4i8 



NAOKATSU YANAGI AND YAICIIIRo OKADA : 



zocecium, the avicularium is con- 

 siderably larger and is placed 

 below the aperture with the 

 mandible directed downwards. 

 Vibracular appendage exhibits 

 nearly the same feature as that 

 of C. lata B. Ocecia large, 

 prominent, rounded, its summit 

 reaching to the lower apertural 

 margin of superjacent zocecium, 

 smooth surfaced, the wall on 

 one side with elliptical membra- 

 nous fenestra. Root-fibres occur 

 in the same manner as in C. 

 lata B. 



Three colonies of this new 

 species exist in the collection. 

 Localities: Okinosé 234-312 fms. ; Yodomi 78 fms. Characteristic of the 

 species is the dimorphism of frontal avicularia. The two forms of these 

 differ not only in size, but also in the opposite direction taken by the 

 mandible. 



Fig. 5. Cixberea megacereas, n. sp. 



A. Frontal view, showing large frontal avi- 

 cularia. x 32. 



B. Frontal view, showing small frontal avicu 

 laria and oœcia. x 32. 



C. Mandible of small frontal avicularium. 



x 150. 



14. Caherea lata Busk. 



Caberea lata, Busk 1852, Cat. Brit. Mar. Poly., I, 39, pi. xlvii. — Busk 1852, 

 Voy. Ratt., I, 378.— Busk 1884, Chall. Rep., vol. X, pt. XXX, 30.— Ortmann 1890, 

 Jap. Bry., 22, pi. i, fig. 5.— Thornely 1907, Ree. Ind. Mus., vol. I, 183. 



Of this species, there exist in the collection a few large and per- 

 fectly preserved colonies, besides numerous fragments. Localities : off 

 Jògashima 54 fms. ; Meranosé 312 fms. ; Yodomi 62-100 fms. ; off Oda- 

 wara 120 fms., in the Sagami Sea. In all the specimens, the spinous 

 processes are situated on zocecial border. Their presence, as also that 

 of ocecia, are confined to the majority of intermarginal zocecia. The 



