91 



lashing movement of the long lash like filaments arranged 

 in a circle between the shell and the month. 



In a general way, the segmentation of the egg of the 

 clam appears to resemble, in its early stages, at least, the 

 same process in Anodonta^ as described by Flemming.* 

 The conclusion that the clam is exactly parallel to Ano- 

 donta in its development is not, however, warranted for 

 this reason, and to clear up the questions raised here, we 

 must await the results of another season's work. 



*Studien in der Entwickelungsgeschichte der Najaden. Sitzb. de k. Akad. der Wissensch.,LXXI» 

 Bd., I and II Hft., p. 8i. Vienna, 1875. 



