564 ME. H. N. EIDLEY ON THE 



PORIFERA. 



By H. J. Cartek, F.E.S. 



Dry Specimens. 



These were, all too much beach-worn for specific distinction. 



The Nos. correspond with those on the Specimens. 



1. PoLYTiiERSiiS, Duchassaing et Mich.* 



2. IIlRCINIA. 



3. Chalina. — Spicules fine, slender, acerate. 



4. HiRCiNiA. — Fine structure. 



5. EusPONGiA (" best Turkey Spouge " of commerce). 



G. EusPONGiA. — Bearing Polytrevia miniaceum. 



7. Htrcinta.— Skeletal structure partially filled with the 

 filaments of Spoiujiopliaga communis. 



Wet Specimens. 



Most of tliese are too fragmentary for specific distinction, 

 althoiigli possessing the natural characters which they pre- 

 sented when taken from their habitat. 



8. PoLTTHERSEs.- -Two coarse pieces alone ; the rest ni: pieces 

 of a fine Ilircinia. 



9. EuspoNOiA ("best Turkey Sponge" of coimr.ercc"). — Tliree 

 or four discoloured pieces. 



10. ClIO^'DEILI.A NUOULA, Sdt. 



11. Geodia. — ? G. Tiimulosa, Bk. — Siliceous balls spherical. 

 Zone-spicule trifid; arms simple, undivided, extending upwards, 

 outwards, and lastly horizontally. Bearing Po7y//•e«^r^ 



12. CnoNBEOPSis AEENiFERA, Cart. (Ann. & Mag. Nat. 

 Hist. 18S6, vol. xvii. p. 122). — Acuatc spicules, sometimes blunt 

 at each end. 



* It should be rempnibcred that " Po/^tl/erses" is a Hercinia in which the 

 soft parts have been replaced by a structure composed of the filaments of 

 Spongiophaga communis, Cart., which is of world-wide occurrence, but of whicli 

 the nature is still unknown. 



