ALG^. 107 



diatoms in a hot spring in Pueblo Valley, Nevada, 

 the temperature of which was 163° Fahr. More than 

 fifty different species were recognized by him, and 

 they were found to be mostly identical with the 

 species found in the beds of infusorial earth in Utah, 

 described by Ehrenberg, showing that the latter 

 must have been accumulated in a hot lake, of about 

 the same temperature. No other living species were 

 found in the hot waters, excepting red algse. 



In one of the hot springs at the California geysers, 

 having a temperature of 198" Fahr., he found two 

 kinds of conferva;. In another spring, with the 

 temperature at 174° Fahr., many OscillaricB were 

 found, which, by the interlacing of their fibres, formed 

 a semi-gelatinous mass ; and in the water of a creek, 

 at a lower temperature, the algae formed layers some- 

 times three inches thick, covering the bottom of the 

 pools, mixed with the same diatoms as were found 

 in the 174° spring.^ 



The Challejiger expedition obtained algs; from the 

 boiling and hot springs in the Azores, amongst which 

 Botryococcus Bratmii was one of the most common 

 forms, mingled with some Chroococcns and species of 

 Oscillaria. Dr. Hooker found two species of Con- 

 fervcR at the hot springs of Belcuppce, in the Behar 

 hills, in broad luxuriant strata, wherever the tempera- 

 ture was cooled down to \6'^° Fahr. 



ACTINOPHRYS. 

 Some remarkable phenomena were described by 



' Annals of Natural History, October, 1872, p. 312. 



