NOTES ON SOME SPECIES OF RETEPORA AND ADEONELLA 625 



occurring on either side of the labial fissure and partly projecting into 

 the apertural space ; it has a semicircular mandible slightly curved, 

 minutely denticulated at the distal margin and directed obliquely 

 downwards. The medium-sized avicularium {d) is less common, being 

 found mostly below, but sometimes on either side of, the zooecial 

 aperture ; it is spherical and is provided with a broad subtriangular 

 mandible minutely denticulated on the distal margin and variously 

 directed. The large avicularium (/) is the least common, b.ing not 

 present on many zooecia ; it is nearly elliptical in outline, and is 

 provided with a large shield-like mandible. This kind of avicularia 

 occurs mostly just below zooecial aperture but sometimes in the centre 

 of ventral zooecial surface. Ooecia (b) small, circular in outline, 

 weakly inflated, with the lower margin prolonged below into a kind 

 of lamina and extending a short way into the zooecial aperture, 

 smooth on sucface, the ventral wall with a small narrow elliptical 

 fissure in the centre. Dorsal surface of zoarium convex, divided into 

 irregular areas by weak vibices ; each of these areas bear several 

 avicularia which may be distinguished into the same three kinds as 

 those found on the ventral side. In the basal part of zoarium, the 

 surface is almost smooth throughout, all traces of zooecium being 

 nearly completely obliterated. On the distal margin of retracted 

 tentacular sheath there open two small oral glands. 



The collection includes several colonies of this new species, 

 obtained at Onigasé (117-234 fins.), at a spot off Odawara, and 

 in the Kagoshima Gulf (54 fins.). The Onigasé specimen, which I 

 have made the type of the species, is 35 mm. high. All the other 

 specimens are smaller. The Kagoshima specimen is peculiar in that 

 the branches are somewhat truncate at the free end and the ventral 

 zooecial surface is granulated and imperforate, instead of being smooth 

 and perforated. 



The species is one which should be assigned to Reteporella, were 

 this to stand either as a distinct genus or a subgenus under Retepora. 



