ART. 14 FOSSIL AND EECENT BEYOZOA CANU AND BASSLEE 23 



Occurrence. — Albatross Station D. 2167, off Habana, Cuba; 23° 10' 



40': N.; 82° 20' 30" W.; 201 fms.; coral. 

 Albatross Station D. 2319, north of Cuba; 23° 10' 



37" N.; 82° 20' 06" W.; 143 fms.; gray 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. 

 Coiypes— Cat. No. 7519, U.S.N.M. 



Genus MEMBRENDOECIUM Canu and Bassler, 1917 



MEMBRENDOECIUM STRICTOROSTRIS, new species 



Plate 2, Figure 7 



Description. — The zoarium encrusts nullipores and dead shells. 

 The zooecia are distinct, separated by a deep furrow, a little elongated, 

 oval, ornamented frequently by a convex gymnocyst. The opesium 

 is oval, the point at the top; the mural rim is thick, beveled, enlarged 

 at the base. The ovicell is small, endozooecial, convex, transverse. 

 In the iaterzooecial angles there is a small avicularium, long, very 

 narrow, acuminated. 



Measuremenis.-Oipesmm[f^^^-^^:^-^^ 



fZ2 = 0.45-0.60 mm. 



2««^^'^n?2 = 0.30-0.40 mm. 



Affinities. — The micrometric measurements are quite variable, 

 ranging from one to twice the size and have only an approximate 

 value. The gymnocyst is frequent but in no wise constant and 

 entire colonies are deprived of it. There are cases of total regen- 

 eration. 



The species differs from Memhrendoecium ovatum of the PhiUppines 

 in its long, narrow avicularia. It differs from Membrendoecium sav- 

 arti MacGillivray, 1895, in its mural rim much less enlarged at the 

 base. We have described five fossil species from the Eocene and one 

 from the Miocene of America, so that the genus has therefore per- 

 sisted in the same region since the Claibornian. 



The species was in reproduction and fixation January 17, 1885. 



Occurrence. — Albatross Station D. 2319, north of Cuba; 23° 10' 

 37" N.; 82° 20' 06" W.; 143 fms.; gray coral. 



Holotype.— Cat. No. 7552, U.S.N.M. 



Genus VIBRACELLINA Canu and Bassler, 1917 



VIBRACELLINA LAXIBASIS, new species 



Plate 32, Figure 2 



Description. — The zoarium encrusts very small globular pebbles. 

 The zooecia are distinct, separated by a deep furrow, small, some- 



