74 THE AMERICAN MONTHLY [Mar., 



lied Snow within the ten-itories of the! United States. 



Prof. Brewer informed me that he found Red Snow 

 commonly on the perpetual snows of the Sierra Nevada. 

 For many years before this I had seen this remarkable 

 appearance, not however, upon snow, but upon the sur- 

 face of water of ditches and marshes all around New York, 

 This investigation has been treated of in a note on Col- 

 ored Rain by the present writer in the proceedings of the 

 New York Lyceum of Natural History, Vol. 1, page 272, 

 October 23, 1871. I do not think the Red Snow occurs 

 in a equable climate like that of San Francisco, or in tlie 

 hot sun of New York, nor do I know of its occuring in 

 the hotter climates of the South. 



Diatoms of the Connecticut Shore. — VI. 



By Wm. a. terry, 

 bhistol, conn. 



In a former article of this series, October 1892, describ- 

 ing the diatoms of the Quinnipiac marshes, I mentioned 

 a Pleiirosigvia which resembled closely Colletonema ex- 

 itniuni: but which did not appear to be a CoUetontma 

 when I found it, but was an independent and rapid trav- 

 eller like other Pleurosigma. The same form was abun- 

 dant in the fossil deposit taken from Davis' pit, and the 

 living specimens were found in ditches and pond holes 

 in the adjoining marsh. They were very plentiful in the 

 gathering and very active, perhaps more so than othm- 

 kinds witli them which were mostly Namcula. 



With the material sent to M. Tempere from Davis" pit, 

 I sent also a slide of these diatoms and called his atten- 

 tion to them. He replied that they were Colletonema 

 exinilani. In " Le Diato/nlste '" for December 1893, is an 

 illustration of what appears to be the same diatom, Plate 

 III, Fig 3. Prof. Cleve calls it " Gyrosigma temperei, 

 (yl. n. sp, " and says; "Valve linear straight, rounded 



