Ó20 



VAICHIRÔ OKADA: 



colonies and numerous fragments from Yodomi and a depth of 62-78 

 fins., as well as from Onigasé and a depth of 1 17-156 fins. In the 

 habitus of zoarium and in the shape of fenestrae, the specimens differ 

 somewhat from those previously described by authors from other 

 localities. The zoarium is of a simply lamellar or foliaceous shape, 

 not convoluted as in the Australian specimens described by Mac- 

 Gillivray. Some Onigasé specimens possess strongly developed rooting- 

 processes arising from the dorsal surface of the proximal parts of 

 zoarium. The fenestrae in all the Sagami Sea specimens examined 

 are 2.6x1.0 — 2.8x1.8 mm. large. They are distinctly wider than 

 the trabeculae are broad (0.4-0.7 mm.). In comparison with previously 

 described specimens of the species, those now before me seem to have 

 much larger fenestrae and stronger trabeculae. 



6. Metepora punctiligera Ortmann. 



Retepora punctiUgera Ortmann 1890, p. 35, pi. 2, fig. 24. 



This species is represented in the collection by numerous fragments 

 from Onigasé (160-200 fins.) and a small complete zoarium from 

 Yodomi (60-80 fins). The majority of Onigasé specimens have oblong 

 and narrow fenestrae usually measuring about 2.4-4.0 mm. long and 

 1 .0-1.8 mm. wide, with trabeculae of 0.5-O.6 mm. breadth; whereas 

 the specimen from Yodomi has nearly circular fenestrae of 0.6-1.9 mm. 

 length and 0.5-0.9 mm. width, and trabeculae of 0.4-0.6 mm. width. 



In spite of these differences between specimens from the two 

 localities, there exists a perfect agreement in all the important charac- 

 fters of zooecia. l n fact, the size and shape of fenestrae seem to be of 

 not much specific importance. Labial fissure or pore is distinctly 

 present, especially so in the Yodomi specimen. Small oral glands of 

 a subglobular shape always occur near, and dorsal to, the distal end 

 of the tentacle sheath. 



The compensation sac is large and distinct, with moderately thick 

 wall ; it is of an oval outline, narrowed neck-like close to the opening. 



