ANTARCTIC BRYOZOA — ROGICK 227 



a large starfish. All three stations were from Marguerite Bay, an 

 inlet of Antarctica on the west coast of Palmer Peninsula in the South 

 Pacific between Adelaide and Alexander I Islands, lat. G8°30' S., 

 long. 68°30' W. The amount of material collected at Station 190 

 was a half-pint jar containing about 33 different bryozoan species; 

 the amount from Station 234 was a pint jar containing about 24 

 bryozoan species. Some of the Barentsia specimens from Station 190 

 grew on a bryozoan, Phylactella lyrulata Calvet 1909, and some of those 

 from Station 234 grew on hydroid stems and rootlet fibers of a bryo- 

 zoan, Cellarinella. The total amount of Barentsia isolated from these 

 collections amounted to only a small vial. 



Barentsia discreta presents a most interesting worldwide distribu- 

 tion (pi. 2). It has been reported from Tropical, Temperate and 

 Frigid Zone waters, with the largest specimens coming from the colder 

 waters. It grows in such diverse places as the North and South 

 Atlantic, North and South Pacific, Arctic and Indian Oceans; the 

 Mediterranean, South China, Caribbean, Java, and Ceram Seas ; and the 

 Gulf of Mexico, Long Island Sound, and Chesapeake Bay. Citations 

 are given in the explanation of plate 2. 



The quantity of material collected from most stations was rather 

 small, except at San Pedro, Calif., where Robertson found it to be 

 abundant. 



The depths at which it has been reported range from to 164 

 fathoms or from to about 300 meters. 



The substrates on which it grows also are diverse: the plants 

 Caulerpa (Ehlers, 1890, p. 143) and Posidonia cavolini (Zirpolo, 1927, 

 p. 413); the hydroid Sertularia (Thornely, 1924, p. 20); the gastropod 

 Priene cancellata (Waters, 1904, p. 100); the parchment tubes of 

 Chetopterus (annehd) (JulUen, 1888, p. 14); the bryozoans Adeonella, 

 Lepralia celleporoides, Retepora (Harmer, 1915, p. 30), Amathia alter- 

 nata (Osburn, 1932, p. 442), Bowerbankia (JuUien, 1888, p. 14) 

 Menipea (Thornely, 1924, p. 20), and on the Cellarinella and Phylac- 

 tella lyrulata of the present study. Marcus has recorded it from 

 unidentified algae, corals, hydroids, bryozoans, shells, tunicates, and 

 stones. The species seems to adapt itself readily to various substrates 

 and because of its wide distribution should make an excellent form 

 for experimentation. 



