. Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. â f STAR-FISH AND SEA-URCHINS. 2G7 ft left for its feet to come through, we should have a mental picture of an Echinus. It would only be necessary to add the curious apparatus of teeth (Figs. 40 and 42), which occurs in the Echinus, to increase the size of the spines and pedicellariaB, and to mal a few other such minor alterations; but in all its main features an Echinus is merely a Star- f
. Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. â f STAR-FISH AND SEA-URCHINS. 2G7 ft left for its feet to come through, we should have a mental picture of an Echinus. It would only be necessary to add the curious apparatus of teeth (Figs. 40 and 42), which occurs in the Echinus, to increase the size of the spines and pedicellariaB, and to mal a few other such minor alterations; but in all its main features an Echinus is merely a Star- fish with its five rays calcified and soldered together so as to constitute a rigid box. This cchinoid type itself varies considerably among its numerous constituent species as to size, shape, length and thickness of the spines, etc.; but. Fig. 42.âTeeth of Echinus (from Casscll's " Xat. ;) I need not wait to go into these details. Again, merely inviting momentary attention to the develop- mental history of these animals, I may remark that the phases of development through which an indi- vidual Echinoderm passes are not less varied and remarkable than are the permanent forms eventually assumed by the sundry species. Natural Moveriients, Turning now to the physiology of the Star-fish group, I shall begin by describing the natural movements of the 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 Romanes, George John, 1848-1894. London : K. Paul, Trench
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Keywords: ., bookcentury1800, bookdeca, booksubjectnervoussystem, bookyear1895
