The microscope and its revelations / by William B. Carpenter.

  • Carpenter, William Benjamin, 1813-1885.
Date:
1868
Catalogue details

Licence: Public Domain Mark

Credit: The microscope and its revelations / by William B. Carpenter. Source: Wellcome Collection.

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    of grains of Sand, fragments of Shell, &c. ; whilst they are distributed along the two sides of the Body in such as swim freely through the water, or crawl over the sur- faces of rocks, as is the case with the Nereidce, or simply bury themselves in the sand, as the Arenicola or ‘Lob- Worm.’ In these Respiratory appendages the Circulation of the fluids may be distinctly seen by Microscopic examina- tion ; and these fluids are of two kinds,—first, a colour- lessfluid, containingnumerous cell-like corpuscles, which can be seen in the smaller and more transparent species to occupy the space that inter- venes between the outer sur- face of the Alimentary canal and the inner wall of the Body, and to pass from this into Canals which often ramify extensively in the Respiratory organs, but are never furnished with a re- turning series of passages,— and second, a fluid which is usually red, contains few floating particles, and is en- closed in a system of proper vessels that communicates with a central propelling organ, and not only carries the fluid away from this, but also brings it back again.. In Terebella we find a dis- tinct provision for the aera- tion of both fluids ; for the first is transmitted to the tendril-like Tentacula which suiTound the mouth (Fig. 327, b, b), whilst the second circulates through the beau- tiful arborescent Branchiae Fig. S27. Circulating Apparatus of Terebella conchilega :—a, Labial ring ; b, b, Tenta- cula ; c, first segment of the trunk ; d, skin of the back ; e, Pharynx ; /, In- testine ; g, longitudinal muscles of the inferior surface of the body; h, Glan- dular organ (liver ?); i, organs of Gene- ration ; j, Feet; k, k, Branchiae; l, Dorsal Vessel acting as a Respiratory Heart; m, Dorso-Intestinal vessel ; n, Venous Sinus surrounding oesophagus; n', in- ferior Intestinal vessel; o, o, Ventral trunk ; p, Lateral Vascular branches. s s 2