BRYOZOA OF THE PHILIPPINE REGION 473 



CHAPERIA TRANSVERSALI3, new spories 



Plate 64, figs. 5-9 



Description. — The zoarium is unilamellar; it is free or creeps over 

 nullipores, bryozoa, or fragments of stone; it is rose color. The 

 zooecia are distinct, separated by a deep furrow imbricated, quite 

 erect distally, a little transverse; the frontal is small, proximal, concave. 

 The aperture is large suborbicular, somewhat transverse; the peristome 

 is thin, sharp ; it bears 4 large distal articulated spines. The trabeculae 

 form an armature in the form of a horseshoe. The ovicell is large, 

 convex, hyperstomial. There is sometimes a small triangular avicu- 

 larium on the frontal. On the inner face the zooecial bases are hex- 

 agonal and ornamented with large tuberosities. 



Measurements. — 



. . ffta = 0.25-0.30 mm. 7 . jLz = 0.80-085 mm. 



Aperture*;, rt „„ ^ n „ Zooecia \ 



\la = 0.30-0.35 mm. ilz = 0.65 mm. 



Affinities. — This species differs from Chaperia galeata Busk, 1852, in 



its trabecular armature in the shape of a horseshoe, in the absence 



r\ 



B 



A U D 



Fig. 202a. — Chaperia Iransversalis new species 



Opercula, X85, of ordinary zooecium (A) and regenerated zooecium (B). 

 C, D. Opercula with narrow muscular attachments. 



of a large and constant frontal avicularium and in its transverse and 

 not elongated aperture. Total regeneration is rather common; it is 

 manifested by the presence of an inner peristome thinner and orna- 

 mented with two spines. 



Waters, 1898, published two opercula of Chaperia galeata; only the 

 first (fig. 8) approaches ours. Perhaps though the structure of the 

 operculum is variable on the same specimen. It is certainly in rapport 

 with the form of the oral trabeculae which appears rather variable 

 themselves. 



Biology. — The unexpected presence of this species in the Sea of 

 Japan was a surprise to us, but the published figures show that 

 our determination is perfectly correct. This large geographic distri- 

 bution is in close connection with its bathy metric occurrence. How- 

 ever our specimens from deep waters are rare, and the species prefers 

 less depths of water. It was certainly ovicelled in the months of 

 February, September, and November. The species is therefore 

 apparently in continual reproduction and neither depth, season, nor 

 locality appears to have any influence on this reproduction. 



