168 
KoRMAN^ on Diatomacece, 
Rhizosolenia^ Ehrenberg. 
R. styliformisj Brightwell. — Very abundant in Ascidian 
gatherings. 
R. robusta, Nor. M. S. — Not unfreqnent in Ascidians. 
R. imbricata, Brigbtw. — Frequent in Ascidians, 
R. alata, Brightw. — Very frequent in Ascidians. 
R. setigera, Brightw. — Not uncommon with the above. 
R. Calcar-avis, Schultz. — Bare. In an Ascidian. 
Syndendrium, Ehrenberg. 
R. diadema, Ehr. — Rare. In Ascidians. 
DiCLADiA, Ehrenberg. 
D. capreoliSy Ehr. — Rare. In Ascidians. 
Ch(etoceras_, Ehrenberg. 
C. Wighamiij Brightw. — Frequent in Ascidians. 
C. bacillaria, Bailey. — Not unfrequent in Ascidians. 
C. boreale, Bailey. — Frequent in Ascidians. 
C. Peruvianum, Brightw. — Rare. In Ascidians. 
Bacteriastrum, Ehrenberg. 
B. furcatum. — Frequent in Ascidians,. 
