Hydrozoa and Poly zoa from the China Sea. 21 



lateral sharp incurved denticles ; gigantic avicularia, projecting 

 obliquely forwards, with large spatulate mandibles. 



Ooecium subglobose, prominent, slightly flattened in front ; 

 perforated by numerous pores, giving it a frosted appearance. 



Hob. Tizard Reef, 6 fath. 



Smittia rostriformis, Kirkpatrick. 



Hob. Tizard Reef, 27 fath. 



The specimen from the Tizard Reef varies slightly from 

 the type specimen from Mauritius. The avicularium in the 

 former does not project vertically upwards from the front of 

 ooecium, but is situated obliquely along the border. 



Schizoporella Cecilii, Audouin, var. (PI. V. fig. 8.) 



The specimen illustrates in a striking manner the transition 

 from the zooecial to the avicularian cell. The avicularia 

 differ externally from the zocecia in the prolongation of the 

 operculum into a broad spatulate mandible and in the 

 presence of from four to six short spines round the upper 

 margin of the cell. The notch in the orifice and the separ- 

 able opercular shaft which fits into it are present both in the 

 zooecial and avicularian cells. 



Hah. Incrusting coral, Tizard Reef, 6 fath. 



Retepora pecttnata, n. sp. (PI. V. figs. 6-6 c.) 



Zoarium slender, branching freely without forming fenestras ; 

 zocecia flat, smooth, rhomboidal, rising anteriorly to a tall 

 tubular hyaline peristome, equal in height to the length of the 

 cell : summit of peristome denticulate, within the margin a 

 circle of horizontal denticles. On the front of the body of the 

 cell a small avicularium with a short broad spatulate mandible. 

 Dorsal surface vibicate, showing areas of the individual 

 zocecia ; small avicularia scattered about. 



Ooecium very small, globular, hyaline, with a faintly marked 

 vertical ridge, from each side of which radiate concentric striae. 

 Chitinous appendages. Operculum quadrangular ; length 

 *08 mm., breadth '06 mm. 



Hah. Growing on Retepora monilifera ; Macclesfield, 27 

 fath. 



The single specimen of this beautiful species is about half 

 an inch in height. 



In the mode of branching, and in the presence of a high 

 tubular peristome, the specimen resembles Tarritigera stellata, 



