224 



THE CAMBRIAN. 



[BULL. 81. 



In the same year Prof. James ITall read before the Albany Institute 

 a preliminary notice of the fauna of the Potsdam sandstone, with re- 

 marks upon the previously known species and descriptions of some new- 

 ones from the sandstone of the Upper Mississippi Valley. This was first 

 published in the Sixteenth Report of the State Cabinet of Natural His- 

 tory in l^()'o, and in 1807 in the Transactions of the Albany Institute. 

 The new genera and species described are as follows: 1 



Lingula winona, p. 126. 



mosia, p. 126, 



aurora var., p. 127. 

 Piscina (?) inntilis, p. 130. 

 Or this pepina, p. 134. 

 Platyceraa primordialis, p. 136. 

 Eiioinphalus (.') vatu-iiuis, p. 136. 

 Dikelocephalou oiiu nesotensis 



var. liinbatus, p. 141. 

 Dikelooephalas niinnesotensis 



var., p. 141. 

 Dikelocephalus spininger, p. 143. 



misa, p. 144. 



osceola, p. 14(i. 

 Conocephalitea eos, p. 151. 



persons, p. 153. 



shuinardi, p. 154. 



nasutus, p. 155. 



oweni, p. 155. 



eryon, p. 157. 



anatinns, p. 158. 



patorsoui, p. 159. 



? binodosns, p. 160. 



winona, p. 161. 



diadematus, p. 167. 

 Plycliaspis sp.?, p. 174. 

 Chariocephalus whit liolcti, p. 175. 

 IllaMiurus qaadratus, p. 176. 

 Triarthrella auroralis, p. 177. 

 Aguostus joscpha, p. 178. 



parilis, p. 179. 



disparilis, p. 179. 

 Aglaspis barramli,p. 181. 

 Pemphigaspis bullata, p. 221. 

 Ampbiou? matutina, p. 222. 

 Conocopbalitos ¥ (Arionellus ?) 



dorsal is, p. 222. 

 Conocephalites optatus, p. 222. 



Of species previously described he redescribed and illustrated : 



Graptolitbns hallianns, Prout., as Dendrograptus ballianus, p. 124. 

 'Lingula ampla, Owen, p. 125. 



aurora, Hall, p. 126. 



piuuaformis, Owen, as Liugnlepis pinnaforinis, p. 129. 

 Obolus apolliuus Owen, as Obolella? polita, p. 133. 

 Lingula? polita Hall, as Obolella? polita, p. 133. 

 Theca primordialis Hall, p. 135.* 

 Serpulites nmrchisoni, Hall, p. 136.* 3 

 Dikelocepbalus niinnesotensis, Owen, p. 138. 



pepinensis, Owen, p. 142. 

 Conocephalites minor, Shumard, p. 149. 



minutus, Bradley, p. 150. 

 Dikelocepbalus iowensis, Owen, as Conocephalites iowensis, p. 162. 

 Crepicephalus? wiscousensis, Owen, as Conocephalites winconseusis, p. 164. 

 Lonchocepbalus hamulus, Owen, as Conocephalites hamulus, p. 166. 

 Arionellus bipunctatus, Shumard, p. 169. 

 Dikelocephalus miuiseaensis, Owen, as Ptychaspis miniscaensis, p. 171. 



granulosus, Owen, as Ptychaspis granulosa, p. 173. 



Agnostus orion (1) Billings, noted by Shumard, is described as Agnos- 

 ias joscpha (p. 178). The genus Dikelocephalus is redefined (p. 137), 



1 Preliminary notice of the fauna of the Potsdam sandstone, with remarks on the previously known 

 species of fossils and descriptions of some new ones from the sandstone of the Upper Mississippi 



Valley. 16th Ann. Rep Regents Tniv. State Cab. Nat. Hist., 1863, pp. 119-220. Albany Inst, Trans., 

 vol."). 1807, pp. 93-195. 

 1 Tages 135, 136 each have an asterisk (') placed after thorn to indicate interpolated pages. 



