The Shipley Collection of Scientific Papers Volume 84

The Shipley Collection of Scientific Papers Volume 84

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: his report upon the Challenger Tunicata, says (Part m, p. 56): "An otocyst (?) and a pigment spot are found in connection with the ganglion," and again (p. 57): "There is a subneural gland underlying the ganglion. Its duct leads forward, and-opens into the front of the branchial sac just anterior to the peripharyngeal hands. The opening widens out to form a richly ciliated groove"--(the dorsal tubercle). In his diagram illustrating the anatomy of Salpa (p. 55) he figures the gland as corresponding to the description I have quoted. No such neural gland is present. The ciliated funnel does not connect with any duct. Instead of "an otocyst" there are two vesicles ventral to the ganglion which are really the neural gland. Cf. Mbtcalf, 1893, p. 346--361. of the appearance of the gland in Ascidians, Pyrosoma or Doliolum is to be seen. There are present, however, two structures beneath the ganglion, which are glandular in their nature and which, in spite of their peculiar form, there is some reason to believe may be related to parts of the neural gland in other Tunicata. These are the structures which, though never described except in my papers, have sometimes been referred to as otocysts1). They show no structure in any way suggestive of an otocystic nature, but are clearly glandular. On each side, on the ventral surface of the ganglion of the chain form of Cyclosalpa pinnata, there is a discoidal chamber whose walls consist of a single layer of cubical epithelium supported by a basement membrane of unusual thickness (Fig. 67). I have called these chambers the ventro-lateral chambers of the neural gland. Each connects with the pharynx or cloaca2) by means of a greatly coiled tube whose wall, like that of more

Product details

  • Paperback | 92 pages
  • 188.98 x 246.13 x 4.83mm | 181.44g
  • United States
  • English
  • black & white illustrations
  • 1236789695
  • 9781236789693