Geology and Natural History. 311 
nearly all my views as to the characters and affinities of the Dino- 
cerata, as well as most of my corrections of his errors, although 
without giving ne in either case. Unfortunately, he still mis- 
the moreover, new errors ae “be. mira a few only of 
which can be corrected here for want of s 
Ist. Prof. Cope is wrong in assigning vat three sacral vertebrae 
to the Dinocerata, as Dinoceras, the type of the group, aap 
has four, and the other r genera probably as many. 2d. The neck 
in Tinoceras grandis Marsh (or ? Tinoceras cornutus) was much 
Yale Museum clearly, prove. 3d. Prof. ope is entirely in error 
The specimen described as ; lations cornutus Was fully adult, as 
the teeth show, and the ser aa between it and the type of 
Vinoceras grandis may be due to age, 5th. The nasal bones in 
this une s do not form the inner half of the middle horn-cores, but 
only a small portion of the base, the cores being essentially on the 
mazillaries, 6th. The anterior extension of the malar bone is not 
in Dinoceras much less than in the perissodactyls. 7th. The tusks 
all different from those now claimed. good ast of the in- 
accuracy which seems inseparable from Prof. Cope’s work is seen 
in the explanation of the plates of this paper, where two serious 
mistakes occur in the first line. 
Prof. Cope concludes with some remarks cae paren be 
epi ated by inion, Hie «i views as to what conatitates y publication 
Prot eco directed attention to some 'ioociles part ar a sind 
collection recently received. They were found a in blue 
clay containing an abundance of fossil diatomes, am 
Coscinodiseus is especially conspicuous. The fossil rein te re- 
mains consist mainly of yertebre and teeth of cetaceans, vertebre 
of bony fishes, teeth of sharks, and spines of rays. Among chat 
