52 BRITISH SPONGIAU^, 



siderable distances in various directions ; and this 

 peculiarity, combined with the slender, smooth, and 

 blood-red colour, forms an important discriminative 

 character of the species. The interstitial spicula are 

 few in number and very irregularly dispersed, and 

 they are of the same form and size as those of the 

 other parts of the sponge. 



" It is remarkable that in this species of the genus 

 there is only one form and size of spiculum which is 

 common to all parts of the sponge." 



5. Mtoeooiona Ljivis, Bow., II, 127 ; iii, PI. XXIII, 



fig. 7—11. 



1867 Abila lavis, Gray. Proc. Zool. Soc, p. 539. 



6. MiOEOOIONA SIMPLIOISSIMA, Bow., Ill, 204 ; PI. 



LXXIII, figs. 16—19. 



1868 Mierodona simpUdssima, Bowerbank. In last Report 



of Dredging among the Shetland Isles ; Norman on 

 Porifera, Brit. Assoc. Rep., 1868 (1869), p. 330. 



7. MiOEOCIONA FALLAX, BoW., II, 128. 



1869 Sophaxfallcue, Gray. Proc. Zool. Soc, p. 521. 



1870 Scopalina fallaai, Schmidt. Spong. Atlant. Geb., p. 76. 



8. MiOEOOIONA SPINULENTA, Bow., II, 132 ; III, PI. XXIV, 



figs. 1—6. 



1870 Eeperia spinulmia, Schmidt. Spong. Atlant. Geb., p. 76. 



Mabitat. — Shetland, 1864, Messrs. Peach and 

 Jeffreys {fide Bowerbank in litt. ad A. M. N.). 



