Australian Museum Journal Studies in Australian sharks. No. 2
- Shortform:
- Waite, 1902, Rec. Aust. Mus. 4(5): 175–178
- Author(s):
- Waite, Edgar R.
- Year published:
- 1902
- Title:
- Studies in Australian sharks. No. 2
- Serial title:
- Records of the Australian Museum
- Volume:
- 4
- Issue:
- 5
- Start page:
- 175
- End page:
- 178
- DOI:
- 10.3853/j.0067-1975.4.1902.1093
- Language:
- English
- Date published:
- 06 January 1902
- Cover date:
- 06 January 1902
- ISSN:
- 0067-1975
- CODEN:
- RAUMAJ
- Publisher:
- The Australian Museum
- Place published:
- Sydney, Australia
- Subjects:
- FISHES
- Digitized:
- 07 November 2008
- Available online:
- 19 December 2008
- Reference number:
- 1093
- EndNote package:
- EndNote file
- Title page:
- Title page (93kb PDF)
- Complete work:
- Complete work (421kb PDF)
Abstract
It was known to Aristotle, some 350 years B.C., that of two common "Hounds" of the Mediterranean, the embryos of one were developed by the medium of a placenta produced in the uterus, and that the embryos of the other were developed without such placenta. The condition in the former species, Mustelus laevis, is thus described by Balfour :- "The vascular surface of the yolk-sack becomes raised into a number of folds, which fit into corresponding depressions in the vascular walls of the uterus. The yolk-sack becomes in this way firmly attached to the walls of the uterus, and the two together constitute a kind of placenta"