450 
ADAM SEDGWICK. 
purpose of obtaining well-preserved embryos, and of studying 
the development on fresh specimens. 
Accordingly, I went to the Cape in the summer of 1883, 
arriving early in July, and remaining till the middle of 
August. I obtained a large number of specimens, and brought 
back with me over 300 alive. Some of the latter lived at 
Cambridge till the following July. The results of my obser- 
vations at the Cape and after my return to England have been 
to show that the embryos remain thirteen months in the 
uterus ; that the fertilised ova pass into the uterus in April, 
and the young are born, fully developed, in the May of the 
year following. That is to say, the young ova pass into the 
uterus one month before last year’s young are born. I was 
not prepared for this, and I did not, in 1884, examine my spe- 
cimens for the early stages until May, when the young were 
being born. The result was that I missed last year the early 
stages of development, and had it not been for the kindness of 
Mr. "Walter Heape, who went to South Africa last summer, and 
who collected and brought back some more live specimens, I 
should have been obliged to leave the early stages undescribed. 
Thanks to him, however, and to my experience gained last year, 
I have this April been able to find several of the younger 
stages, and to complete my observations. 
Two species ofPeripatus are commonly found at the Cape. 
One, the most common, is the well-known Capensis; the 
other is a new species, differing from Capensis in having 
eighteen pairs of fully-developed legs, in being of a smaller 
size, and in other points. This species I propose to call Peri- 
patus Balfouri. It will be fully described in the forth- 
coming monograph by Moseley and myself on the ‘ Species of 
Peripatus.’ 
Besides the work of Balfour and Moseley on the develop- 
ment of Peripatus capensis, some observations on the 
development of a West Indian species have been published by 
Dr. J. Kennel, of Wurzburg (Semper’s ‘Arbeiten,’ Heft ii, 
Bd. 7). I do not propose to enter here into any detailed ex- 
amination or criticism of Dr. Kennel’s account of his observa- 
