564 



ME. H. TT. EIDLEY ON THE 



PORIFERA. 



By H. J. Cartee, E.R.S. 



Dry Specimens. 

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

 The Nos. correspond with those on the Specimens. 



1. PoLTTHEESES, Di^cliassaing et MicJu* 



2. IIlECINIA. 



3. Chalii^a. — Spicules fine, slender, acerate. 



4. HiECiNiA. — Fine structure. 



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



6. EusPONGTA. — Bearing Folytrema miniaceum. 



7. HiECiisriA. — Skeletal structure partially filled with the 

 filaments of Sjpongiojphaga communis. 



Wet Specimens, 



Most of these are too fragmentary for specific distinction, 

 although possesf^ing the natural characters which tliey pre- 

 sented when taken from their habitat. 



8. PoLTTHERSES. — Two coarsc pieces alone; the rest on pieces 

 of a fine Ilircinia. 



9. EuspoNGiA ("best Turkey Sponge" of commerce"). — Three 

 or four discoloured pieces. 



10. ClIOIiUEILLA NTJCULA, Sdt. 



11. Geodia. — ? G. Tumulosa, BJc. — Siliceous balls spherical. 

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

 outwards, and lastly horizontally. 3earmg 2^0 Jytrem a. 



12. Chondeopsis aeenifeea, Cart. (Ann. & Mag. Nat. 

 Hist. 1886, vol. xvii. p. 122). — Acuate spicules, sometimes blunt 

 at each end. 



* It should be remembered that " Poiytherses" 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 soft parts have been replaced by a structure composed of the filaments of 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 which 

 the nature is still unknown. 



