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"