. Zoology : for students and general readers . Zoology. STRUCTURE OF BRAGHIOPODS. 191 but with no ganglionic enlargements, except in , where they terminate each by a ganglion in the last two posterior muscles. Morse has discovered the presence of auditory capsules in Lingula. Eespiration is mainly carried on in the mantle (pallial membrane). In Lingula the pallial membrane is divided into oblique transverse sinuses, which run parallel to each other. From these arise, says Morse, numerous flattened ampullas, which are highly ^ofwood contractilc. The blood courses in sinus
. Zoology : for students and general readers . Zoology. STRUCTURE OF BRAGHIOPODS. 191 but with no ganglionic enlargements, except in , where they terminate each by a ganglion in the last two posterior muscles. Morse has discovered the presence of auditory capsules in Lingula. Eespiration is mainly carried on in the mantle (pallial membrane). In Lingula the pallial membrane is divided into oblique transverse sinuses, which run parallel to each other. From these arise, says Morse, numerous flattened ampullas, which are highly ^ofwood contractilc. The blood courses in sinuses, showing course taken regular Order up and down these by the blood.—After Morse. ° ^ Sinuses, entering each of the ampullae in tuin. Fig. 130 represents a row of five ampullae with in- dications of the course taken by the blood-disks. These ampullae have not been found in Diffcina, though the pallial sinuses are very prominent. The breathing process is also carried on in the tentacles or cirri. Intimately connected with the vascular system is a gland- ular portion of the tubular part of the segmental organs of the BracMopoda, which is supposed to represent simi- lar parts in worms as well as the glandular, excretory portion of the organ of Bojanus in mollusks, and is supposed to be depuratory or renal in function. The reproductive system of BracMopoda consists of ovaries, oviducts or seg- _, i 1 -ITT* -1 o-i Fisr. 131.—Segmental organs of Brachio- mental organs, J^lg. lOi, pods" «, Dlscma ;*, Terebratulma.—After and spermaries. The sexes ^°^^'^- are probably separate in all BracMopoda (Morse). The ovaries are attached in Discma and Lingula to the delicate vascular membranes of the large sinuses in the pal- lial membranes, the vascular membranes being thrown into conspicuous ruffs when the eggs are ripe. In Terebratulina and Rynchonella they are not only similarly situated, but. Please note that these images are extracted from scanned page images that may have b
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
