wat.cott.] PALEONTOLOGY APPALACHIAN. 151 



ders were of Upper Cambrian age while those of the limestone ma- 

 trix, which resembled in character the limestone of the bowlders, was de- 

 posited in situ, and carried the Oalciferous fauna. As far as I have 

 been able to separate the species by a study of the material from the 

 bowlders and the limestone matrix the following may be referred to the 

 Upper Cambrian or Potsdam fauna : Camerella calcifera ?, Agnostus 

 americanus, A. orion, A. canadensis, Dikelocephalus magnificus, D. plani- 

 frons, J), belli, D. oweni, D.megalops, D. cristatus, Arionellus cylindricus, 

 A. subclavatus, Menocephalus sedgiHcki, M. globosus, Conocephalites zen- 

 Jceri, Asaphus illcunoides. 



Mr. T. Devine, of Quebec, having d iscovered several nearly perfect 

 trilobites in the conglomerate limestone at Point Levi, described two 

 "species of them. One as Olenus f logani, 1 the other as Menocephalus sal- 

 teri. 2 In a footnote accompanying the description of Olenus I logani 

 Mr. Billings states that the species is unquestionably congeneric with 

 those which he had described as Dikelocephalus belli and J), oweni from 

 the same locality. 



To the species described from Point Levi in 1860 Mr. E. Billings 

 added in 1865 3 Dilcelocephalus devinei, D. hisingeri, I). affinis, D. sesos- 

 tris, D. selectus, and 1). pauper. He also figured in this connection Ole- 

 nus f logani, Devine and Menocephalus salteri, Devine. 



In 1872 Mr. Billings returned to the study of the fossils of the older 

 Paleozoic rocks and described one new genus and several species found 

 in bowlders, of several beds of conglomerate at St. Simon, below Que- 

 bec, as follows: The genus Obolella and the species Obolella gemma and 

 0. circe, Platyceras primcvvum, Hyolithes americanus, H. communis, H* 

 princep\, H. micans. On page 240 of the same volume the genus Hyo- 

 lithellus is proposed for the species Hyolithes micans ; and on page 351 

 he notes the discovery of Salterella pulchella in the Winooski marble 

 of Vermont. 4 



The Cambrian fauna of northern Vermont was further enlarged in 

 1884 by Prof. R. P. Whitfield 5 describing Orthisina orientalis (p. 144), 

 Nothozoa vermontana (p. 144), Dikelocephalus, marcoui (p. 150), and 

 Angelina hitchcocki (p. 148); all of which were referred by him to the 

 horizon of the Potsdam sandstone. 



The oldest Phyllopod crustacean, Protocaris marshi, was described 

 by Mr. C. D. Walcott 6 in 1884 from the Georgia slates of Vermont, 



1 Description of a new trilobite from the Quebec group. Canadian Nat., vol. 8, 1863, p. 95. 

 2 Op.cit.,p.210. 



3 Paleozoic Fossils, vol. 1, 1865, pp. 195-200. 



4 On some new species of Potsdam fossils. Canadian Nat., vol. 6, new ser., 1872, pp. 213-226, 240. 

 Note on the discovery of fossils in the "Winooski Marble" at Swanton, Vermont. Am. Jour. Sci., 



3d ser., vol. 3, 1872, p. 145. Canadian Nat., new ser., vol. 6, 1872, p. 351. 



'Notice of some new species of Primordial fossils in the collections of the Museum, and correction 

 of previously described species. Am. Mus. Nat. Hist. Bull., vol. 1, 1884, pp. 139-154. 



6 On the Cambrian faunas of North America ; preliminary studies. U. S. Geol. Survey, Bull. No. 10, 

 1884, p. 50. 



