Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 450 ZOOLOGY. 782. The rlio borealis is well known to the whale-fishers and others as whale9sfood; this species swarms in the Arctic seas, and, when the weather is calm, these little animals may be Clio Borealis. seen floating in myriads upon the surface. According to Cuvier, the sea is sometimes so glutted with them that the whales cannot open their mouths without engulfing thousands of these small molluscs. An analogous species, the C. australis, appea
Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 450 ZOOLOGY. 782. The rlio borealis is well known to the whale-fishers and others as whale9sfood; this species swarms in the Arctic seas, and, when the weather is calm, these little animals may be Clio Borealis. seen floating in myriads upon the surface. According to Cuvier, the sea is sometimes so glutted with them that the whales cannot open their mouths without engulfing thousands of these small molluscs. An analogous species, the C. australis, appears equally abundant in the polar regions of the southern hemisphere. 783. The hyalcea is a little pteropod possessed of a shell, which is formed almost upon the model of that of the Conchifera. It consists of two valves or plates applied to the two surfaces of the body; of these one is larger than the other, and from the aperture between them, the animal sends forth two large yellow and violet wings or sails, by the action of which it moves with great velocity on the surface of the sea. ' The animals of this order,' observes Mr. Kirby, 'both from the beautiful colouring of their filmy sails or wings, and from their number and symmetry, are better entitled to the appellation of the but- terflies of the ocean, than the scallop-shells (Pedens) which have sometimes been so called.' Their delicate structure is ill adapted to encounter an agitated sea, or the dangers of a rocky or shallow shore ; and it is only in the vast and deep ocean that their elegant forms and colours, and their graceful movements, delight the mariner's eye, when the glassy surface of the still sea reflects the rays of the setting sun. 808. What other variety is described ? 809. Describe the last species named.
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