105 



PLATE XLIIL 



HALICHONDEIA COEEUGATA, BoiverbanJc. 



Vol. ii, p. 242, ' Mon. Brit. Spongiadse.' 



Figs. 1, 2. Represent the two living specimens I 

 obtained from the Diamond Ground, off Hastings. The 

 figures are from the specimens in the dried state ; 

 fig. 1, the sponge enveloping a branching zoophyte ; 

 fig. 2, the specimen nearly covering the fan-shaped 

 Desmacidon aagagropila, the fibrous skeleton structure 

 of which is distinctly represented at the base of the 

 figure. Natural size. 



Fig. 3. Represents a portion of the strongly reti- 

 culated dermal membrane of the sponge, with the open 

 inhalent pores in its areas. X 36 linear. 



Fig. 4. A skeleton spiculum. X 150 linear. 



Fig. 5. A spiculum from the interstitial membranes 

 in an immature state of development. X 150 linear. 



Fig. 6. One of the contort, bihamate, retentive 

 spicula, from the interstitial membranes, X 250 

 linear. 



HALICHONDEIA FOECIPIS, Bowerbank. 



Vol. ii, p. 244, ' Mon. Brit. Spongiadse.' 



Fig. 7. Represents one of the three specimens 

 dredged at Shetland in 1864. Natural size. 



Fig. 8. One of the skeleton spicula. X 250 

 linear. 



Fig. 9. A subclavated, cylindrical, tension spi- 

 culum, from the dermal membrane. X 250 linear. 



Fig. 10. One of the large., bidentate, equi-anchorate, 



