t v b. einige Leitfossilien d. Stringocephalenschichten d Eifel. 359 
haltig ist, daß er in unverwittertem Zustande die Schalen 
des Petrefakts unverändert enthält. 
2. Neivberria caiqua Arcli. Tern. 
Taf. VII, Fig. 1-5. 
Da das Armgerltst bei der von Hall 1891 aufge- 
stellten Gattung Newberria noch unbekannt ist l ), so ist der 
Lau des Schlosses und seiner Umgebung wesentlich für 
die Umgrenzung der Gattung. Die hierauf bezüglichen 
Ausführungen des Begründers der Gattung seien hier 
wörtlich wiedergegeben : 
The pedicle-valve has the rostrum produced and in- 
cuived, the apex slightly truncated by the subcircular 
foramen; deltidial plates small and obscure. The teeth are 
comparatively small, projecting forward and gently upward, 
free at their extremities, and supported by narrow dental 
plates which join the bottom of the valve above the 
middle of its length and are continued forward as slender, 
widely divergent ridges upon the inner surface, gradually 
merging into the shell 2 ). 
In the brachial valve the hinge-plate is small, similar 
to that of Eensselaeria and Amphigenici in general form, 
but is of lelatively less size than in the former genus and 
is not perforated by a visceral foramen opening beneath 
the apex. Two very narrow, almost linear and closely 
submarginal dental sockets extend nearly to the apex; 
within tliem lie two broad, subtriangular crural plates, 
which are divided by a triangulär median fissure extending 
to the bottom of the valve. The inner anterior angles of 
1) Daß in der Tat ein Armgerüst vorhanden ist, geht aus 
S. 361 Antn. 3, hervor. 
2) James Hall, An introduction to the study of the 
genera of palaeozoic brachiopoda, Albany NY., 1891, Part II 
S 261. 
