or Little Known, Polyzoa. 131 



row of long, stout spines, the outer directed forwards and 

 outwards, and the inner series, alternating with these. 

 arching close over the front of the cell, and meeting in the 

 mesial line. Dorsal surface smooth, glassy : in many, 

 especially the marginal cells, a round mark on each side 

 towards the base, probably marking the attachment of a 

 radical fibre. No avicularia. 



Portland, Mr. Maplestone ; Port Phillip Heads, Mr. J. B, 

 Wilson. 



This species is readily distinguished from the other Aus- 

 tralian forms by the closeness of the cells, the six large 

 spines at the anterior extremity, and the absence of avicu- 

 laria. The peculiar 7 arrangement of the marginal spines, 

 alternately directed outwards and inwards, is not constant, 

 but when present is very striking. It is evidently very 

 closely allied to the form described from Algiers by Mr. 

 Hincks as Diaehoris hirtissima, var. robusta, from which it 

 differs in having two instead of three superior spines, and 

 in the total . absence of avicularia. This and Heller's 

 D. hirtissima, in both of which avicularia are absent, clearly 

 prove the invalidity of Diachoris as a genus, the only reason 

 for distinguishing which from Beania consists in the presence 

 of these organs. 



Family Flustrhxe. 

 Craspedozoum, n. genus. 



Zoarium uni- or bilaminate, in strap-shaped divisions ■ 

 each branch bordered in its whole extent by a bundle of 

 radical fibres springing from the bases of the lateral zocecia. 

 Zocecia quadrate, area partly filled in by a thickened lamina. 

 Ooecia external, with a thickened rim or band at or near the 

 margin, usually produced at the summit into a more or less 

 prominent point. 



In the Annals and Magazine of Natural History for 

 August, 1881, Mr. Hincks described and figured a remark- 

 able form from near Port Curtis as Membranipora roborata, 

 pointing out at the same time the doubtfulness of its 

 position, its characters being intermediate between those of 

 Flusbra and Membranipora, and agreeing with Gray's 

 Flustramorpha in the presence of a lateral band of radical 

 fibres. This species occurs also at Port Phillip Heads and 

 Portland (Maplestone). At the Heads two other species 

 have also been found, agreeing with it in then essential 



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