Archive image from page 412 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 TUNICATA. 1197 of the Salpa maxima, the fundamental mass of the gelatinous envelope being composed of the homogeneous substance. It differs, however, in the elements contained in this tissue, and by the presence of a simple layer of epithelial cells, covering it on the interior surface of the test. In the interior layer of the homoge- neous substance there are granulated vesi- cles, having a diameter of O'OOS'' to 0-004/', sometimes having the appearance of
Archive image from page 412 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 TUNICATA. 1197 of the Salpa maxima, the fundamental mass of the gelatinous envelope being composed of the homogeneous substance. It differs, however, in the elements contained in this tissue, and by the presence of a simple layer of epithelial cells, covering it on the interior surface of the test. In the interior layer of the homoge- neous substance there are granulated vesi- cles, having a diameter of O'OOS'' to 0-004/', sometimes having the appearance of nuclei, and sometimes that of cells. In the middle part, here and there, are scattered round or fusiform nuclei; and in the exterior layer are little crystals, round nuclei, and peculiar concretions, similar to those of Salpa maxima. Some of these concretions are small, elegantly ramified, and disposed horizontally ; others are larger, ramified in a brush-like form, and appearing to the naked eye as white tufcs. These latter commence at the surface, descend vertically towards the interior, and ultimately form a tuft of fine ramified rays (Jig- lib. d). Transverse section of the test of Salpa bicaudata, magnified 30 times. (After Lowig and Kolliker.} 1, epithelial layer; 2, homogeneous mass, with nucleoli; b, fusiform and ramified concretions; c, nuclei; d, brush-like concretions. Magnified 350 times, these two sorts of con- cretions are seen to be composed of opaque granules of different sizes. The chemical composition of the test of this Salpa is iden- tical with that of the preceding species. In the Pyrosoma giganteum, the common en- velope of the individuals is also formed of a homogeneous and structureless substance. In its interior are scattered here and there round nuclei, and some ramified cells, similar to those of the loose cellular tissue of the em- bryos of Mammifers, for example, to that of the gelatine of Wharton. Both of these latter elements disappear when
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