6io 



HISTORY OF PASADENA. 



B. FLUORESCENS LiouEFACiENS Fluegge. Common in water. 



B. TERMO (Muell.) Cohn. Common in various decaying substances. 



B. VULGARIS Haus. In decaying meat. 



SPIRILLUM Ehrb. 



S. RUGULA (Muell.) Ehr. Common in decaying substances. 



FRESH-WATER ALG/E. 



I. Cylindrospermum flexuosum. 2. I^'ostoc musconnn. 3. Cosma?tiem rordan7im in process of divis- 

 ion. 4. Spirogyra adnata. 5, Zygnema stelHicm. 6. Cladophora fracla . 7. Coconeis pedictilus ou Clado- 

 phora. 8. Spores of Stigeoclonium fastigiatum in various stages of germination Cymbella gastroides. 

 10. Closterium moniliferum. 11. Cladophora oligoclona. 12. Pediasttum boryaniun. 13. Oscillaria anti- 

 liaria. 14. Tolypothnx disioria. All magnified 250 diameters. 



PHYCOPHYTA. 

 CLASS I. CHLOROPHYCE^E. 



Order Protococcoidece. 

 PROTOCOCCUS Ag. 



P. viRiDis Ag. Very common in water and on wet surfaces. 

 SCENEDESMUS Meyeu. 



S. DiMORPHUS Kuetz. Common in stagnant water. 



S. OBTUsrs Mey. In aquarium in laboratory. 



S. ACUTUS Mey. Frequent in stagnant water. 



