lUS 77/' Allirricilii GcOhHjht. October, 18511 
lion, ill llu" lirst t-aso al least, lias received almost startling eonflr- 
luation by these discoveries of Dr. Beeclier and Mr. Schuchert; 
and in the second case a good beginning has been made l)y Dr. 
Herman llerzer. who recently sent me a (quantity of shales and 
limestones, from the Coal Measnres of Ohio, that are largely 
composed of the shells of Ostracoda. 
In the present paper 1 am obliged to restrict my observations to 
a small but very remarkable group of species, not represented, 
so far as we know, outside of the Lower Ilelderljerg rocks of 
New York. They seem clearly to indicate a new genus tluit 1 
propose naming Btccherelht, in recognition of the discoverer's 
paleontological labors. From a collector's standpoint, a -striking 
feature about these species is the rarity of the individuals rep- 
resenting the six or seven distinguishable forms. Of only one 
have we as man}- as five valves, while of the others the number 
seen is three, two, or only one! 
The associated species, on the contrary, are in most cases 
luimerously represented. Especially is this true of ^Ec/uniitn, of 
which there are at least two species, probably identical with the 
Eno-lish and Scandinavian ./s'. JmciiKi and 3J. cuspklata. Among 
the others we may mention Bri/rt'chia, Klordenia, BoJIlit (.?*), 
JIoore<(, Jii/flioci/pn's, etc., each with from one to four or more 
species, and most of them, if not all, with more or less obvicnis 
relations to "Wenlock species. But this l)ears upon a too impor- 
tant (piestion— /'. r., the correlation of American and European 
strata — to permit of definite assertions previous to much more 
careful and detailed c<3mparisons than I have yet found time to 
make. I am however now. through the kindness of Mr. G. K. 
Vine and Prof. T. Kupert Jones, fairly well equipped to enter 
upon such comparisons, and hope in the near future to undertake 
them. 
Beecherella, n. gen. 
Carapace small, elongate, boat-shaped to ovate, moderately 
convex, more or less ineciuivalve. Dorsal margin varying from 
nearly straight to strongly convex; back sometimes flattened, with 
a sharply defined carina on one or both valves, giving them a 
triangular shape in cross-sections; in other cases the dorsal slope 
is merely convex. Antero-dorsal extremity acuminate, often 
drawn out into a long spine; spine strongest on the right valve, 
sometimes absent entirely on the left valve. Posterior extremity 
