40 PROCEEDINGS OF THE jSTATIONAL MUSEUM vol.72 



in the form of a hollow spine. The aperture is semielliptical, trans- 

 verse ; the peristome, thin and salient, bears two or three short, cylin- 

 drical hollow spines; the opercular valve is much chitinized. The 

 ovicell is small, hyperstomial closed by the operculum. 



,, . A . f^a = 0.08mm. 



Measurements. — Aperturai , ^ . _ 



^ ua = 0.15 mm. 



^ . 1X0 = 0.50-0.55 mm. 

 Zooeciai, „„_ _ 

 Us = 0.35 mm. 



Structure. — The figured specimen, living when dredged, permits us 

 to recognize the real structure of this elegant species. The chitinous 

 ectocyst entirely covers the interior of the zooecium; its distal por- 

 tion is calcified around the aperture and intimately united to the 

 mural rim and to the first costules; the exterior orifice is therefore 

 absolutely similar to the aperture. The opercular valve is much 

 chitinized but it is not detachable. The costules are separated by 

 very large lacunae; their lumen line is very apparent, but the lumen 



pores are not, although, on the con- 



y."->. , \ trary, they are quite visible in a 



/ \ ^^ / \ species from the Jacksonian. The 



g t ,,J trabeculae have a longitudinal lumen 



C line, and a transverse line of junction 



Fig. 5— acanthocella cltpeata, new sfe- is very apparent. We have not ob- 



ll''xt?^''''''^''J\'r' "^ ''■ ^- "" served diatellae, but our preparation 



small foraminifer, X 85, found within . ' , , . 



A ZOOECIUM. c. cribeilina lineata, new was incomplete. The distal spines 

 SPECIES, Operculum, X 85 have the Same structure as the cos- 



tules; this phenomenon appears to 

 be general in all the Costules. 



Affinities. — This new species differs from Acanthocella erinacea Canu 

 and Bassler, 1922, in the presence of four pairs of transverse costules 

 (and not six), in its much smaller dimensions, and in the very salient 

 lateral lumen pores. It differs from Crihrilina tubulifera Hincks, 

 1881, in the much wider zooecia, in less numerous costules, and much 

 larger lacunae. 



Biology. — The species was in reproduction May 1, 1884. It is 

 very rare. 



Occurrence. — Albatross Station D. 2169, off Habana, Cuba; 23** 

 10' 28'' N.; 82° 20' 27" W.; 78 fms.; coral. 

 Albatross Station D. 2373, Gulf of Mexico; 29° 14' 

 00" N.; 85° 29' 15" W.; 25 fms.; coral. 

 Holotype.— Cat. No. 7447, U.S.N.M. 



Family BUGULIDAE Gray, 1848 



Genus BUGULA Oken, 1815 



BUGULA (STIRPARIA) CARAIBICA LeTinsen, 1909 



1909. Bugula caraibica Levinsen, Morphological Studies upon the Chil- 

 ostomatous Bryozoa, p. 104, pi. 11, fig 2. 



