Botany and Zoology. 75 
of the right and left uterus, each with a collapsed ovum, of an - 
Echidna captured near Toowoomba, in 1882. In both uteri the 
shown by their floating freely as moved by the feeble wave of 
the menstruum in which the dissection was made. 
The paper closes with a copy of a letter from W. H. Catpwett 
addressed by him to the Sydney (N.S. W.) Herald, Sept. 16, 
1884. Mr. Caldwell observes that in both the Ornithorhynchus 
half inch in the shorter, Ornithorhynchus produces two eggs at 
a birth, Echidna, one; the former places the eggs at the end of 
‘oue of the burrows, the latter her one in a ventral pouch. Mr. 
Caldwell states that he has already worked out most of the stages 
in the development, and hopes to obtain a sufficient number of 
Specimens to complete his investigation during the present breed- 
ing season. He has also obtained, since his arrival last October, 
many embryos of several genera of Marsupials for study. 
_ 4. A Polythalamian from a Salt-pool near Déva in Transyl- 
Yania.—The first known species of a polythalamian from conti- 
hental waters nas been described by Dr. E. von AY. Its 
Shell is much like that of a Rotalia in its spiral form; like 7Zro- 
. : 
Putty in balls and ate freely 10 or 12.balls (12 weighing 20 
Stams, of which 3-3 grams were oil) daily besides their allow- 
of oats. The excrements became white and chalky, fr 
m the oil and very abundant, the quantity of chalk discharged 
amounting to more than one-third the weight of the animals. 
