BRYOZOA OF THE PHILIPPINE REGION 369 



large, irregular, very elongated, lozenge-shaped areas, separated by 

 vibices and decorated with granules and 1 or 2 large tuberosities. 

 The. zooecia are indistinct; the salient threads which ornament them 

 do not correspond to the true zooecial limits, but they outline rather 

 regular lozenge-shaped areas in which are arranged two lateral tuber- 

 osities, a central poriform avicularium, the fissured spiramen, and 

 inferiorily the peristomice of the proximal zooecium. The peristo- 

 mice is semilunar, embedded; it bears a very small proximal pseudo- 

 rimule. The ovicell is very small, deeply buried, convex, with a 

 median fissure. 



Measurements. — 



AperturajAa = 0.07 mm. Zooecia [Z,2 = 0.45 mm. 



(interior) \la = 0.10-0.12 mm. (interior)\Z2 = 0.25 mm. 



Affinities. — The salient thread which decorates the zooecia forms 

 false exterior limits which do not correspond to the true limits because 

 the aperture is placed at the base of the lozenge-shaped areas thus 

 formed. 



This species differs from Reteporella miUespinae in the place of the 

 tuberosities, which are not peristomial, in the presence of large per- 

 forations in the lozenge-shaped dorsal areas, and in the absence of 

 an avicularian umbo. 



Biology. — Our magnificent colony was fixed by a very small base 

 on a fragment of shell from which it was separated. Most of the 

 Retepores, moreover, adhere but slightly to their substratum. This 

 specimen was in reproduction on February 21, 1908. 



Occurrence. — D. 5159. Tinagta Island, Sulu Archipelago; 5° 11' 

 50'/ N.; 119° 54' E.; 10 fathoms; co. S. 



Cotypes.—C&t. No. 8156, U.S.N. M. 



RETEPORA FISSA MacGillivray, 1869 



Plate 47, figs. 15, 16 



1889. Retepora fissa Jelly, Synonymic Catalogue of Marine Bryozoa, p. 216 



(bibliography) . 

 1895. Retepora fissa MacGillivray, Tertiary Polyzoa Victoria, Trans. Royal 



Society Victoria, vol. 4, p. Ill, pi. 15, figs. 9, 10. 



The published figures are incomplete or very variable. The synon- 

 ymies published by MacGillivray, 1895, do not seem to us exact. 

 We are not positively certain of our determination. Three fragments 

 only have been found. They were dead. 



Occurrence.— D. 5577. Mount Dromedario, Tawi Tawi; 5° 20' 36" 

 N.; 199° 58' 51" E.; 240 fathoms; era. S.; 12.4° C. 



Geographic distribution. — Pacific; Victoria, Australia, and New 

 South Wales. 



Geologic distribution. — Miocene of Australia (MacGillivray). 



Plesiotype— Cat. No. 8157, U.S.N.M. 



