The exhibited collections of Sponges and Corals of Echinodermata of Crustacea and of Mollusca may be regarded as at the least thoroughly rpresentative of the Seas of India both in the shallows and in the depths as far as the depths are known at present; but owing in the one case to want of space and in the other case to the incompleteness of our present knowledge the respective collectio [...] At the same time the mesoderm in the wall of the bell becomes much thickened and the gastral cavity in the wall of the bell becomes obliterated except at the cicumference of the bell where it remains as a canal ("cicumferential canal ") and along certain definite lines (usually four in number) which lead from the cavity of the clapper or gastral peduncle to the circumferential canal. [...] They are well seen in the spirit-specimen of Olindias miilleri in Case 3. Further the inside edge of the bell becomes thickened B 2"20 A Guide to the Zoological Collections in the to form a ring of muscle by the contraction of which under the control of a double ring of nerve-tissue the Medusa swims through the water and along the edge of the bell tentacles and sensory organs (auditory and v [...] In structure the Astrmoid much resembles the Turbinoloid coral but the corallum in the Astrwidx differs in having the chambers between the septa (interseptal loculi) more or less crossed by strands of coral known as dissepments." The Astrwidx are represented in Cases 14-15 by the following genera—all from the coral-reefs of the Indian Seas :—Montlivaltia one of the simple Astreans which doe [...] The ntritive canals are well seen in the vertical section of Alcyon ium glaucum and in the transverse section of Spon Bodes in Case 4. The Alcyonacea are represented in Case 4 by the fine spirit specimen of Telesto arborea by the series of dried coralla (mesodermic) of Tubipora musica by the spirit specimens of Alcyonium Lobularia and the fine series of species of Spongodes and by the dr
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