4RT. 14 FOSSIL AND EECENT BEYOZOA CAFTJ AND BASSLEE 25 



Structure. — The gymnocyst is much developed, contrary to that 

 observed in Antropora granulifera Hincks, 1880. It is broad, convex, 

 and smooth. 



There are two opesia with the same proximal border. The exter- 

 nal (superior) opesium is elliptical, elongated, a little narrowed 

 on the transversal axis; its distal border is confused with that of the 

 mural rim. The inner opesium is subcircular, submedian; its distal 

 border is visible at the bottom of the cell. The cryptocyst entirely 

 surrounds the inner opesium, but the proximal portion between 

 the two opesia forms a concavity more or less deep, which continues 

 below the mural rim and forms a kind of endozooecial ovicell. 

 We suppose that the opercular muscles are lodged in this distal 

 concavity. 



The hypostege is deep and perfected. It is regularly arranged 

 between the mural rim and the salient, crenulated thread which sur- 

 rounds the proximal half of the opesium. 



The avicularia are constant and zooecial; they are apparently 

 indispensable for the movements of the opercular valve, but we can 

 not understand what might be the action of their minute mandible. 



The perforated kenozooecia arranged sporadically between the cells 

 are covered and closed by the ectocyst. 



Total regeneration is revealed by a double mural rim. 



Affinities. — This species differs from Antropora granulifera Hincks, 

 1880, in the presence of a large gymnocyst and of six small distal 

 spines, in its less oblique avicularia, in its smooth cryptocyst, and in 

 its sporadic kenozooecia. 



Harmer, 1926, discovered that the oviceils of Antropora granulifera 

 are endozooecial. Here they are clearly hyperstomial but closed by 

 the operculum. This important difference between the two species 

 is inexplicable to us. 



Biology. — This species appears to live in deep waters. It was 

 ovicelled in May, 1884. Corals form the preferred substratum. 



Occurrence. — Albatross Station D. 2321, Gulf of Mexico, north of 

 Cuba; 23° 10' 54" N.; 82° 18' 00" W.; 230 fms. 

 Albatross Station D. 2167, Gulf of Mexico, off Ha- 

 bana; 23° 10' 40" N.; 82° 20' 30" W.; 201 fms. 



Cotypes.— Cat. No. 7456, U.S.N. M. 



Family FARCIMINARIIDAE Busk, 1884 



Genus LEVINSENELLA Harmer, 1926 



The oviceils are strongly prominent. The zooecia are without 

 spinous processes; the distal wall has a number of scattered unipo- 

 rous septulae. The avicularia are capitate, attached to the distal 



