100 A. 8. Williams—Fauna of the Chemung Group. 
In 1860, Professor Hall described a form from the Goniatite 
beds of Indiana, under the name Rhynchonella (Eatonia) obso- 
lescens (18th: Rept. on Cabinet N. Y., p. 111). This species 
cannot be distinguished, so far as the description goes, from 
i is pugnus Martin, later recognized in the same beds by 
ee 
In a paper read before the Iowa Academy of Sciences, in 
1877, Prof. S. Calvin described, under the name Rhynchonella 
alta, a species from the Iowa beds. Specimens of this form, 
lately examined by the author, are identical with the variety of 
. pugnus met with in the Ithaca beds. This Rhynchonella 
is a peculiar type and is easily distinguished from anything 
else appearing in the Upper Devonian, or Lower Carboniferous 
of America. 
The representative met with in the High-point beds (Naples, 
N. Y.), as before mentioned, offers varietal differences in which 
it approaches the European forms, called R. acuminata. One 
specimen is almost identical with the figure of R. acuminata 
Martin, var. mesogonia Phill., given by Davidson on Plate xxi, 
fig. 3, of his British Carboniferous Brachiopods. It differs from 
the other representatives of this type before mentioned, in 
greater and more angular production of the median fold, and 
in the sharpness of the plications of this fold, but it differs 
from the typical 2. acuminata Martin in the possession of threo 
distinct, but very short, plications at the margin, outside the 
median fold, a character distinguishing R. pugnus from &. acu- 
minata. Of the same type, and it may be same species with 
above, are #. Hatonieformis McChesney, of the Coal-measures 
of Illinois, Zerebratula Rocky-montana and T. Uta of Marcon, 
from the Carboniferous of Salt Lake City, Rhynchonella Osagen- 
sts Swallow, of the Carboniferous of Missouri, and of Danville, 
Illinois, and “ Camarophoria globulina Phillips,” as identified by 
Geinitz, from the Carboniferous at Nebraska City. The typi 
cal 2. acuminata and R. pugnus Martin are found associated in 
British and European Carboniferous beds, and appear in the 
Devonian. 
America. These are Rhynchonella pugnus Martin, Productus 
dissimilis Hall, Fistulipora ocetdens Hall and Zaphrentis solida 
