﻿Cephalopoda of the Cincinnati Group. 



249 



examined, that its whorls are coiled and in the same place [plane ?] it 

 would belong either to the genus Lituites, or to some other section of the 

 genus Nautilus, as the latter group is understood in its less restricted sense, 

 and of course have to take the name Lituites Baeri or Nautilus Baeri." 

 The former of these two names is the one here given it. 



4. L. ammonius, Conrad. 



Trocholites ammonius, Con. 1838. Sec. Ann. Rept. Geol. Sur. of 

 N. Y., p. 119. Hall. Pal. N. Y., I, pp. 192 and 309. PI. 40 A, figs. 

 4 a to k., and PL 84, fig 2 a b c. 



Shell discoidal ; volutions rounded, slightly concave on ventral side, 

 gradually enlarging towards aperture; septa direct, or undulated on dorsal 

 side ; surface with more, or less distinct irregular transverse stria or ridges ; 

 outer chamber large; siphuncle central. 



Locality : Cincinnati. 



BIBLIOGRAPHY. 



1732. Breynius, J. P. H. De melonibus petrefactis montis Carmel vulgo 

 creditis et de polythalamiis nova testaceorum classe. 

 Containing descriptions of the genera, Nautilus, Lituites, and 

 Orthoceras. 



1 81 8. Sowerby, J. Mineral Conchologv. 



Description of Orthoceras annulatum. Tab. 133. 

 1832. Goldfuss. De la Beche, Handbuck der Geognosie, nach der 2, 

 Auflage des Engl. Originals bearbeitet von H. v. Dechen (die 

 Petrefakten-Verzeihnisse darin von Goldfuss). 

 Description of Cyrtoceras. 

 1838. Conrad, T. A. Second Annual Report of the Geological Survey 

 of New York. 



Description of genus Trocholites and species T. ammonius, page 119. 



1838. Stokes, Charles. Transactions of Geological Society of London. 



Second series, Vol. V. 

 Description of Ormoceras. 



1839. Brodie, P. B. In Murchison's Silurian System, Vol II, page 621. 

 Description of Bhragmoceras. 



1839. Sowerby, J. Murchison's Silurian System, Vol. III. 



Description of Gomphoceras. Page 620. 

 1842. Conrad, T. A. Journal of the Philadelphia Academy of Natural 

 Sciences, Vol. VIII. 



