420 PROCEEDINGS OF THE ACADEMY OF 



tragidus differs from Leptomeryx iu the isolation of the first 

 premolar, as in the camels, and in the sectorial character of the 

 pennltimate premolar. The temporary premolars had the form 

 of the pennant corresponding teeth in Leptomeryx. 



Prof. Cope also mentioned two interesting observations on 

 Ungulate species of the Western Pliocene formation. lie found 

 that the horses of tlie genus Protohippus were provided with 

 three toes, as in Hippothei'ium ; skeletons of P. srjimctus, Cope, 

 and P. j^lacidus, Leidy, having furnished the parts in question. 



The other fact ascertained was the existence of a complete 

 series of superior incisor teeth in certain camels of the same period. 

 The observation was made on the cranium of an adult Procamelus 

 heterodontus, Cope, sp. nov. The alveoli were completely pre- 

 served, but it was thought that their appearance indicated the 

 easy shedding of the teeth. 



On Circulatory Movement in Vaucheria. Prof. Leidy made 

 some remarks on the intra-cellular circulation of plants, as exem- 

 plified in the hairs of the Mullein, the leaf-cells of Vallisneria, etc. 

 The moving streams of protoplasm he likened to ama?boid move- 

 ments, and expressed the opinion that they were of the same 

 character. In the common alga, Vaucheria, the filaments of which 

 consist of very long cells, comparable to those of Nitella or Chara, 

 he had observed an apparent motion of the cell contents, which 

 is somewhat peculiar and, at least, is not generally mentioned b}' 

 writers. The wall of the cells is invested on the interior with a 

 layer of tenacious protoplasm, containing the thinner liquid cell 

 contents as usual. The parietal protoplasm is closel^^ paved with 

 green granules, and these appear very slowly but incessantly' to 

 change their position in relation with one another. The motion is 

 so slow that it was a question for some time whether it did actually 

 occur, but it appears sufficiently obvious if observed in relation 

 with the lines of a micrometer, and its existence was confirmed by 

 several friends whose attention was directed to it. 



In behalf of the committee, Prof. Carson made the following 

 report: 



In accordance with the resolutions passed at the last meeting of 

 the Academy, upon the announcement by the chairman of the 

 death of Prof. Agassiz, that a committee be appointed to prepare 

 such a testimonial as would express the sentiment of the Academy 

 upon the loss of so distinguished a member, and be proper to be 

 placed upon the minutes as a record of the high appreciation en- 

 tertained by it of his services to science, the committee reports the 

 following : 



Resolved, That in the death of Professor Louis John Rudolph 

 Agassiz the Academy of Natural Sciences of Philadelphia has 

 lost one of the most illustrious of the associates whose names have 

 graced the list of members of the institution. 



