6io 



HISTORY OF PASADENA. 



B. FLUORESCENS LIQUEFACIENS 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^. 



I. Cylindrospermunt flexvostim. 2. Kostoc 7>iusco7um. 3. Cosmarium cordanum in process of divis- 

 ion. 4. Spirogyra adnata. 5, Zygnenta stelliurn. 6, Cladophora fracia. 7. Cocoueis pediciiliis on Clado- 

 phora. 8. Spores of Stigeoclonium fastigiaiiivi in various stag:es of divisioH. 9. Cymbella gasiroides. 

 10 Closterinm inoniliferiim. 11. -Cladopliot a oligoclona. 12. Pediashum boryantim. "13. Oscillaria anti- 

 liaria. 14. Tolypothrix distorta. All magnified 250 diameters. 



PHYCOPHYTA. 

 CLASS I. CHLOROPHYCE.^. 



Order Protococcoidece. 

 PROTOCOCCUS Ag. 



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

 SCENEDESMUS Meyen. 



S. DiMORPHfS Kuetz. Common in stagnant water. 



S. OBTusus Mey. In aquarium in laboratory. 



S. ACUTus Mey. Frequent in stagnant water. 



