BRYOZOA OF THE PHILIPPINE REGION 



375 



a concave proximal border. The ovicell is deeply embedded, convex, 

 with a large median triangular fissure. The operculum closes the 

 ovicell; it is transverse, suborbicular, without visible muscular 

 attachments. (See text fig. 141.) 

 Measurements. — 



. Ik^O.lOmm. „ . \Lz -=0.40 mm. 



Apertura , n in Zooecia, n oc 



The unovicelled zooecia bear 2 to 3 spines on the peristome. The 

 aperture bears a large internal mucron on the proximal border. 



Biology. — The genus Le- 

 praliella had been noted only 

 in the northern seas, but the 

 discovery of a fossil species 

 in the French Aquitanian by 

 Duvergier, 1921, forecasted 

 a much larger geographic 

 extension. Its discovery in 

 the Philippines is the equa- 

 torial zone justified this 

 probability. Our living spec- 

 imens were in reproduction 

 and fixation February 16, 

 1908 (38 meters). 



Occurrence. — 



D. 5147. Sulade Island, 

 Sulu Archipelago; 5° 

 41' 40" N.j 120° 47' 



10" E.; 21 fathoms; Frontal and dorsal surfaces (after Busk, 1860). 

 co. S., Sh. 

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 

 27' 15" E.; 24 fathoms; co. S., Sh. 

 Cotypes— Cat. Nos. 8168, 8169, U.S.N.M. 



Genus PSILESCHARA Busk, 1860 



"Zoarium erect, branched; branches linear, compressed; cells open- 

 ing in one side only, quincunciai in longitudinal series." (Busk.) 



Genotype. — Psileschara maderensis Busk, 1861. 



Range. — Recent (Madeira). 



This type being preserved in the British Museum, a more exact 

 study can be made. 



Genus SPARSIPORINA D'Orbigny, 1851 



The ovicells are recumbent. The suboral pore is at the end of a 

 groove. The zooecia are wide at the distal end, but narrow at the 

 proximal. The frontal is an olocyst. The zoarium is ramose, den- 

 droid, compressed; there are 3-4 longitudinal series of zooecia on the 



Fig. 142. — Genus Psileschara Busk, 1860 

 A, B. Psileschara maderensis Busk, 1860. 



