328 PROCEEDINGS OE THE ACADEMY OF 



With this species we close the Catalogue of the present very interesting collec- 

 tion. In that part of Commodore Rodger's Report relating to natural history, 

 we hope to give figures of the most remarkable species, as well as further 

 notes on their manners and habits, by the naturalists who accompanied the 

 expedition. 



July 1st, 1862. 

 Dr. Bridges, Vice-President, iu the Chair. 

 Fifteen members present. 



July Sth, 1862. 

 Dr. Bridges, Vice-President, in the Chair. 

 Thirteen members present. 



July 15th, 1862. 

 Dr. Bridges, Vice-President, in the Chair. 

 Nine members present. 



July 22d, 1862. 

 Dr. Coates in the Chair. 



Six members present. 



The following papers were presented for publication, and referred to 

 Committees : 



Notes on the family of Scombroids. By Theo. Grill. 



Notes on the genera of Fishes of Western North America. By Theo. 

 Gill. 



July 29th, 1862. 



Dr. Bridges, Vice-President, in the Chair. 



Thirteen members present. 



On report of the respective Committees, the following papers were 

 ordered to be published in the Proceedings : 



Note on the Family of SCOMBROIDS. 



BY THEODORE GILL. 



Incited by the discovery of the existence of radiating spines at the angle of 

 the preoperculum as a characteristic feature of the youth of the Carangoids, 

 I turned my attention to the family of Scombroids, and have ascertained that 

 the same feature exists in that family. The Scombroids, then, in extreme 

 youth, have the preoperculum armed with three spines, above and below which are 

 generally smaller ones, all of which are afterwards absorbed in the substance of 

 the bone. I have myself verified this law on the young of a new species of 

 Sarda, of which a single specimen, about an inch and five-eighths in length, 



[July, 



