264 
PALEONTOLOGY OF NEW YORK. 
With our present knowledge there may also be included in the same group, 
the species described by Meek, from the McKenzie river, as Rensselaria lavis* 
and more recently identified by Whiteaves, in the same region, associated with 
Stringocephalus Burtini, and other characteristic middle Devonian species; and 
also the interesting and abundant form discovered by Professor E. W. Claypole 
in the sandstones of the age of the Hamilton group, in Perry county, Pennsyl- 
vania,f subsequently described as Newberria Claypolii. This shell occurs in great 
quantities both at the locality cited, and in a coarser pebbly sandstone at Pine 
Grove, Schuylkill county, in the same State, a locality which has furnished most 
instructive specimens of both the interior and exterior of the shell. 
There can be little reason to doubt that CEhlert’s Megalanteris inormta 
(d’Orbigny sp.), to which reference has already been made, represents this 
genus in the Devonian of western France. The agreement is found both in 
the detailed structure of the hinge-plate, the arrangement of the muscular 
areas and the character of the vascular sinuses. In default of other evidence, 
it may be considered probable that the Atrypa Deshayesi, Caillaud, A. amygdala, 
d’Orbigny, and Terehratula amygdalina, Goldfuss (Kayser), from the lower and 
middle Devonian of France and Germany, also represent the genus Newberria. 
This genus seems to be a later modification of the RENSSEL^RiA-type of brachi- 
opod structure. The true Renssel^ria, so far as known, closed its existence, in 
America at least, with the disappearance of the fauna of the Oriskany sand¬ 
stone. Ampiiigenia is not known in the faunas succeeding those of the Upper 
Helderberg, while Newberria occurs in the lower and middle Devonian, Hamil¬ 
ton group, and is probably not of earlier age. 
*Not Renssel(£na Icevls, Hall, Pal. N. Y., vol. ill, p. 256. 1859. 
t See Proceedings of the American Philosophical Society, p. 235. 1883. 
