. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. the Nervous System of Dipliyes. llo cesses, witli curtain-like flaps between them, bound the polype- cell, including the apex of the distal nectocaljx. This latter is also four-sided and laterally compressed, bearing the ])ro- pulsive chamber or nectosae above, and a deep longitudinal groove for the cliaplet of polypes beneath, while the free ex- tremity terminates in a double-pointed projection. All the angles and edges of both nectocalyces are faintly serrated, with the poin
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. the Nervous System of Dipliyes. llo cesses, witli curtain-like flaps between them, bound the polype- cell, including the apex of the distal nectocaljx. This latter is also four-sided and laterally compressed, bearing the ])ro- pulsive chamber or nectosae above, and a deep longitudinal groove for the cliaplet of polypes beneath, while the free ex- tremity terminates in a double-pointed projection. All the angles and edges of both nectocalyces are faintly serrated, with the points directed towards the base in each, so as to offer little or no resistance to the water during natation. The figure will give a suificient idea of the general characters of this species, without further description, except what is to be said of the nervous system, the exposition of which is the principal object of this paper. At the base of the polype-cell, just within the attachment of the coenosarc, and above the duct of the somatocyst, there appeared to me to be a little ganglionic mass; but of this I cannot be quite certain until I investigate the matter a little more closely. I am satisfied, however, that I have been able to trace a nerve-trunk from that point along the inferior wall of the polype-cell to the angle between it and the open end of the nectosae, the upper wall of which is supplied with two long and tapering nerves, bifurcating from the primary trunk. A second principal nerve was distinctly traceable into the A,. A, the proximal nectocalyx: a, polype-cell, lodging tlie coenosarc and polypes; b, somatocyst, communicating with the coenosarc cavity; c, nectosae or propulsive chamber, B, the distal nectocalyx : a, protective groove for the polypes; b, pedicel of the nectosae including the nerve ; c, the nectosae. C, chaplet of coenosarc and polypes. D, the nervous system: 1, nervous centre ? ; 2, proximal nerve-trunk; 3, distal nerve-trunk; 4, branches to proxim
Size: 2512px × 995px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
