186 PLATE LSXII. 



Fig. 11.— One of the spicula from the clei'mal 

 feathei'ly fascicuH. X 250 lineai'. 



Fig. 12. — An average- sized skeleton spiculum. 

 X 250 linear. 



Polymastia coNiciEKA, Bowerbanh. 



Fig. 13. — Represents the type-specimen, in the 

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



Fig. 14. — One of the large external basal defensive 

 spicula. X 123 hnear. This figure also represents 

 the skeleton spicula of the basal mass and the fasciculi 

 of the cloacfe. 



Fig. 15. — One of the smaller skeleton spicula from 

 between the primary skeleton fasciculi of the basal 

 mass. X 123 hnear. 



Fig. IG. — One of the secondary defensive spicula 

 from the surface of the cloacge. X 250 linear. 



Hymeniaoidon fikjius, Bowerhanh. 

 Plate LXXII. 



Sponge massive, parasitical, firm and fleshy. Surface 

 smooth and even. Oscula simple, dispersed few in 

 number. Pores inconspicuous. Dermis strong and 

 tough, abundantly spiculous ; spicula acerate, stout, 

 strong and very thickly felted together, with porous 

 areas sparingly dispersed amid the felted spicula, 

 which are the same in size as those of the skeleton ; 

 dermal membrane translucent. Skeleton. — Abundantly 

 spiculous, closely and comjiactly constructed in all 

 its parts ; spicula acorate, all stout and strong, closely 

 and irregularly disposed. Interstitial membranes trans- 

 lucent. Sarcode very abundant. 



Colour. — In spirit, dull ochreous yellow. 



