105 



PLATE XLIII, 



Halichondeia oorrugata, Boiverhank. 



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



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

 obtained from tlie Diamond Ground, off Hastings. Tlie 

 figures are from tlie specimens in tlie dried state ; 

 fig. 1, tlie 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, bihaniate, retentive 

 spicula, from the interstitial membranes. X 250 

 linear. 



Halichondeia foecipis, Boioerhank. 



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 260 

 hnear. 



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

 culum, from the dermal membrane. X 250 linear. 



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



