Report of the State Geologist. 43 



To Mr. Walter E. Billings, of Ottawa, Ontario, Can., specimens of 

 Lingula, Elkania, Obolella, Orthisina, Camerella, Zygospira of the 

 Cambrian and Silurian. 



To Mr. B. E. Walker, of Toronto, Ontario, Can., specimens of 

 Orbiculoidea, Orthis flabellum, Stricklandinia of the Niagara. 



To Col. C. C. Grant, of Hamilton, Ontario, Can., specimens of 

 Orbiculoidea . 



To Prof. Thomas Stowell, of Potsdam, N. Y., specimens of Lingula, 

 Orbiculoidea, Orthostrophia, Strophonella, and Strophodonta from 

 the Silurian and Devonian. 



To Prof. W. L. Brownell, Syracuse,. N. Y., specimens of Triplecia of 

 the Trenton limestone, and other fossils. 



To Mr. E. B. Knapp, of Skaneateles, N. Y., specimens of Orthis, 

 Rhynchonella and other fossils from the Tully limestone. 



To Mr. D. S. Chatfield, of Syracuse, N. Y,, a numerous collection of 

 Athyris, Spirifera, Trematospira, Leiorhynchus, Rhynchonella and 

 other fossils, principally of Devonian and Carboniferous age. 



I have elsewhere written that almost at the commencement of 

 this work I secured the services of Mr. Charles Schuchert, as 

 private assistant, with the privilege of having the use of his 

 extensive collection of Brachiopoda, in the preparation of this 

 volume, while his knowledge of this class of fossils has been made 

 available in many ways in the advancement of the work. 



In the progress of the work on volume VIII, one hundred and 

 fifty 'four genera of the Brachiopoda have been discussed in 325 

 pages of text and illustrated on forty-one lithographic plates leav- 

 ing one hundred and six to be treated in the second part of the 

 volume. This latter number will be somewhat increased by the 

 necessity for subdividing some of the groups now included under 

 a single generic name. I have herewith communicated a list of 

 all recognized genera which have been already studied and now 

 form a part of the volume which is nearly completed. This list 

 is so arranged that the comparative value of each term is expressed 

 in the character of the type used, as explained in a prefatory 

 note. 



The Genera of Brachiopoda still requiring final study and 

 revision, especially in some of the groups, are given in a separate 

 list following the first and in uniform type, therefore expressing 

 no opinion regarding their comparative value. 



It may however be proper for me to state in this place that for 

 the illustration of the genera included in this list there are 



