OP THE SPONGIAD^. 289 



Fig 



380. Spongionella 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. 

 — . Chalina, Grant. See Figs. 262, 263, 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 fibro-membranous interstitial structure in 



situ. X ]75Unear. See also Figs. 256, 257, 



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



Page 211. 



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