. Elementary text-book of zoology [electronic resource]. Zoology. SYCANDRA. 103 CHAPTER XII. PORIFERA. SYCANDRA. Class Fic Porifera, Calcarea. 37.âSycandra Sycaiidra compressa is a small marine sponge of a dull yellow tint, found fixed to rocks or weeds between tide marks. -c^^r^ It is in shape like a flat- Form and J n 1 J _ tened rlask and varymg m Habits. , , . \ ^ ^ length up to i\ mch. It is like all sponges axially symmetrical (though the symmetry is often obscured), hence we can distinguish merely a main axis, a base, and an apex. The base is fixed to a foreign bod}^
. Elementary text-book of zoology [electronic resource]. Zoology. SYCANDRA. 103 CHAPTER XII. PORIFERA. SYCANDRA. Class Fic Porifera, Calcarea. 37.âSycandra Sycaiidra compressa is a small marine sponge of a dull yellow tint, found fixed to rocks or weeds between tide marks. -c^^r^ It is in shape like a flat- Form and J n 1 J _ tened rlask and varymg m Habits. , , . \ ^ ^ length up to i\ mch. It is like all sponges axially symmetrical (though the symmetry is often obscured), hence we can distinguish merely a main axis, a base, and an apex. The base is fixed to a foreign bod}^ and the apex has a large opening, the osculum, which i^^'-^^^to sea-weed, with bud, 1 J ⢠, .1 â . ⢠f ,1 natural size. leads mto the mterior of the sponge. If the living Sycajidra be watched carefully in a vessel of water, it will easily be seen that currents of water are, with- out intermission, pouring out of the csculum. Further examination of the surface of the sponge would reveal an immense number of extremely minute openings all over the surface, into which the water perpetually flows. These are termed the pores. If a hand section of the sponge be made it is seen to be hollow, and the wall appears of even thickness all round the central cavity. This cavity is called the para- gastric cavity^ opening through the osculum to the exterior. The walls of the sponge are of a somewhat firm leatheiy consistency and when boiled in potash the animal matter is destroyed, leaving a residue of numerous small spicules, transparent and tri-radiate in shape. These hard spicules dissolve immedi ately, with effervescence, on the application of any dilute Internal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Fir
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