NO. 5 OSBURN : BRYOZOA 9 



Division 2, IMalacostega Levinsen 1909 



Family Membraniporidae Busk 1854 



Genus MEMBRANIPORA Blainville 1830 



Membranipora tuberculata (Bosc), 1802 



Osburn 1914:193 (M. tehuelcha); 1927:124 (Nichtina); 1940:349. 



Canu and Bassler 1928: 18 (Nitscheina). 



A circumtropical species encrusting algae along shore and on Sar- 

 gassum wherever this "gulf weed" may happen to float. Osburn has noted 

 its presence at the Tortugas Islands, Florida, and Curagao Island and 

 Porto Rico ; Canu and Bassler record it from the Straits of Florida. 



Distribution. — Station A22-39. Tortuga Island, Venezuela at 2 to 5 

 fms, on attached algae. 



Genus AGANTHODESIA Canu and Bassler 1920 

 Acanthodesia savarti (Audouin), 1826 

 Smitt 1873:20 (Biflustra). Osburn 1914: 194 (Membranipora); 1940: 

 352. Canu and Bassler 1928: 14. 



Widely distributed in all warmer oceans. Smitt listed it from Florida ; 

 Osburn from the Tortugas Islands, Florida, and Porto Rico, and Canu 

 and Bassler from the Gulf of Mexico. 



Distribution.— ^tmons A32-39, A42-39, At505, At517, and At529 

 These stations place the locations at Coche, Margarita, and Aruba 

 Islands and the Gulf of Venezuela at 18 to 33 fms. 



Acanthodesia tenuis (Desor) 1848 

 Smitt 1873- : 19 (Biflustra denticula, non Busk). Canu and Bassler 

 1928:62 (Hemiseptella denticulata) and p. 63 (H. hexagonalis). Osburn 

 1940:353. 



A very abundant species along the east coast of the United States 

 from Cape Cod southward and south to Brazil (Marcus 1937:42); 

 Denmark; Mediterranean Sea and the v/est coast of Africa. It is a 

 variable species, differing with the amount of salinity, depth and the 

 nature of the substratum, and has been described under several names. 

 Marcus (1937: 42) and Osburn (1940: 353) both discuss the variations 

 and synonymy. 



Distribution.— ?>tzt\om A15-39, A32-39, A33-39, A48-39, At505, 

 and At531. These stations place the locations at Bahia Honda and 

 Galera Point Light, Colombia; Coche and Aruba Islands, and the 

 Gulf of Venezuela at 10 to 33 fms. 



