5G BRITISH SPONGIADJ1. 



Genus 18. HYMEDESMIA, Bow., i, 190; IT, 8. 



1. HYMEDESMIA INFLATA, Bow., in, 248; PL LXXIX, 

 figs. 58. 



2. HYMEDESMIA OCCULTA, Bow., in. 250; PL LXXIX, 

 figs. 911. 



1868 Hymedesmia occulta, Bowerbank. Last Report of 

 Dredging among the Shetland Isles; Norman on 

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



3. HYMEDESMIA RADIATA,^OW;.,II, 149 ; in, PL XXVIII, 

 figs. 14; PL XXIX, fig. 8. 



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



Habitat. On a fossil valve of Pecten Islandicus, 

 dredged by Dr. Jeffreys and myself in the Minch in 

 1866 (N.). 



4. HYMEDESMIA INDISTINCTA, Bow., in, 304 ; PL 

 LXXXVII, figs. 110. 



5. HYMBDESMIA PAXSA, Bow.,n. sp., iv, PL I, figs. 1 4. 



" Sponge coating, thin. Surface uneven. Oscula 

 simple, dispersed. Pores inconspicuous. Dermal 

 membrane pellucid, aspiculous. Skeleton composed 

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

 slender, acuate spicula, intermixed with numerous 



