(chemistry) A vessel with two portions unequally exposed to heat, and with connecting pipes or passages, through which the fluid rises from the overheated portion, and descends from the relatively colder, maintaining a circulation.
He defined them as possessing radial instead of bilateral symmetry, and as apparently destitute of nervous system and sense organs, as having the circulatory system rudimentary or absent, and the respiratory organs on or coextensive with the surface of the body; he included under this title and definition five classes, - Echinodermata, Acalepha, Entozoa, Polypi and Infusoria.
Pectinibranchia.-In this order there is no longer any trace of bilateral symmetry in the circulatory, respiratory and excretory organs, the topographically right half of the pallial complex having completely disappeared, except the right kidney, which is FIG.
- From the mesoderm most of the organs of the body - muscular, circulatory, reproductive - take their origin.
The circulatory system of Carinella is considerably different, being more lacunar and less restricted to definite vascular channels.
- Diagram conveying the digested food-products all over of the circulatory the body, and the excretory products to the apparatus in the annephridia, and doubtless it serves at times to tenor body-region of assist in the extension and retraction of parts a Metanemertine.
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