38 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



ascopore is situated a short distance proximal to the peristome. There are 

 no avicularia and the ovicell is merely an expansion of the peristome. 



This is a very widely distributed species, but apparently is not abund- 

 ant on the American side of the Atlantic. Osburn found it at the Tor- 

 tugas Islands, Florida, and off Guanica Harbor, Porto Rico, and Canu 

 and Bassler recorded it from Fowey Light, southern Florida. 



Distribution.— Stations At529, 12° 09' 30'' N, 70° 31' 00" W at 



39 fms, and At530, 12° 11' 45" N, 70° 45' 15" W at 30 fms. 



Family Adeonidae Jullien 1903 

 Genus ADEONA Lamouroux 1816 

 Adeona violacea (Johnston), 1847 



Smitt 1873: 30 (Porina violacea and P. plagiopora). Osburn 1914: 199; 

 1940: 445. Canu and Bassler 1928: 126 (A. plagiopora). 



In 1914 Osburn called attention to the intergradation of plagiopora 

 with violacea. Since that time Hastings (1930: 728) has placed them in 

 synonymy and Marcus (1939: 147) has given an extended synonymy 

 locating plagiopora under violacea. 



The species has a very wide distribution. Smitt and Osburn have 

 listed it for the Tortugas Islands, Florida, and Osburn for Porto Rico. 

 Canu and Bassler recorded it for the Gulf of Mexico, the Florida 

 Straits and north of Cuba. 



Distribution. — Stations A30-39, A42-39, At505, and At513. These 

 stations place the locations at Cubagua, Aruba, and Margarita Islands, 

 at shore to 23 fms. 



Genus BRACEBRIDGIA MacGillivray 1886 

 Bracebridgia subsulcata (Smitt), 1873 



Smitt 1873:28 (Porina). Osburn 1914:199; 1940:446. Canu and 

 Bassler 1928: 127. 



This species appears to be known only from the West Indian region. 

 Smitt recorded it from the Florida Straits, Osburn from the Tortugas 

 Islands and Porto Rico, and Canu and Bassler from Miami, Florida, 

 and the Gulf of Mexico. 



Distribution. — Stations A14-39 and At503, 1 mile SW of Cape la 

 Vela, Colombia at 10 to 22 fms, and At529, 12° 09' 30" N, 70° 31' 00" 

 W at 39 fms. 



