178 PLATE LXX. 



central canal and three genimules attached to the 

 skeleton fibre. X 250 linear. 



In a specimen examined since the publication of the 

 description of this sponge in vol. ii, p. 380, ' Mon. 

 Brit. Spongiadse,' I have observed numerous gem- 

 mules attached to the fibres of the skeleton and to the 

 inner surface of the dermal membrane. They are 

 membranaceous and aspiculous, oval or spherical, and 

 they vary considerably in size, some of them being not 

 more than half the diameter of the largest ones. Their 

 general appearance is very like that of the greater 

 number of the genimules of the Halichondraceouo 

 sponges. 



DIPLODEMIA VESICULA, BowerbanL 



Vol. ii, p. 357, ' Mon. Brit. Spongiadse.' 



Fig. 12.- -Represents the type-specimen of the 

 species on the fragment of a valve of a pecten. A 

 group of the ovaries is to be seen opposite (). 

 Natural size. 



Fig. 13. One of the spicula in the fibrous part of 

 the skeleton. X 250 linear. 



Fig. 14. A spiculum from the reticulated part of 

 the skeleton. X 250 linear. 



In vol. i, Plate XXXYI, fig. 377, a portion of the 

 compound reticulate skeleton is represented exhibiting 

 the intermixture of the spiculo-reticulate skeleton with 

 the hetro-spiculate fibrous one. X 108 linear. 



In Plate XIV, fig. 273, the same volume, there is a 

 small piece of the hetro-spiculated keratose frbre of 

 the skeleton figured. X 175 linear. 



In Plate XXIII, fig. 324, two of the ovaria are 

 represented. X 83 linear. 



