402 PROCEEDINGS OF THE ACADEMY OF [1893. 



differs from those already known in the shortness of the dorsal fin, 

 etc. The characters of the species so far as determinable are as 



follows : 



Amyzon brevipinne sp. nov. — Form, medium ; depth of body 

 equal length of head. Fin radii ; D. 22-3 ; A. 8 ; V. probably 11, 

 an interruption in the order of the rays making the location of these 

 rays uncertain. Seventeen vertebrae may he counted anterior to the 

 caudal region, of which 10 are anterior to the anterior hase of the 

 dorsal fin. Space for two additional vertebrae exists at an interrup- 

 tion of the dorsal series, so that the total number of precaudal ver- 

 tebras is probably nineteen, as the dorsal fin is uninterrupted. 

 Distal caudal vertebra' and tin absent. Pectoral, ventral and ana! 

 fins well separated from each other. Length anterior to caudal 

 vertebne .17 mm.; length of base of dorsal fin, 23*5 mm.; depth at 

 anterior base of dorsal fin, 2") nun. The species differs from those 

 already described in the smaller number of dorsal fin-rays, and of 

 dorsal vertebne. The specimen on which it is based is of smaller 

 size than those of most of the other species, but some of the frag- 

 ments of the collection indicate larger individuals. 



The discovery of this species, extends the distribution of the 

 Amyzon beds beyond its previous limits. The localities at present 

 known are the South Park, Colorado, and Osino, Elko Co., Nevada. 

 Dr. Dawson informs me that both insect and plant remains occur in 

 these fish-shales and that Prof. Scudder finds the former to belong- 

 to species different from those of other localities. 



November 28. 



The President, General Isaac J. Wistar, in the chair. 

 Forty-seven persons present. 



Papers under the following titles were presented for publication: — 

 "North American Larridae," by Wm. J. Fox. 



"New Species of Fungi from various localities," by J. B. Ellis and 

 B. M. Everhart. 



"Critical List of Mollusks collected in the Potomac Valley," by 

 H. A. Pilsbry. 



The Committee on the Hayden Memorial Geological Award 

 reported that the medal and the interest arising from the fund had 

 been this year voted to Thomas Henry Huxley, L. L. D., F. R. S., 

 Professor of Biology in the Royal College of Science of London. 



