REVISION ''BRITISH SPONGIADiE." 259 



Quasillina hrevis, B., XI. (Ridley and Dendy, 14, 

 p. 226; Vosmaer, 21, p. 20.) 

 Genus Halicnemia, Bowerbank. 

 Sponge symuietrical, flat discoid, with marginal fringe 

 of long spicules. Megascleres tylostyli. Microscleres (?) ; 

 spined centrotylotes. 



Note. I am not sure whether the small spined centro- 

 tylote spicules which Bowerbank describes in H. 

 patera (but no figures) are to be regarded as micros- 

 cleres. Vosmaer fused this genus with Polymastia, 

 but, as I think, without sufficient reason. Nor can, 

 according to Hansen {10, p. 8), Halicnemia be fused 

 with Badiella, as Marenzeller had done. 

 Halicnemia patera, B., XV. 



Genus Cliona, Grant. 

 Boring Suberitidae. Megascleres tylostyles. No mi- 

 croscleres. 



Cliona ce/ai^f^,Grant, XXXVIII and LXIV. (Hanitsch, 

 8, p. 216.) 



Family II. Tethyid^, Vosmaer. 

 The ectosome is usually a well developed cortex with 

 distinct fibrous laj^er. Megascleres styh or tylostyh, 

 radially arranged. Microscleres, when present, spherasters 

 or microrrhabds. 



Note. I include under this family also the genus 

 Hijmedesmia, B., as represented by H. stellata, B., 

 although this is a thin encrusting sponge without 

 cortex. An encrusting sponge very similar to H. 

 stellata, but possessing oxyasters instead of chiasters 

 was dredged last year in Liverpool Bay, for which I 

 propose the provisional name H. acato-stellata. Its 

 spiculation, but not its mode of growth, reminds one 

 strongly of Axinella stiiposa. Thus Hijmedesmia 

 ought perhaps be included under the Axinellidae. 



