60 



Eastman, in which the anterior median is well preserved by 

 itself: 3d, the small specimen of Dinichthys minor (/) dis- 

 covered by Mr. Mixer, near Buffalo, N. Y., and to be de- 

 scribed by Dr. C. R. Eastman, in which all of the ventral 

 pTates are tolerably well preserved in their natural position, 

 and in which there is apparently a distinct sutui'e and over- 

 japping between an anterior and a posterior median; the 

 plates, however, are very thin; and 4th, the immense Din- 

 icJithys at the State University at Columbus, O., figured 

 doubtfully as a litanichthys by Dr. Claypole in Vol. Vll of 

 the Geology of Ohio, in which the posterior median is well 

 preserved, including a distinct, natural socket at the anterior 

 end for the reception of the hinder end of the anterior plate. 

 This is the most decisive case knov\ n, and with the others, 

 inclines the author to the opinion that there were two medians, 

 an anterior and a posterior. Still we lack a single complete 

 specimen, in which both the medians are distinctly shown. 

 The paper was illustrated by drawings. It may be pub- 

 lished in full in the American Geologist. 



OHIO BOULDERS CONTAINING "HURONITE." 



A. A. WRIGHT. 



Reference was made to a paper by Mr. A. E. Barlow, of 

 the Canadian Survey, upon "Some Dykes Containing 

 'Huronite,' " presented at the Baltimore meeting of the 

 Geological Society and published in the Ottawa Naturalist, 

 Vol. IX. Specimens of these dark green diabases, contain- 

 ing large, light yellow blotches of "Huronite" were exhi- 

 bited and reported as boulders from Oberlin, Columbus and 

 elsewhere. "Huronite" is now known to be a saussuritized 

 labradorite. Each blotch consists of a single phenocryst. 



