OP THE SPONGIAD^E. 289 



FIG 



380. SPONGIONKLLA PULCHELLA, Bowerbank. Exhibiting 

 the nearly rectangular mode of disposition of the 

 primary and secondary keratose fibres of the 

 skeleton. X 50 linear. 



Sub-Order 2. 



378. HALISPONGIA, Blainville. Showing one of the large 

 primary keratose fibres, containing siliceous spi- 

 cula, and the irregular system of small aspiculous 

 keratose fibres. X 175 linear. 



Sub-Order 3. 

 -. CRALINA, Grant. See Figs. 262, 2G3, Plate XIII. 



Sub- Order 4. 

 . VERONGIA, Bowerbank. See Fig. 266, Plate XIII. 



Sub- Order 5. 



-. AULISKIA, Bowerbank. See Fig. 267, Plate XIII, 

 and Fig. 268, Plate XIV. 



Sub- Order 6. 



381. STEMATUMENIA, Bowerbank. A section at right 

 angles to the surface of a young Stematumenia 

 exhibiting the regular semi-areno fibrous skeleton 

 and the fibre-membranous interstitial structure in 

 situ. X 175 linear. See also Figs. 256, 257, 

 and 260, Plate XII, and Fig. 269, Plate XIV. 

 Page 211. 



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