90 BRITISH SPONGIADJI. 



colours in sponge, gradually fades out and leaves the 

 sponge white (N.). 



" On the 29th June, 1875, Mr. Hillier, of Ramsgate, 

 sent me a specimen of Filustra chartacea from Pegwell 

 Bay, the lower part of the stems of which were thinly 

 coated by H. sulphureus for rather more than half an 

 inch in height " (J. S. B.). 



43. HYMENIACIDON CELATUS (Grant), n, 212; in, PL 

 XXXVIII, figs. 5, 6. 



1867 Cliona celata, Gray. Proc. Zool. Soc., p. 525. 

 1870 Vioa celata, Schmidt. Spong. Atlant. Geb., p. 76. 



44. HYMENIACIDON CLAVIGER, Bow., n, 211 ; in, PL 

 XXXVII, figs. 2022. 



1867 Sulerites clavigera, Gray. Proc. Zool. Soc., p. 523. 



45. HYMENIACIDON TENEBROSUS, Bow., n. sp., iv, Plate 

 XV, figs. 15. 



" Sponge coating, thin. Surface even, smooth. 

 Oscula and pores inconspicuous. Dermal membrane 

 abundantly spiculous ; spicula dispersed, ovo-spinu- 

 late, long, but rather shorter than those of the skeleton. 

 Skeleton abundantly spiculous ; spicula ovo-spinulate, 

 long, and rather slender. Sarcode abundant, dense, 

 dark amber-coloured. 



" Colour. In the dried state, nut-brown. 



" Habitat. Birterbuy Bay, Galway, Ireland ; "West- 

 port Bay tide marks ; Rev. A. M. Norman. 



