127 



PLATE L. 



ISODICTYA ANOMALA, Bowerbank. 



Vol. ii,p 293, ' Mon. Brit. Spongiadse.' 



Fig. 1. Represents the type-specimen of the species 

 from Torbay, by Mrs. Griffiths. Natural size. 



Fig. 2. One of the large, stout, acerate, skeleton 

 spicula of the primary lines of the skeleton. X 250 

 linear. 



Fig. 3. An inflato-fusiformi, acerate spiculum, from 

 the secondary lines of the skeleton. X 250 linear. 



Fig. 4. A slender, acerate, tension spiculum, from 

 the interstitial membranes. X 250 linear. 



ISODICTYA DENSA, Bowerbank. 



Vol. ii, p. 292, ' Mon. Brit. Spongiads?.' 



Fig. 5. Represents the type-specimen of the species 

 in the cabinet of the Rev. A. M. Norman. Natural 

 size. 



Figs. 6 and 7. Two spicula from the skeleton of 

 the sponge. X 250 linear. 



There is a small specimen of Microciona plumosa, 

 adhering to the specimen at (a), figure 5. 



ISODIOTYA PALLIDA, Bowerbank. 



Vol. ii, p. 297, ' Mon. Brit. Spongiadse.' 



Fig. 8. Represents a large and very fine specimen 

 of the species, from the Diamond Ground, off Hastings. 

 Natural size. 



Fig. 9. One of the skeleton spicula. X 250 

 linear. 



Fig. 10. - - A slender, fusiformi-acerate, tension 



