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"

 
Download Complete Work

Bibliographic Data

Short Form
Waite, 1902, Rec. Aust. Mus. 4(5): 175–178
Author
Edgar R. Waite
Year
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
en
Date Published
06 January 1902
Cover Date
06 January 1902
ISSN (print)
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
1093.enw
Title Page
1093.pdf
File size: 93kB
Complete Work
1093_complete.pdf
File size: 421kB