May, I860.] elliott society. 23 



In regard to the yoiing Hirudinem exhibited this evening, Prof. McCrady 

 stated that the bright yellow organs seen through their traiLSparent bodies were 

 the digestive cavity and its appendages, with their lining of peculiar cells. 

 Two of these appendages, larger than the rest, were given off as diverticnla 

 directed posteriorly, one on each side of the median Hne, and irresLstably re- 

 mhided one of the two blind diverticula in the same situation in Distomatn and 

 similar organs in some Planarians. He had himself no donbt of the pro^jriety 

 of uniting the Hirudinem and Distomata in one group. 



Members Elected. 

 Julian Mitchell, Esq. Dr. P. Geeyais Eobinson. 



MAT 1st, 18G0. 



Vice-President W. Weagg Smith in tlie Cliair. 

 Contrilnitions to the Lilwary. 



First Eeport of tlie Geolooical and AgTi cultural Survey of Texas, 

 with an Address by B. F. Sliumard, State Geolo<^ist. 



Proceedings of the Academy of Natural Sciences of Philadelphia, 

 January, 18G0, pages 1-48. 



JDoncttiwis to tlie Collection. 



Branch of fhinijjeo^iis Virginiamis, covered with a fungus, and 

 Nest containing egg-s of an unkno^^vn bird. Presented by Prof. 

 J. McCrady. 



The Leech was again exhibited with its young, showing the 

 progTess of their development. 



Prof. McCrady read a Review of Darwin's work on the "Origin 

 of Species." 



