258 C. SCHUCHERT — LOWER HELDERBERG-0 RISK ANY FORMATIONS 



The following German Lower Devonic faunas and their American 

 equivalents are based on Freeh's " Lelhxa geognostica " (1897). The lists 

 do not indicate the entire faunas. 



1. Gedinnian, fauna of the lowed Lower Devonic, or zone of Spirifer mercuri 



Germany. 

 Orihis vemeuili (cf. 0. elegantula). 



Spirifer mercuri Gosselet. 

 Renssdxria strigiceps Roemer (this is no 

 Rensselaeriii, probably a pentameroid). 

 (I'rammi/sia deornala. 

 Tentaculiies irregularis de Koninck. 

 Beyrichia richteri de Koninck. 

 Primil'm jonesi de Koninck. 

 Homalonotus richteri de Koninck. 



American. 



0. (DalmaneUa) planiconvexa or quad- 

 rang Hall. 



S. perlamellosus Hall. 



This meager fauna occurs near the base of the Gedinnian, and there is 

 nothing in it that can be successfully compared with American Devonic 

 horizons. The few American species cited are of Lower Plelderberg age, 

 and while the German Gedinnian may be the equivalent, it seems best 

 at present to defer a positive correlation. 



2. Si eg en, fauna of the Siegen gramoacke, or zone of Spirifer prhnxvus 



Germany. 



( nonetes sarcinulatus. 

 Orihis personata Krantz. 

 Ortliis circularis Schnur. 

 Strophomena murchisoni Verneuil. 

 Slrophomena sedgwichi Verneuil. 

 Slreptorhynchus gigas McCoy. 



Cyrtina heteroclita Def ranee. 

 Spirifer pHmxvus Steininger. 



Spirifer hystericus Schlotheim (= S. mi- 



cropterus Goldfuss). 

 Spirifer bishqfi Giebel. 



Alhyris undata Defrance. 



Rhynchonella daleidensis F. Roemer. 



American. 

 Chonetes mdonica Billings. 



Stropheodonta magmventra Hall. (Freeh 

 compares Hipparionyx proxiimis Van- 

 uxem.) 



C. roslrata Hall, C. a finis Billings. 



S. murchisoni Castelnau or S. arrectus 

 Hall. 



This form of Spirifer, with the fold and 

 sinus somewhat plicated, does not 

 begin in America before the Oris. 

 kany. 



This is an Athyris of which A. ful- 

 tonensis of the Middle Devonic is the 

 best known. 



