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- W2040477594 abstract "Summary. .Cephalodisus has a lophophoro ot 12 branchial plumes, each of which consists of a central stem or axis with its associated filaments. Each axis becomes enlarged at its distal or free extremity so as to form a conspicuous hollow bulb, the cavity of which is continuous with the cavity of the stem. As the rhabdite-cells are entirely confined to these bulbs, t h e latter may be conveniently termed rhabdite-batteries. Histologically, the wall of the battery is greatly vacuolated, and contains essentially two series of bodies: (1) a series of large nucleated basal cells; (2) above these a series of nou-nucleated bodies lodged in the vacuoles and termed rhabdite-“ cells.” 1 and 2 together, however, are the equivaleut of a rhabdite-cell of a Turbellarian, siuce 2 possesses no nucleus, and 1 contains no secretion. In fact 2 must be regarded as a disassociated portion of 1. The secretion of 2 is primitively a large homogeneous sphere. This may or may not become fragmented. Subsequently there often arise two small aster secretions of unknown origin, fate, and significance. The sphere of secretion afterwards splits peripherally so as to form, first a star-shaped structure, and then a number of stout free rods. The splitting usually leaves a residue, but the whole of the sphere may be used up in the formation of the rods. The rods have been observed arranged in a definite bundle parallel to the long axis of the “cell.” The rods and sometimes the whole “cell” may be found lying outside the battery. No two cells are ever structurally identical, and their position varies from one in close proximity to the basal cells to one in which they lie completely outside the battery. Besides the secretion-spheres and their accessories, they contain a granular substance in varying quantity identified as plasma or a modification of that substance. In all essential respects they are comparable to the rhabdite-cells of the Turbellaria (and are hence of the same nature as the pseudo-rhabdites of Nemertea), since their prime object is to secrete rods and then to discharge them on t o the exterior." @default.
- W2040477594 created "2016-06-24" @default.
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- W2040477594 date "1899-07-01" @default.
- W2040477594 modified "2023-09-25" @default.
- W2040477594 title "On the Discovery and Development of Rhabdite-“cells” in Cephalodiscus dodecalophus, McIntosh." @default.
- W2040477594 doi "https://doi.org/10.1111/j.1096-3642.1899.tb00413.x" @default.
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