, on his personal account. Mr. 

 Cooper has made a general collection of the fossils of that part of 

 the country, without regard to special classes or orders, carefully 

 marking the horizons from which they have been derived. This 

 collection when carefully studied will afford much information 

 upon the points above indicated. 



Returning home in July, my time was devoted to the arrange- 

 ment of the Brachiopoda in my possession, to selecting specimens 

 for the draughtsman, and to the preparation of some plates of 

 drawings for the lithographer ;* during all the time continuing my 

 correspondence with collectors in different parts of the country, 

 Resuming my itinerary again early in October, I visited and exam- 

 ined a collection belonging to Mr. Edmond DeCew, of DeCewville, 

 Ontario. This collection is chiefly from the Oriskany sandstone 

 and corniferous limestone of the neighboring country. Since this 

 collection wa3 offered for sale at a very moderate price, I have 

 examined and reported upon its contents somewhat in detail, 

 giving a list of the species it contains, as will be seen by my com- 

 munication already made to the committee upon the State Museum 

 sometime recently. 



At Delaware, Ohio, Prof. Nelson, of the Wesley an University, 

 very kindly gave me access to the collections of the university 

 but since these were not particularly rich in Brachiopoda, I was 

 able to select but a few specimens which were available for our 

 object. 



At Waynesville, I examined the collection of Mr. Israel Harris 

 which is very abundant in species of the Hudson River (Cincin- 

 nati) group. I obtained from Mr. Harris the loan of some speci- 

 mens of Trematis, which will aid in the illustration of the genus. 



The collection of Mr. Harris is strictly local in its character and 

 in this respect is far the most extensive of any one I have seen in 

 Ohio. The collections of the Crustacea, Crinoidea and other 



* Plates xxv, xxvi. xwii utid xxviii were placed in the hands of the lithographer dur- 

 ing the mouths of August and September, 1888. 



