198 LIVEEPOOL BIOLOGICAL SOCIETY. 



therefore they cannot be identical with Halisarca rubra. 

 It is well known that the colour in Sponges is sometimes 

 caused by ova. * Still that could scarcely be the explana- 

 tion of the red cells in Halisarca ruhra, as the nuclei of the 

 cells in question are much too small to be the germinal 

 vesicles, and in general appearance the cells did not re- 

 semble ova. 



Order II. CERATOSA. 



Spongelia fragilis, Montagu. 



To the two localties where this species had been found 

 previously, Church Bay, near Holyhead, and Puffin Island,, 

 I am able to add now Penrhos Bay, Anglesey, where we 

 dredged it on the " Hya3na" Expedition of May 25th, 1890. 



This form is probably identical with Lendenfeld's f 

 Spongelia frag lUs var. irregularis. Still there is some differ- 

 ence in the colour. Lendenfeld says in regard to his 

 variety, " the colour of the living sponge is dull violet-red 

 on the surface and yellowish in the interior." My speci- 

 mens are of a yellowish sand-grey throughout. 



Order III. MONAXONIDA. 



Reniera varians, Bowerbank. 



This species, which has been recorded from the Mersey 

 and Hilbre Island, has now been discovered also at Puffin 

 Island. I found one specimen hanging from a ledge of 

 rock at the north end, below the Biological Station, in 

 April, 1889. The under surface of this particular rock 

 was literally covered with other species of sponges : Clathria 

 seriata, Plumohalichoiulria atrasanguinea, Ampliilectus iiicrus- 



* Carter, " Notes Introductory to the Study and Classitication of the 

 Spongida, A.M.N.H,," 4th ser., vol, xvi., p. 37. 



t R. V. LendenfeUi, "A Monograph of the Horny Sponges," p. 662. 



