Kirkpatrick — Hydroida and Polyzoa, Torres Straits. 615 



angle, and two quite rudimentary ones on the upper outer 

 margin. 



The beaks of the avicularia curve round at right angles, and 

 the ends are broad and grooved, and not pointed. 



Habitat. — Station 4 ; 6-7 fms. 



Membranipora coronata, Hincks. — " Ann. Mag. Nat. Hist." (5), 

 vii. 1881, p. 147, PL x., fig. 1. 



Membranipora hastilis, Kirkpatrick. — Ibid. (5), ix., 1882, p. 188. 



I regret that Mr. Hincks' note, giving further particulars 

 of the structure of Membranipora coronata, escaped my notice. 

 There is no doubt that Membranipora hastilis is synonymous with 

 M. coronata. 



Habitat. — Ceylon ; Singapore or Philippines ; Macclesfield 

 Bank, China Sea ; Murray Island, Torres Straits. 



Chorizopora brongniartii, Audouin, var. spinosa. 



(PL xvi., fig. 4.) 



The variation consists in the presence of two pairs of short 

 glossy spines on each side of the orifice. The upper pair is bifur- 

 cated. The interzooecial network is largely developed. A slight 

 peristomial ring is developed round some of the orifices of the cells. 

 In every other respect this variety resembles the typical form of 

 the species. Chorizopora vittata, Mac Gillivray, also occurs, grow- 

 ing on the same fragment of rock. The marking on the front wall 

 of the zooecium is trifoliate. 



Habitat. — Encrusting rock : Murray Island, 15-20 fms. 

 {Station 14). 



Membranipora radicifera, Hincks, var. intermedia, nov. var. 

 (PL xvi., figs. 1, 2.) 



Three small fragments of this variety occur, one of which is 

 firmly attached to a piece of coral. The variation from the type 

 consists chiefly in the development of the spines. 



On one side of the orifice is a bifurcated spine, growing partly 

 vertically, and partly arching over the area ; on the opposite side 



