1875.] 193 [Brooks. 



caused fractures in many of them. Sections still further south illus- 

 trate the greater pressure and consequent larger irregularities in posi- 

 tion with similar overturns. Prof. Hitchcock thought this theory of 

 origin and method of disturbance, though involving numerous frac- 

 tures, would enable geologists to understand perfectly the structure of 

 the whole ground covered in the Taconic controversy. 



In conclusion, the speaker remarked that these views would confirm 

 the sections he had drawn across the Green Mountains, giving tc* 

 that range an anticlinal form, whether exhibited naturally or in- 

 verted. 



The Vice President announced that Prof. James Orton 

 proposed to make a third South American exploration, and 

 had selected the Rio Beni, as promising results of the great- 

 est importance. It was voted that the chair appoint a com- 

 mittee of three to prepare a proper expression of the Socie- 

 ty's interest in the proposed survey ; and Messrs. Kiles,. 

 Kneeland and Burgess were accordingly appointed. 



November 17, 1375. 



The President, Mr. T. T. Bouve, in the chair. Fifty-nine 

 persons present. 



The following paper was read : — 



Embryology of Salpa. By W. K. Brooks, Ph.D. 



Students of the embryology of the various forms of Tunicata are 

 so numerous and active at present, that the naturalist who refrains 

 from publishing any new facts which he may acquire until the fig- 

 ures necessary for their illustration can be prepared, is very apt 

 to find that they are no longer new. The following brief abstract 

 of the more important points in the history of the development of 

 Salpa has therefore been drawn up and presented to the Society, as 

 the precursor of a more extended description which is now in prep- 

 aration. 



At the time when the Salpa-chain escapes from the body of the 

 solitary form, each individual of the chain contains one ovum, which 



PROCEEDINGS B. S. N. H. — VOL. XVIII. 13 FEBRUARY, 1876. 



