ART. 14 FOSSIL AND RECENT BRYOZOA GANU AND BASSLER 21 



Occurrence. — 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. 



Holotype.— Cat. No. 7452, U.S.N.M. 



APLOUSINA TUBEROSA, new species. 



Plate 2, Figures 4, 5 

 Description. — The zoarium encrusts shells, serpulae and especially 

 Steganoporella magnilabris. The zooecia are large, distinct, separated 

 by a furrow, elliptical; the proximal gymnocyst is very small; the 

 mural rim is very thin, flat, granulated, with smooth termen. The 

 opesium is very large and of the form of the zooecia. The ovicell is 

 very small, transverse, little convex, always accompanied by two 

 lateral tuberosities. 



Measurements.— OpesiJ}'' ^ ^'^^ '"^'• 

 ^ [Zo = 0.32mm. 



Zooecia|f^ = 0-60mm. 

 Us = 0.40 mm. 

 Variations. — The micrometric measurements vary from single to 

 double even on the same specimen. The zooecia which begin a 

 series are deformed and oval. 



Afinities. — This species differs from Callopora jilurn Jullien, 1903, 

 in its endozooecial ovicell, in its mural rim enlarged at the base and 

 in which the termen is smooth. 



Biology. — This is a magnificent species of the shelly bottoms. It 

 was in reproduction (ovicelled) May 1, 1884, and March 15, 3 885. 

 The colony and the ectocyst are light colored like the substratum. 

 It lived as a true parasite on Steganoporella magnilabris; the move- 

 ment of the gigantic opercula of this species does not trouble it and 

 it even impedes them by its rapid development. 



We have observed several cases of total regeneration. The species 

 did not cross the Tropics and did not penetrate into the Caribbean 

 Sea. However, we can consider as tropical all the Gulf of Mexico 

 faunas because of the special location of the Gulf. 



Occurrence. — Albatross Station D. 2169, off Habana, Cuba; 23° 10' 

 28" N.; 82° 20' 27" W.; 78 fms.; coral. 

 Albatross Station D. 2317, north of Cuba; 24° 25^' 



45" N.; 81° 46' 45" W.; 45 fms.; coral. 

 Albatross Station D. 2365, east of Yucatan; 22° 18' 

 00" N.; 87° 04' 00" W.; 24 fms.; white rock, 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. 

 Cotypes.—C&t. Nos. 7453, 7454, U.S.N.M. 



