ADDITIONS. 353 



alive, the colour was a deep flesh-red, and it retained 

 that colour, but of a lighter tint when dried. The 

 structural characters were precisely the same as those 

 of the specimens previously described, with the addi- 

 tion of gemmules which I had not observed in either 

 of the other specimens. These organs were mem- 

 branous and aspiculous, and some of them were filled 

 with well-developed spherical molecules. 



HYMENIACIDON COCCINEA, Plate XXX. 



Among the sponges I received for examination from 

 the Liverpool Museum, there was a specimen of this 

 species, parasitical on the stems of a slender f ucus, 

 binding them together into an irregular elongate mass 

 about three inches in length. The surface in the 

 dried specimen was of the same colour as that of the 

 type one and somewhat more uneven and rugged, and 

 the structural characters were the same in both. It 

 was found in Belfast Lough, in 1872, by Mr. Thomas 

 Higgin, of Huyton, near Liverpool. 



HYMENIACIDON PLACENTULA, Plate LXXII. 



Since the description of this species in the present 

 volume p. 185, I have received a third specimen of 

 this sponge for examination from the Rev. A. M. 

 Norman, labelled " Shetland Haaf." It is very like 

 the one represented in Plate LXXII, fig 5, but about 

 an inch less in length. In its anatomical characters 

 it is precisely the same. 



HALIOHONDRIA GLABRA, Plate XLI. 



Among some other sponges obtained at Hastings, I 

 found a specimen of H. gldbra, parasitical on a sertu- 

 laria, in the form of a thin, flat, irregularly -formed cake 



23 



