328 Viscount d'ARCHiAC and M. de Verneuil 



siventris, His., and 0. cochlearis, Schlot.* The Actinoceratites and the Conoceratites, 

 from the island of Thessalon in Lake Huron and from Lake Winipeg, are nearly 

 all peculiar to those countries, as we know of only one European species, which is 

 found in Irelandf. The Ormoceratites\, the siphon of which, when cut through, is 

 characterized by singular volutions, belong moreover to the same regions, as well as 

 the Orthostoma communis^ of the state of New York, and the Spirula from Tennessee||. 



Of all the genera which we have as yet recalled to notice, no one has presented 

 so confined a distribution united to so great a local development as the Clymenia. 

 Thus, of forty-three species, three belong to the Silurian formation of Esthonia, 

 according to Professor Eichwald ; and of thirty-nine Devonian, thirty-five are con- 

 fined to the limestones of the Fichtelgebirge, Elbersreath, and Silesia ; and of these 

 thirty-five, three are found in Devonshire associated with four others. It is not 

 impossible that some Goniatites, whose chambers are not known, and which are 

 found in Silesia and upon the banks of the Rhine, may be true Clymenia ; as the 

 beds which contain them also belong to the Devonian system. A single Clymenia 

 has been discovered in the Carboniferous system in Ireland. This genus is absent 

 in the overlying beds intermediate between the Carboniferous system and the 

 muschelkalk ; but one species has been mentioned in that deposit. None are at 

 present known in the oolitic beds ; and some casts referred to this genus from the 

 chalk of Faxoe, seem to belong toNautili; but the tertiary beds contain some species. 



At length the Goniatites close our review of the Mollusca, in presenting to us a 

 greater number of species than any one of the genera we have yet mentioned. 

 Nevertheless they begin to appear only with the latest of the Silurian beds, and 

 in but one single locality, the slates of Wissenbach. Starting from this period, 

 they become extremely multiplied in the Devonian limestones of Gattendorf and 

 Schiibelhammer, and in some other localities of the Fichtelgebirge and Elbersreuth, 

 concurrently with Clymenia and a multitude of Cardiacea, Inocerami, and PosidonicB ; 

 while the Orthoceratites, the Trilohites, and the Trachelipod Mollusca are only to 

 be seen in the beds above them. Goniatites are plentiful enough in the deposits of 

 the same age in Westphalia and in the duchy of Nassau, and in those of the south- 

 west of England. 



The fifty-nine Goniatites of the Carboniferous system are found over a much 



* Orthoceras giganteum of Sowerby, and an undescribed species from the neighbourhood of Valognes, 

 belong also to this division. 



t Bronn. See Mr. Stokes's Mem. Geol. Trans., 2nd Series, vol. i. PI. XXV. and vol. v. Part 3, p. 707, 

 PI. LIX. fig. 1, 1840. 



X Mr. Stokes's Mem. Geol. Trans., 2nd Series, vol. v. Part 3, p. 709, PI. XL. fig, 1. 



§ State Reports, New York, 1838, pp. 115, 119 ; 1839, p. 63 ; 1840, p. 370. 



II Troost, loc. cit. supra 



