56 BRITISH SPONGIAD^. 



Oenus 18. — HyMEDESMU, Bow., i, 190; n, 8. 



1. Htmbdbsmia inflatAj Bow., hi, 248 ; PL ^LXXIX, 

 figs. 5—8. 



2. HXMEDESMIA OCCULTA, BoW., III. 250; PI. LXXIX, 



figs. 9—11. 



1868 Byniedesmia occulta, Bowerbank. Last Report of 

 Dredging among tte Shetland Isles; Norman on 

 Porifera, Brit. Assoc. Rep., 1868 (1869), p. 331. 



3. HyMEDESMIA EADIATA,5oiO.,II, 149 ; III, PI. XXVIII, 



figs. 1—4; PI. XXIX, fig. 8. 



1867 Epicles radiosus. Gray. Proc. Zool. Soc, 521. 



Habitat. — On a fossil valve of Pecten Islatidicus, 

 dredged by Dr. Jeffreys and myself in the Mincli in 

 1866 (N.). 



4. HxMEDESMiA iUdistii^cta, Bow., Ill, 304 ; PI. 



LXXXYII, figs. 1—10. 



6. Htmedesmia pansa, Bow., n. sp., iv, PI. I, figs. 1 — 4. 



" Sponge coating, thin. Surface uneven. Oscula 

 simple, dispersed. Pores inconspicuous. Dermal 

 membrane pellucid, aspioulous. Skeleton composed 

 of numerous, wide, flat patches of parallel, long, 

 slender, acuate spicula, intermixed with numerous 



