111 Morgan Expeditions. 
been found in the shale, in which the only recognizable forms 
are the very abundant Déiscina and two species of Lingula, 
already described. 
By reference to the paper on the Brachiopoda of Ereré, 
mentioned above, it will be seen that many of the forms 
there described are identical with species of the Devonian 
age, more especially the Hamilton group, of New York 
state, and that most of the remaining forms have closely 
related ones in these same deposits of North America. The 
close relation in horizon of the middle Devonian of New 
York and the formations of the plain of Ereré was thus 
demonstrated. The study of the mollusks has greatly 
strengthened the proof of this relationship, for several of 
the forms of mollusks from Ereré have proved identical with 
forms recently described from the Hamilton group of New 
York by Prof. Hall, and possibly others, now apparently 
distinct, may also turn out identical with more extended col- 
lections. All the genera represented, with a single excep- 
tion, are common to the Devonian elsewhere. We are under 
very many obligations to Prof. James Hall of Albany, N. Y., 
for identifying for us many of the following genera, some 
of which have been recently proposed by him. He also 
made 2 comparison of the species with the New York forms 
contained in his collection, and it was with his aid that we 
were enabled to unite the three forms, as hereinafter indi- 
-cated. To Mr. R. P. Whitfield, of Albany, we are also 
much indebted for assistance in our work. 
TRILOBIDRES. 
Genus DALMANIA, Emmrich. 
Dalmania Paituna, sp. nov. 
Animal of medium size, sometimes quite large: test very tumid, and 
with the different lobes and segments sharply defined. 
Buckler crescent-shaped; greatest breadth about one and one-fourth 
the greatest length, and nearly twice the length of the glabella; in front 
sub-acuminate or bluntly sub-angular, the margins on cither side diverg- 
