207 
Mouth central. The perisome with rather numerous, thick 
plates, among which the anal plate and sometimes also the oral 
plates are distinet. The ambulacral grooves have large side plates, 
and also the covering plates are well developed. 
The genital organs show some features, which are rather unique 
among Crinoids. They lie almost wholly in the arms, not 
in the pin nules, as is otherwise the rule. The testes are quite 
enormously developed, forming two alternate rows of conspieuous 
white bodies of bean-size, joining closely in the median line of 
the arm. The species-name uirilis refers to this peculiarity. The 
ovaries are not nearly so large; they proceed a short way along the 
basal joints of the pinnule, but never so far as to reach the free 
part of the pinnule. Glose to the distal side of each ovary there 
is a large cavity, in which the eggs are hatched. There is no 
widening of the arm- or pinnule-joints; the brooding chamber is 
formed merely by the soft part of the arm. I have found only 1—3 
embryos in each brooding chamber. The opening of the brooding 
chamber lies on a distinet papilla situated in the corner between 
the arm and the pinnule. The genital organs are found only from 
pinnule 3 to 12. 
The species was dredged only at station 5, (64^20’ S. 56^37’ 
W.) in a depth of 150 m. 
The affinities of the genus Notocriiuis are not very clear; it 
seems hardly possible to include it in any of the families of Co- 
matulids as distinguished by A. H. Clark. But the discussion of 
this question must be left till the final paper. 
It is, indeed, astonishing that there should thus prove to be 
in the small amount of Crinoids brought home by the Swedish 
Antarctic Expedition no less than two viviparous forms, while hitherto 
not a single case of viviparous Crinoids was known. This also gives 
additional emphasis to the well-known, but not nearly so well under¬ 
stood, faet that viviparous forms are especially numerous among ant¬ 
arctic Echinoderms. 
As regards the „Antedon Ijirsiita'' of Dr. K. A. Andersson, 
it has already been pointed out by Dr. A. H. Clark that it is not 
identical with P. H. Carpe n ter’s Antedon hirsiita. It must be 
referred to the genus Isometra, established by A. H. Clark. The 
species dredged by the Swedish Antarctic Expedition represents a 
