19 



exposed places it is only gathered in deeper water about 12 

 meters. 



It has been found, St. Croix: Christianssted's Harbour and Christi- 

 anssted's Lagoon, Lt. Princess, off Frederikssted, White Bay, Lime Tree 

 Bay; St. Thomas: Bovoni Lagoon. 



Geogr. Distrib. West Indies, Florida, Mexico. 



6. Chsetomorpha gracilis Kiitz. 



KuTziNG, Phycologia germanica, p. 203; Species Algarum, p. 276; 

 Tabulee phycoL, vol. 3, pi. 52, fig. 1. Hauck, Meeresalgen, p. 440. Reinke, 

 Algenflora der westl. Ostsee deutschen Antheils, p. 84. 



To this species of Kijtzing I have referred a form with 

 filaments 40—70 n thick and the length of its cells from twice 

 to four times the diameter. 



Found intermingled among other alga3 from the reef connecting St. 

 Thomas with the Hurricane Island. 



Geogr. Distrib. Mediterranean, France, Singapore. 



Rhizoclonium Kiitz. 



1. Rhizoclonium Kochianum Kiitz. 



KuTziNG, Phycologia germanica, 1845, p. 206. Stockmayer, Ueber 

 die Algengattung Rhizoclonium (Verhandl. d. zool. — bot. Gesellsch. in Wien, 

 40, 1890, p. 582). Vickers, Phycologia Barbadensis, 1904, 

 p. 18, pi. XL 



The specimens found vary rather considerably; 

 in some the fdaments are about 12 — 14 /« thick and 

 1 — 2 diam. long. Other specimens had fdaments 

 about 16 /-i thick sometimes even reaching 25 />«, the 

 cells being nearly twice the diameter. In one collec- 

 tion from St. Thomas the fdaments were about 14 n 

 thick and 1^ — 3 diam. long; and rather near to 

 these specimens were also some in a collection from 

 St. Jan, in which the fdaments were about 13 ^ 

 thick and 1 1/^ — 3 diam. long (Fig. 7); in specimens 

 from Frederikssted the cells were about I'd fj. thick. 



This species is found entangled among other 

 algse e. g. Cladophora crispiila, Falkenhergia etc. and 

 occurs both in shallow water and down to a depth 

 of about 12 meters. 



It is found St. Croix: Salt River, Long Reef, off Frederikssted; 

 St. Thomas: Store Nordside Bugt; St. Jan: Cruz Bay. 



Geogr. Distrib. West Indies, Europe. 



2* 



Fig. 7. 



Rhizoclonium 



Kochianum 



Kiitz. 



Part of a 



filament. 



About 75:3. 



