1883. 147 Trans. N. V. Ac. Set. 



dentition consisted of many pairs of plates, constituting a tesselatecl 

 pavennent. 



Like those of the associated species, the remains of this very re- 

 marRable fish are part of the fruit of the enthusiasm and indefatigable 

 industry of Mr. Jay Terrell of Oberlin, Ohio, the discoverer of the great 

 species of Dmtchthys which bears his name, the only remains known 

 of Diplognathus and various other interesting ichthyic fossils. 



MYLOSTOMA TERRELLI, n. sp. 



Inferior palatal teeth in pairs, each of which is spatulate in outline, 

 with one margin nearly straight, the other strongly arched toward 

 the exterior ; length, 6 to 7 inches, by \% inches in greatest breadth ; 

 crown composed of dense enamel-like tissue, 8 lines in thickness 

 toward the front, and gradually thinning toward the narrowed 

 posterior end. Triturating surface punctate or vermicularly roughened 

 slightly arched from front to rear, and rising into a low rounded boss 

 near the external margin, where the tooth is broadest, and about one- 

 third of the length from the anterior extremity. Below, the croyvn is 

 supported by a strong bony keel which begins at the anterior fourth 

 of the length and gradually descends backward until it has a width of 

 lYz inches, terminating in a thin irregularly rounded margin, 10 inches 

 or more from the anterior extremity of the crown. 



With all the other specimens of the genus, these teeth were dis- 

 covered, by Mr. Jay Terrell in the Huron shale on the banks of Ver- 

 mi ion River, Ohio. 



May 14, 1883. 



The President, Dr. J. S. Newberry, in the Chair. 



Thirty-six persons present. 



Mr. G. F. KuNz exhibited a specimen of graphite, containing 

 apparently over twenty per cent, of carbon, from a vein at Bloom- 

 field, Morris county. New Jersey. The vein has been traced for 

 a distance of four or five miles, and contains, in association with 

 the graphite, pyrrhotite, apatite, loxoclase feldspar, and muscovite. 

 A shaft was sunk upon it twenty years ago, but mining operations 

 have been recently resumed at this locality, with promise of 

 success. 



Dr. Alexis A. Julien read a paper, by Dr. H. Carrington 

 Bolton and himself, on 



THE SINGING BEACH OF MANCHESTER, MASS. 



The paper was illustrated by a series of specimens of beach 

 sands, from many American and foreign localities, some with the 



