TH. MORTENSEN, 
(Schwed. Südpolar-Exp. 
Explanation of the Plates, 
Plate I. 
All figures in this plate are in natural size. 
. i — 3. Three specimens of Notocrinus virilis , lateral view. In fig. 1 the anal cone, 
with the plating, distinct. 
4. Younger specimen of Notocrinus virilis , lateral view. 
5. Ventral aspect of a small specimen of Notocrinus virilis. 
6. A male specimen of Isometra vivipara , lateral view. 
7. Younger specimen, male, of Isometra vivipara; ventral aspect. 
8. Female specimen of Isometra vivipara , with a number of Pentacrinoids attached to 
the tip of two of its cirri. 
9. Part of an arm of a female specimen of Isometra vivipara , showing the widened 
pinnules. 
10. Ventral aspect of a female specimen of Isometra vivipara; one of the cirri carrying 
Pentacrinoids. 
Plate II. 
1. The calyx and basal part of arms of Notocrinus virilis; showing the perisomatic 
plates. 6 1 1. 
2. Centrodorsal of Notocrinus virilis , with the basalia (rosette) in situ. II /i. 
3. Centrodorsal of Notocrinus virilis; the basalia removed. Shows the basal groove 
and the deep pits of the centrodorsal. 11 /i. 
4. The tip and part of the middle of a pinnule of Notocrinus virilis ; showing the 
side and cover plates. Only a few of the tentacles extended. 37 /i. 
5. The corresponding parts from Isometra vivipara. 37 /i. 
6. Genital pinnule of a female specimen of Isometra vivipara; dorsal view. JI /i. 
7. The same in lateral aspect showing the opening of the marsupium, in which four 
embryos are seen. The tentacles in this figure, as also in fig. 6, are merely 
sketched. 11 /i. 
Plate 111. 
All figures of Notocrinus virilis. 
1 . Proximal part of the arm of a female, grown specimen ; showing the genital papillae 
in the corner between the pinnule and the ambulacral furrow. 7 /i. 
2. Corresponding part of an arm, the skin prepared off and the marsupia opened so 
as to show the embryos lying therein. Below each marsupium is seen an ovary. 10 h. 
