1892.] MICROSCOPICAL JOURNAL. 213 



enabled to collect in the Passaic river, about a mile from my house 

 in Newark, N. J., Homccocladia Jiliforjnis^ Schizoticvia 

 foetida {diverg-cns) , and Bacillaria paradoxa in plenty at all 

 seasons, except when frozen over. But then I had them living 

 in the house, unfrozen, in salt, brackish, and fresh water. Bacil- 

 laria paradoxa I had collected in East Newark (now called ILir- 

 rison),and in October, 1S76, in enormous quantities, I also 

 collected it at Fort Washington, on the Hudson river, on New 

 York Island, where the water is salt ; at High Bridge, New York 

 Island, where the water is also salt, and grew them in salt, brack- 

 ish, and fresh water. Thus I was enabled to study the Diatoms 

 living and in different densities of water. I made other collec- 

 tions and studied them in the same manner. I have now to record 

 the results. 



Hama'ocladia Jiliformis was founded by W. Smith in 1856 

 (Syn. Brit. Diat. vol. II., page So, pi. LV, 348), as " V. linear- 

 lanceolate, somewhat acute," and var. b., "a smaller form." I 

 have it from Newark, N. J., Sept., 1873, Sept., 1S74, Oct., 1876, 

 Aug., 1889, Sept.. 1889, and Aug., 1891 ; Jersey City, N. J., 

 July, 1S89, the Hackensack river, Sept., 18S9, a stream (fresh) 

 running down by Mt. Pleasant cemetery, Newark, N. J,, and in 

 the M. and E. canal (fresh water from Lake Hopatcong, N. J.), 

 Aug., 1890. Dr. Walker Arnott told me he had it from fresh 

 water in the Monkland canal near Glascow, Scotland, 165 feet 

 above the level of the sea. I now have it growing in fresh, brack- 

 ish, and salt water, W. Smith refers it to brackish water, and 

 gives but two localities, Bexhill in Sussex and near Lewis. So 

 it would seem to grow in fresh, brackish, and salt water, and 

 always in a frond or tube of hardened gelatinous matter. I have 

 it growing free without a frond or tube. 



Homoeocladia sig7noidea was founded by W. Smith in 1856 

 (Syn. Brit. Diat. vol. II, page 31, plate LV, fig. 349), as " F. 

 V. sigmoid ; v, linear, attenuated towards the extremities." 

 Always occurring in a frond or tube, growing in brackish water ; 

 and he gives but one locality, Wareham, Dorset. He says : "• The 

 species are all marine, and appear to be rare, as few British local- 

 ities are known to me, or have been given by the former authors," 

 showing that he collected but rarely and in a circumscribed local- 



Hotnceocladia Martiana was founded by C. A. Agardh in 

 1837, and he gives it as marine and Venice as the locality. It 

 had been described by C. A. Agardh as H. Martiana and H. 

 Anglica in 1830, and growing at Plymouth, England. W. 

 Smith says it is "a rare form," and gives Mr. Ralfs credit for 

 uniting the two species. 



In 1844 F. T. Kiitzing founded the genus Raphidoglcea^ and 

 gives four species, R. medusina^ from the Gulf of Naples, R. 

 tnanipulata^ from the Gulf of Genoa, R. interrupta^ from 

 Trieste, and R. micatzs (which is Ba7igia micans^ H. C. Lyng- 

 bye, 1819), from the Danish coast. 



