720 



Report of the State Geologist. 



while they appear at the same time (Lias ), when Conularia makes its last 

 appearance in a single species,* after it had furnished only one other specimen 

 in the Trias, f 



* Conularia caticellata, Argeliez, Middle Lias of the Dep. Aveyron. BhII. Soc Geol. France, 2 ser , Tome XIII, 1850, p. 187. 

 t Conularia triaUica, Bittner. Ilohu Wand bei Wiener Neiiatadt Veruaudluugen der K. K. Reicusanstalt, 1878, p. 281, 1890. 



p. 177. 



