422 



NAOKATSU YANAGI AND VAICHIRO OKADA : 



lìngula dentata, Busk 1852, Cat. Brit. Mar. Poly., I, 46, pi. xxxv.— McCoy 1883, 

 Prod. Zool. Vict., decade VIII, 30, pi. lxxviii, fig. 3, — Waters 1887, Ann. Mag. Nat. 

 Hist., S, XX, 91, pi. iv, fig. 14. — Ortmann 1890, Jap. Bry., 25, pi. i, fig. 20. — 

 Phillips 1899, Willey's Zo >1. Res, IV, 443. — 1 1 ut ton 1904, Ind. Faun. Novse-Zeland., 

 295- 



Numerous colonies in the collection are referable to the above 

 species. The localities are : shallow water of Moroiso ; off Jôgashima ; 

 near Miyake L, one of the Seven Islands of Izu ; Yokohama Harbour; 

 Tomo in Prov. Bingo ; Kushimoto in Prov. Kii. 



19. JBugula japonica Ortmann. 



/w/^ii/a japonica, Ortmann 1890. Jap. Bry., 25, pi. i, fig. 19. 

 Biigida hexacantha, Ortmann 1890, Jap. Bry., 25, pi. i, fig. 21. 



Numerous large colonies of this species from Sagami Sea : viz., 

 Mochiyama (depth unknown), Okinosé 312 fins., and off Jôgashima 234- 

 312 fms. Ortmann has described B. hexacantha as distinct from B. 

 japonica, on the ground of the former being provided with oral spines 

 which are wanting in the latter. However, from examination of a 

 large number of colonies, we have come to the conclusion that the 

 presence or absence of oral spines can scarcely be made a criterion for 

 the specific distinction, since both armed and unarmed apertures may 

 occur in one and the same colony. Thus, in certain colonies, oral 

 spines were found on proximal, but not on distal, zocecia ; while, in 

 certain other colonies, the reverse was the case as regards the relative 

 position of zocecia with armed and unarmed aperture. B. japonica 

 comes near to B. sinuosa B. as well as to B. curvirostrata R. How- 

 ever, it may be distinguished from the former by the presence of 

 connecting fibres between the branches and by the elongate subqua- 

 drangular (instead of elongate-fusiform) shape of zocecia, and from the 

 latter by the absence of the longer avicularia and by the branches 

 being narrower. 



