. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 204 Prof. C. Semper on the Anatomy o/'Comatula. the outer periphery; but here its connexion with the central cord was not brought into view. On the contrary the peri- pheral layer of the central cord clearly passes into the mass of Fiff. 1. Fig. 2. Fig. 1. Transverse section of a decalcified Arm : a, organic basis of the skeleton; n, cord occupying the canal of the calcareous segment, regarded by Muller as a vessel and by Carpenter as a nerve; m, muscles ; , inferio
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 204 Prof. C. Semper on the Anatomy o/'Comatula. the outer periphery; but here its connexion with the central cord was not brought into view. On the contrary the peri- pheral layer of the central cord clearly passes into the mass of Fiff. 1. Fig. 2. Fig. 1. Transverse section of a decalcified Arm : a, organic basis of the skeleton; n, cord occupying the canal of the calcareous segment, regarded by Muller as a vessel and by Carpenter as a nerve; m, muscles ; , inferior or cceliac canal; r, cord regarded by Midler as a nerve, by Carpenter and Semper as the rhachis of the generative system ; ov, ovary ; , superior canal, the tentacular canal of Muller; x, fibrous cord of Perrier and Semper, corresponding in situation with the real tentacular canal of Carpenter. the left ovary. The ova here, as well as in the pinnules, show a distinct germ-vesicle and spot. Muller has seen these con- necting branches, as is shown in the representation of what he calls the nervous cord (l. c. pi. v. f. 16); he interprets them as lateral nerves for the pinnules. Judging from the figure, these branches appear to be very fine; so that, without making sec- tions, Muller might the more readily fail to demonstrate the connexion with the ovaries, as no similar relation in any Echinoderm had given a hint of so peculiar an arrangement of the parts of generation. In what manner these central cords (probably comparable to the rhachis in the ovary of the Nema- toda) are distributed in the disk I have not investigated; Muller, however, states, and Carpenter has confirmed it to me, that they are traceable far up the disk and there form a ring round 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 origi
Size: 1335px × 1871px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
