78 



THE LIAS AMMONITES. 



Pholadomya decorata, Hartm. 



— ambigua, Sow. 



Pleuromya ovata, Romer. 



— Scotica, Wright. 



Unicardium lantlie, d'Orb. 

 Pinna foliuni. Young ^ Bird. 

 Mytilus scalpruni. Sow. 



— numismalis, Oppel. 

 Leda Zieteni, Brauns. 



— Galathea, d'Orb. 

 Cardinia attenuata, Stutch. 

 Avicula novemcostse. Brown. 

 Lima Hermanni, Ziet. 



— eucharis, d'Orb. 



Rhynclionella tetraedra. Sow. 



— furcillata, Theod. 



— variabilis, Schloth. 



Lamellibranchiata. 



Limea acuticosta, Goldf. 

 Inoceramus ventricosus, Sow. 

 Pecten sequivalvis, Sow. 



— liasinus, Ny&t. 

 Plicatula spinosa. Sow. 

 Gervillia Maccullochii, Wright. 

 Gryphsea cymbium, Lamk. 



— obliquata, Sow. 

 Hippopodium ponderosum. Sow. 

 Astarte striatosulcata, Romer. 

 Arcomya vetusta, Fhill. 

 CucuUsea Miinsteri, Goldf. 

 Cardita multicosta, Phill. 

 Plicatula spinosa, Sow. 



Brachiopoda. 



Waldheimia numismalis, Schloth. 

 Spiriferina oxyptera, Buvig. 

 — verrucosa. Buck. 



Pseudoglyphffia, sp. 



Ditrypa circinata, Tate. 



Pentacrinus robustus, Wright. 



Crustacea. 



I Glyphaea, sp. 



Annelida. 



I Ditrypa quinquesulcata, Miinat. 



ECHINODERMATA. 



I Pentacrinus Isevis, Miller. 



Foreign Correlations. — In North Germany the Jamesoni-heds form the base of the 

 Middle Lias, and are, in part, the equivalent of the Numismalis-marl of Swabia. 

 According to the late Dr. U. Schlonbach, who made a special study of these beds, and 

 recorded the results in an exhaustive memoir,' the ironstones of the Middle Lias worked 

 near Harzburg, Liebenburg, Bodenstein, Kalefeld, and Markoldendorf, &c., are obtained 

 from this zone. Aegoceras armatum lies in the lowest stratum, Aeff. Jamesoni and its 

 other associated MoUusca in higher strata, and the upper portion of the marls passes into 

 beds containing Ae(^. Loscombi, Aeg. Valdani, Aeg. fimhriatum, and Amnltheus Ibex, so 

 that the " Schichten des Ammonites Jamesoni " of Brauns include beds which form the 

 whole of the Ibex-h&d& and part of the Ileniegi-heds of this work. Last year I obtained 

 from Hechingen three beautiful specimens of Aeg. Jamesoni, almost exact replicas of the 

 type of this Ammonite which I had from its original locality, the island of Pabba, and, 

 associated with it, from like beds, Aeg. Valdani from the ferruginous marls. Emerson' 



1 "Ueber den Eisenstein des miUleren Lias im N.-W. Deutschland," p. 503, 1863; ' Zeiisclir. d. 

 deutschen geol. Gesellschaft,' Jahrg. 1863. 



" ' Die Liasraulde von Markoldendorf,' p. 27, 1870. 



