Comparative anatomy / by C.Th. v. Siebold and H. Stannius ; translated from the German, and edited with notes and additions recording the recent progress of the science by Waldo I. Burnett.

  • Karl Theodor Ernst von Siebold
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Comparative anatomy / by C.Th. v. Siebold and H. Stannius ; translated from the German, and edited with notes and additions recording the recent progress of the science by Waldo I. Burnett. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    64/482 (page 60)
    en iiber clie Schirmquallen iiberhaupt, in the Mem. de l’Acad. des Sc. de St. Petersburg, 6 ser. Tom. IV. 1838, p. 239. Milne Edwards. Observations sur divers Acalephes, in the Ann. des Sc. Nat. 2de Ser. Zoologie. Tom. XVI. 1841, p. 194. ADDITIONAL BIBLIOGRAPHY. Forbes. A monograph of the British naked-eyed Medusae, with figures of all the species. London, Ray Society, 1848. Contains'many anatom- ical details. Agassiz. Contributions to the Natural History of the Acalephae of North America. Part I. — On the Naked-eyed Medusae of the shores of Massachusetts, in their perfect state of development. Part II. — On the Beroid Medusae of the shores of Massachusetts, in their perfect state of development. See the Mem. Amer. Acad. Arts and Sc. vol. IV. 1850. Also, Twelve Lectures on Comparative Embryology, delivered before the Lowell Institute, Boston, 1848—49. Busch. Beobachtungen fiber Anatomie und Entwickelung einiger wir- bellosen Seetniere. Berlin, 1851. [The above are among the most important larger works; but see, also, many papers of great value, to which I have referred in my notes.—Edi- tor.] CHAPTER I. SKIN AND CUTANEOUS SKELETON. § 54. Generally, the body of the Acalephae is of a gelatinous substance, com- posed of polyhedral cells. In some species certain parts of the body have a cartilaginous hardness, but it is only in a few that there is found a carti- laginous or calcareous nucleus, comparable to a rudimentary skeleton. With the Diphyidae a large portion of the body has a cartilaginous density, and with the Physophoridae it is often surrounded by plates of a similar nature. The Velellidae have a nuclear skeleton, which in Rata- ria is a simple, elongated disc; but in Velella this disc, which is horizon- tal and of an elongated oval form, is surmounted by a vertical crest. The disc is composed of four pieces joined together by two sutures which cross each other obliquely. The crest, united to the disc along the whole length of the two sutures, and resembling the segment of a circle, is composed of two main pieces, joined in the middle by a third, which is shaped like a wedge.(l) The disc situated under the skin of the upper surface of Porpita, and X Eschscholtz, loc. cit. Taf. XV.; and Lesson, Acaliphes, loc. cit. PI. XII. fig. 1; also,Duperrey, Voyage loc. cit. Zoophytes, No. 6. fig. 1, A. A.