. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PORIFERA. 67 Fig. a, c, d, Spicula of Tethea Cranium; d, three forked spicula; c, fusiform spicula; a, cuticular spicula; b, spicula of Tethea Lynciirium. (After Johnston.} cavity within them, extending from the one point to the other ; and on the inflated part of each spiculum we observe a ragged open- ing, as if a portion had been driven out by the expansion of some contained fluid. In those spicula which had suffered little change of form by their incandescence. I have never failed to observe the same cavity with
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PORIFERA. 67 Fig. a, c, d, Spicula of Tethea Cranium; d, three forked spicula; c, fusiform spicula; a, cuticular spicula; b, spicula of Tethea Lynciirium. (After Johnston.} cavity within them, extending from the one point to the other ; and on the inflated part of each spiculum we observe a ragged open- ing, as if a portion had been driven out by the expansion of some contained fluid. In those spicula which had suffered little change of form by their incandescence. I have never failed to observe the same cavity within ex- tending from one end to the other, and a dis- tinct open rent on their side by which the contained matter has ; The exist- ence of this central cavity has likewise been recognised by Mr. Bowerbank, who, more- over, observes, that it is " lined with an ani- mal membrane, which becomes converted into a thin film of carbon when the spicula are exposed to the action of the ; Gelatinous cortex.—" In the recent and living sponge, all its canals and pores are filled with a glairy colourless fluid like the white of an egg, which flows freely out on the removal of the sponge from the water. The quantity of this fluid varies according to the species. In some, it is copious even to nauseousness, but in the compact Halichondrise, there is little of it, and in the Grandse it appears to be en- tirely ; * It " has an unctuous feel,, emits a fishy odour when burnt, leaves a thin film of membrane when evaporated, and appears to the naked eye, transparent, colour- less, and homogeneous, like the white of an egg : but when a drop of it is examined on a plate of glass under the microscope, it appears entirely composed of very minute, transparent, spherical or ovate granules like monads with some moisture. These monad-like bodies, nearly all of the same size and form, resemble the pellucid granules or vesicles which Trem- bley has re
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