4H 



NAOKATSU YANAGI AND YAICHIRü OKADA : 



the same level as the peduncle of the scutum of adjacent zoœcium. 

 Vibracular chamber wedge-shaped, slightly swollen in the middle and 

 pointed at the distal extremity ; placed at the outer lower corner of 

 zoœcium on the dorsal side, stretching obliquely downwards over the 

 back of zoœcium. Vibraculum very short, elongate triangular, not 

 exceeding the cell in length. Oœcia large, prominent, globose, with 

 smooth surface on which a thin and irregularly quadrate area exists 

 at base ; expanded and nearly reaching the lower margin of the aper- 

 ture of the zoœcium situated next above. Rootlets developed only on 

 zocecia in the lower parts of zoarium and given off from near the base 

 of vibracular chamber. 



This new species is based on two large colonies in the collection 

 Both were obtained from a depth of 78 fms. at Yodomi. The species 

 seems to agree closely with Scrupocellaria scabra van Beneden in the 

 general habit of growth and in the prominent features of vibracular 

 appendages, but differs from it in the absence of oral spines and in the 

 larger size of zocecia. 



7. Scrupocellaria diadema Busk. 



Scrupocellaria diadema, Busk 1852, Cat. Brit. Mar. Poly., I, 24, pi. xxviii, 

 figs. 1-3.— Busk 1852, Voy. Ratt., I, 370. — Ortmann 1890, Jap. Bry., 22, pi. i, fig. 4. 

 — Thornely 1905, Rep. Pearl Oyst. Fish., IV, 109. — Thornely 1907, Ree. Ind. Mus. 

 vol. I., 1S1. 



Numerous colonies collected from a depth of 54 fms., off Jôgashima, 

 in the Sagami Sea, are referable to the above species. The margin of 

 zocecial aperture is usually armed with five slender spines, this number 

 being not variable as in the specimens previously described from other 

 localities. The species resembles Scrupocellaria varians H. in many 

 respects, but may be easily distinguished from it by the greater thick- 

 ness of apertural margin, the more numerous spines and the different 

 position and shape of lateral avicularia. 



