JAPANESE CHEILOSTOMATOUS BRVOZOA. 



419 



oœcium which appears to have hitherto remained unknown is of a 

 quadrangular form with flattened and marginally thickened surface. 

 Frontal avicularia are frequently wanting. 



15. Caberea rutlis Busk. 



Caberea rudis, Busk 1852, Cat. Brit. Mar. Poly., I. 38, pi. xLvi, figs. 1, 2. — 

 McCoy 1887, Prod. Zool. Vict , decade XIV, 137, pi. cxxxvi, fig. 1.— Busk 1S84, Chalk 

 Rep., vol. X, pt. XXX, 30. — Ortmarm 189c, Jap. Bry., 23, pi. i, fig. 8. 



This species is represented in the collection by numerous colonies. 

 The localities are : off Jôgashima 80 fms., of the Sagami Sea ; Senkai 

 Bay (depth unknown) in Tsushima ; Tomo (depth unknown) in Prov. 

 Bingo ; Hamajima (2 fms.) in Prov, Shima ; Kanayama (3 fms.) in Prov. 

 Kii. In all the specimens from above localities, the number of oral 

 spines does not agree with that recorded from previously known speci- 

 mens. Of them, there are generally to each marginal zoœcium four or 

 three on the outer side and two on the inner, while on intennarginal 

 zocecia there are two of them on each side. The vibracular seta is not 

 serrated. 



This new form occurs in the shallow water of Aburatsubo, close to 

 the Misaki Marine Biological Station, attached on stones. The chief 

 differences between the typical species and the form under considera- 

 tion, lie in the absence of the large lateral avicularia in the latter and 

 in the direction taken by frontal avicularia. In the present form, the 

 frontal avicularia are directed always obliquely downwards, instead of 

 mostly upwards as in the typical species. 



16. 



Caberea rudis Busk, var. minor, n. var. 



Pl. VI., fig. 6. 



Bicellariidae Hincks 1880. 



Key to the genera. 



I. Colony erect . . . 

 I. Colony creeping 



Beania. 



2. 



