. A text-book of invertebrate morphology. Invertebrates. 684 INVEBTEBHATE MORPHOLOOT. spots probably representing eyes, and the subneural gland is present as usual. Each species of Salpa, however, presents two distinct forms {A and B), differing in shape and in the number of the muscle-bands which are found in the mantle and having like- wise a different origin. In the sexual form {A) reproductive organs are developed, the ovary usually containing but a. ma Fig. 290.—A, Salpa mueronata, the sbxtjai Fobm, and B, Salpa democra- tica, THB Non-Sexual Form of Salpa democratica-mucronata (after Glau
. A text-book of invertebrate morphology. Invertebrates. 684 INVEBTEBHATE MORPHOLOOT. spots probably representing eyes, and the subneural gland is present as usual. Each species of Salpa, however, presents two distinct forms {A and B), differing in shape and in the number of the muscle-bands which are found in the mantle and having like- wise a different origin. In the sexual form {A) reproductive organs are developed, the ovary usually containing but a. ma Fig. 290.—A, Salpa mueronata, the sbxtjai Fobm, and B, Salpa democra- tica, THB Non-Sexual Form of Salpa democratica-mucronata (after Glaus). 6, cl = cloaca. m = brauchial pore (mouth). cp = ciliated pit. ma = test. em = embryo. n = nerve-ganglion. en = endostyle. nu = nucleus. 7t = heart. si = stolon. single ovum. This when fertilized (em) is passed into the atrial cavity, the follicle-cells with which it is surrounded forming an adhesion to the wall of the cavity, and later modifying to form a structure recalling the placenta of the Mammalian Vertebrates by which nourishment is conveyed from the parent to the embryo. As the result of the develop- ment of this ovum the non-sexual form (B) is produced, which is characterized not only by its general form, but also by the possession of a stolon (st) arising from the branchial sac iust. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
