144 The America/n Geologist. Feb. isoi 
all fossil ichthyologists. His gigantic Titanichthys and many 
other specimens from northern Ohio enrich the collection of Dr. 
Newberry at Columbia College, New York. 
Dr. Clark has now an entire specimen of Cladodus resembling 
the one described. It is nearly six feet long and almost complete. 
From tip to tip of the expanded fin is a distance of twent}*-one 
inches. The teeth are shown in a row but are not yet freed from 
the matrix. The fins are not set at the same angle to the bod}- as 
in the specimen figured by Newberry as < Jladodus kepleri. Each 
measures nine and a half by six and a half inches. It also differs 
from that species in the form of the head, teeth, fins and jaw, and 
he claims it as a new species. 
Another specimen so far as it is at present discernible indicates 
a new genus. The head is remarkably round, measuring five by 
four and a half inches, and there is a constriction between it and 
the body. Its length over all is about twenty-six and a quarter 
inches. 
A remarkable mandible of Titanichthys, straighter than any 
previously found, and twenty-three inches long by three and three- 
quarters inches deep, is another interesting object in the collection 
as indicating a new species of the genus. 
He has also extracted from the matrix and put together with 
much skill a perfect jaw of Dinichthys, only ten inches long by 
one and one-eighth deep, and differing from am T yet known in its 
exceedingly slender proportions and different structure. The cut- 
ting edge of the dentary bone terminates in a thin tooth strongly 
contrasting with the massive ending of the species previously 
described. 
But probably the most interesting of all Dr. Clark's recent 
discoveries, is a plate of an armor-clad fish from the Cleveland 
shale, resembling nothing yet described but recalling to some 
degree the general likeness of Glyptaspis as figured \>y Newberiy 
in his late volume on palaeozoic fishes. But instead of being 
thick and overlapping, this plate is thin and shows no bevelled 
edges. The sculpture is also very fine and delicate. It measures 
eleven and a half by five inches. 
Dr. Clark has also the head of a Titanichthys that promises to 
furnish some new information on the structure of the heads of our 
placoderm fishes, and which he promises soon to make public. 
He thinks that the classification of some of the fishes of the 
Cleveland shale is to say the leasl a little lL mixed," and that from 
the material in his possession and his explanation of the same he 
will be able to establish his views. 
The Message ok Gov. Francis, of Missouri, commends the 
geological survey of that state in its plan and progress, and asks 
the Legislature to make increased appropriation for its support 
and continuance. 
