189 



cariosus, having the posterior portion of them charged witfi eggs, 

 while the whole length of the hranchiie had oviducts charged in the 

 other two, the Anodonta fiumatilis and Anoclonta undvlata. In the 

 text, I stated that in species having certain distinctions, "the oviducts 

 will be found to be placed in i\\e posterior portion of the branchiae. " 



In regard to the Anodontce, I stated that they were not, like the 

 Uniones, figured, with the posterior portion of the branchise charged 

 with eggs, but that they presented "an even mass from the anterior 

 to the posterior part." Mentioning some specimens of Anodonta Fe- 

 russaciana being examined, I stated that "the whole lobe of the su- 

 perior branchice''' were found "charged with ova." The period of 

 gestation was considered by me as very important, and many obser- 

 vations were made, which may be found in my papers, particularly 

 in those of July 15, 1836, and February 19, 1841. 



Prof. Agassiz announces that "the Unio gracilis and Uniofragilis, 

 usually considered separate species," are not distinct. I pointed this 

 out in xnj synopsis, in June, 1838, in Vol. VI. of Transactions, new 

 series, page 121. 



Prof. Agassiz must have overlooked these observations published 

 so long since, but I deem it due to myself to make this reclamation.* 



Pending nominations, from Nos. 242 to 248, and new nomi- 

 nations, from Nos, 250 to 255, were read. 



The Clerk read the proceedings of a special meeting of the 

 Officers and Council held on the 14th inst. 



In accordance with the resolution of the Officers and Coun- 

 cil, an amendment of the By-laws was proposed. 



-■^ It is only due to Poll and to Pfeiffer, to say that they had both observed 

 and figured the muscles of the foot under the tex'ni of the "muscles of the 

 stomach." "When I wrote my early papers, where the anatomy and physio- 

 logy of the NaYades were partially given, I was not acquainted with the ex- 

 cellent works of these able and distinguished zoologists. I believe that no- 

 copy of their works had then reached this country. The great work of 

 Poll is perhaps unequalled in its accuracy and magnificence. 



