PLATE XL VI. 



HALICHONDRIA PATTERSONI, Bowerbank. 



Vol. ii, p. 255, ' Mon. Brit. Spongiadse.' 



Fig. 1. The largest specimen of the species that I 

 have seen. It is in the cabinet of the Rev. A. M. 

 Norman ; it was labelled from the Minch, 1866. 

 Natural size. 



Fig. 2. Represents three small specimens of H. 

 Pattersoni parasitical on a small stem of a zoophyte, 

 for which I am indebted to the Rev. A. M. Norman, 

 who obtained it at the Minch in 1866. Natural size. 



Fig. 3. One of the incipiently spined, tension 

 spicula, from the dermal membrane. X 250 linear. 



Fig. 4. An acuate, entirely spined, skeleton spi- 

 culum. X 250 linear. 



Fig. 5. A dentato-palmate, inequi-anchorate, reten- 

 tive spiculum. X 530 linear. 



Fig. 6. A bidentate inequi-anchorate spiculum. 

 from the interstitial membranes of the sponge, repre- 

 sented by fig. 1. I did not obtain any of this form in 

 the type-specimen. It was not in nearly so fine a state 

 of preservation as the specimens obtained by Mr. 

 Norman at the Minch. X 530 linear. 



HALICHONDRIA HYNDMANI, 



Vol. ii, p. 264, ' Men. Brit. Spongiadse.' 



Fig. 7. Represents a fine specimen of the species 

 on a shell of Pecteu opercularis, from the Diamond 

 Ground, off Hastings, (a a} the sponge, (b) a patch of 

 Cellepora pumicosa. Natural size. 



Fig. 8. Represents a fine detached mass of II. 

 Hyndmani from the Diamond Ground. It is in a fine 

 state of preservation, and exhibits the surface charac- 



