64 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



1913. Steganoporella magnilabris Waters, Bryozoa from Zanzibar, Proceedings Zoological Society, 



London, p. 498, pi. 72, iigs. 12-20 (cites bibliography). 



1914. Steganoporella magnilabris Osburn, The bryozoa of the Tortugas Islands, Florida, Publi- 



cation Carnegie Institute, Washington, No. 182, p. 196. 



Measurements. — Apertura of small (a) zooecia. .1 , « ,^ 



^ ta = 0.40 mm. 



Zooecia (a). 



Lz = 0.46-0.48 mm. 

 fe = 0.42-0.46 mm. 



. , ,, ,„, . fi^a = 0.46-0.48 mm. 



Apertura 01 large (-d) zooecia. . , ^ ,r. r> </- 

 ^ 6 V / Za = 0.42-0.46 mm. 



Zooecia (B) . 



\Lz = 1.20 mm. 

 " 1 fe = 0.60 mm. 



The zoaria are bilamellar; the two lamellae are easily separated. The micro- 

 metric measurements given by Harmer are quite variable; ours are more constant 

 and always greater than those in Steganoporella parvicella. 



Occurrence. — Miocene (Choctawhatchee marl) : Jackson Bluff, Ocklocknee 

 River, 25 miles southwest of Tallahassee, Florida (very rare). Pliocene (Caloosa- 

 hatchee marl) ; Monroe County, Florida (very rare) . 



Habitat. — Western Atlantic: Off Florida (24-59 meters), Jamaica (16-19 

 meters), St. Vincent, Brazil (32 meters). Western Pacific: Oft' Japan (324 meters), 

 China Sea (43 meters), Philippines (29 meters), Singapore to Honolulu (32-64 

 meters), Queensland (19-32 meters). Indian Ocean: Trincomalie, Admirality 

 Islands (32-40 meters). East Africa (3-16 meters). 



Plesiotypes.— Cat. No. 68487, U.S.N.M. 



Family ASPIDOSTOMIDAE Canu, 1908. 

 Genus ODONTIONELLA Canu and Bassler. 1917. 



1917. Odontionella Canu and Bassler, A Synopsis of American Early Tertiary Cheilostome Bryo- 

 zoa, U. S. National Museum, Bull. 96, p. 12. 



1920. Odontionella Canu and Bassler, Monograph North American Early Tertiary Bryozoa, Bull. 

 106, U. S. National Museum, p. 256. 



Ovicell hyperstomial. No condyle for the opercular valve. The opesium is 

 not symmetrical. The proximal border of the opesium bears irregular spinous 

 processes, short, flat, more or less wide. The opesiular indentations are dissym- 

 metrical. The operculum projects beyond the ridge. Sixteen tentacles. The 

 avicularium is placed on the gymnocyst. 



Genotypes. — Odontionella {Memhranipora) Mans Hincks, 1885, and Odon- 

 tionella (Membranipora) occultata Waters, 1887. Range: Pliocene-Recent. 



In 1917 we gave the generic definition of Waters's .¥. Aia/is group. Later 

 studies have permitted us to gain a better knowledge of the structure of this remark- 

 able genus, which must be definitely placed in the Aspidostomidae on account of the 

 nature of the ovicell. The genus differs from Hemiseptella Levinsen, 1912, also 

 deprived of condyles in the nature of the opercular valve, in the presence of a gym- 

 nocyst and of a sort of vestibular arch, in the rarity of the lateral processes, and in 



