NOTES ON bOME SPECIES OF RETEPORA AND ADEONELLA 



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oval shape (a), without the development of the peaks nor of lateral 

 recesses. 



10. Retepora dendroides (Ortmann). 



Retepora dendroides Ortmann 1890, p. 36, pL II, figs. 27 a and 27 b. 



A large colony of this species obtained at a spot off Odawara 

 (120 fms.) is in the collection. 



Of the ventral avicularia, there are two kinds : the large with 

 triangular pointed mandible and the small with semicircular mandible, 

 the margin of which is recurved and serrated at edge. An avicularium 

 belonging to either of the two kinds may be situated just below 

 zooecial aperture, and a second avicularium of the other kind close to 

 the lower zooecial end ; or it may sometimes be that both the avicu- 

 laria are of the larger kind. Marginal zooecia are mostly provided with 

 vicarious avicularium which has large triangular mandible pointed and 

 curved at end. The avicularian gland is always better developed in 

 avicularia of the smaller size than in those of a large size. In certain 

 zooecium one or two masses of spermatozoa occur on each side of the 

 polypide. The spermatozoa, distinctly visible through decalcified 

 zooecial wall, are relatively large and rod-like and stain deeply with 

 borax carmine. 



11. Metepora minor (Ortmann). 



Retepora minor Ortmann 1890, p. 37, pl. II., fig. 28. 



Two small colonies of this species exist in the collection, both 

 obtained at Yodomi and from a depth of 64-78 fms. In those 

 specimens, most zooecia have one or two small roundish avicularia 

 with minutely crenated semicircular mandible as described by Ort- 

 mann ; more rarely they bear an elongate subelliptical avicularium of 

 a larger size placed below the zooecial aperture, close to and on one 

 side of the labial fissure, instead of the small avicularium mentioned 

 before. Vicarious avicularia are larger than any frontal avicularia and 



