﻿Cephalopoda of the Cincinnati Group. 



251 



A review of the class and descriptions of nine new and one old species 

 of Orthoceras, two new species of Cyrtoceras, two species of Endoceras and 

 one Trochoceras. This partly covers the ground of the present paper and 

 seems to be the first attempt toward the collection of the descriptions of 

 the genera and species of the class. There are figures in outline of most 

 of the new species. 



1878. Miller, S. A. Journal of the Cincinnati Society of Natural History. 

 Vol. I. 



Description of Cyrtoceras amoenum, (page 105). 

 1878. James, U. P. Palaeontologist. No. 1. 



Description of Orthoceras hindei, (page 1). 



1878. Miller, S. A., and Dyer, C. B. Contributions to Palaeontology. 



No. 2. 



Descriptions of Troclwlites circularis and T. minusculus (pages 10 and 

 11), (see under Lituites.) 



1879. Hall, James. Cephalopoda of Up. Helderberg, Hamilton, Por- 



tage and Chemung groups. Palaeontology of New York, vol. V, 



part 1, pages 217 to 480. 

 This account opens with an historical sketch of the genus Orthoceras, 

 in the course of which mention is made of the American species of the 

 genus described since 1823, comprising a full bibliography of the subject. 

 This is followed by some remarks on the genus and its allies, and by 

 descriptions of twenty-one old species, forty-six new ones and one new 

 variety. The genera Bactrites, Gomphoceras, Cyrtoceras, Gyroceras, Trocho- 

 ceras, Nantilis and Goniatites are taken up and treated in the same way. 

 The volume of plates makes part 2 of vol. V. 



1880. Woodward, S. P. A Manual of the Mollusca; London, 1880. 

 Definitions of genera of fossil Cephalopods are given on pages 168 



to 201, with a description of the living Nautilus. In the appendix Ralph 

 Tate gives fuller descriptions of some genera, and a few new ones are 

 added in the first 1 2 pages. Most of the genera are represented by a 

 figure of one species at least. 



1880. Miller, S. A. Journal of the Cincinnati Society of Natural His- 



tory, vol. III. 



Re-descriptiom and figure of Orthoceras Dyeri. (page 236.) 



1 88 1. Wetherby, A. G. Journal of the Cincinnati Society of Natural 



History, vol. IV. 



Description of Cyrtoceras conoidale (page 78), (see under C. vallan- 

 dighami), and C. irregulare (page 79). 



1 88 1. White, C. A. In Eleventh Report of State Geologist of Indiana. 

 Description and figure of Orthoceras annitlatum (page 358). 



