132 PROCEEDINGS OF THE NATIONAL MUSEUM vol.72 



pretty mosaic. At the center of each polygon there is a small tubular 

 very oblique pore. In transparency, the tremopores are widely 

 spaced. On the interior, the zooecial walls are very thin. The 

 tremopores are very small and little visible. 



Biology. — The zoarium encrusts dead shells, corals, nullipores, and 

 bryozoa. 



Our specimens are yellow colored. Smitts specimen "had a 



yellowish color, with the zooecial aperture, through their covering 



membrane and operculum of a darker greenish-yellow tint" (Smitt). 



The specimens dredged alive were in reproduction March 15, 1885. 



The colonies are always very small and we have not been able to 



study the avicularia. 



Occurrence. — Albatross Station D. 2152, 23^-^ miles northwest of 



Habana Light; 387 fms.; coral. 



Albatross Station D. 2405, Gulf of Mexico; 28° 45' 



00" N.; 85° 02' 00" W.; 30 fms.; gray sand, broken 



coral. 



Albatross Station D. 2639, Straits of Florida; 25° 04' 



50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 

 Fowey Light, 15 miles south of Miami, Fla.; 40 fms. 

 Florida, 110 meters (Smitt). 

 Plesiotype.—C&t. No. 7604, U.S.N.M. 



TREMOSCHIZODINA ANA TINA, new species 



Plate 33, Figure 10 



Description. — The zoarium is incrusting. The zooecia are distinct, 

 separated by a deep furrow, elongated, subrectangular; the frontal 

 is convex, striated transversely, perforated by very small and much 

 scattered pores. The apertura is suborbicular or somewhat trans- 

 verse; two small points separate the anter from a concave rimule, 

 very broad and little distinct. There are large avicularia shaped like 

 a duc¥s bealc arranged sporadically between the zooecia. 



,, ^ A X \ ha = 0.15-0.17 mm. 



Measurements. — Aperture , 



^ Ua = 0.17 mm. 



„ . fX2 = 0.75-0:85 mm. 

 Zooecia,, _ ,_ _ __ 



1/2 = 0.40-0.50 mm. 



. . T . [iai' = 0.85 mm. 

 Avicularia^, ^ „^ 



liav = 0.25 mm. 



Affinities. — This new species differs from the recent Tremoschizodina 



lata Smitt, 1873, in which the frontal and the aperture are identical 



in its larger dimensions and in the presence of a large interzooecial 



avicularium. Tremoschizodina insciformis Duvergier, 1921, of the 



French Miocene (genotype) and the recent Tremoschizodina crassa 



Canu and Bassler from the Philippines have a frontal with tremopores 



and a zooecial avicularium. The form of the aperture of the first is 



