THALASSIONEMA. 



3*9 



Thalassionema Grun. (in H.V.H.'s Atl.) 



In my Atlas, pi. 43, fig. 7-10, Mr. Grunow has proposed to raise Synedra 

 Nitzschioides to the rank of a genus. I have preferred to preserve this form 



Fig. 75. Thalassionema Nitzschiodes, 



(as I have done in the Text of the Synopsis) among the Synedra with which I 

 arranged it in the first instance. 



