22 TH. MORTENSEN, (Schued. Südpolar-Exp. 



Explanation of the Plates. 



Plate I. 



All figures in this plate are in natural size. 

 Figs. I — 3. Three specimens of Auitflcri/iiis riri/is, lateral view. In fig. i the anal cone, 



with the plating, distinct. 

 Fig. 4. Younger specimen of Notocrinits virilis, lateral view. 

 >> 5. Ventral aspect of a small S]3ecimen of Xohn-riims 7'irilis. 

 » 6. A male specimen of Isometra vivipara^ lateral view. 

 » 7. Younger specimen, male, of hotnetra vivipara; ventral aspect. 



>' 8. Female specimen of Isometra vivipara, with a number of Pentacrinoids attached to 

 the tip of two of its cirri, 

 g. 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. 



Fig. I. The caly.K and basal part of arms of Notocrinus virilis; showing the perisomatic 



[liâtes. ^,1. 

 » 2. Centrodorsal of Notocrinus virilis, with the basalia (rosette) in situ. " r. 

 '- 3. Centrodorsal of Notocrinus virilis; the basalia removed. Shows the basal groove 



and the deep pits of the centrodorsal. " 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. ^', i. 

 >' 5. The corresponding parts from Isometra vivipara. ^^, i. 



» 6. Genital pinnule of a female specimen of Isometra vivipara; dorsal view. '' i. 

 " 7. 'I'he same in lateral asjject showing the opening of the marsupium, in which four 



embryos are seen. The tentacles in this figure, as also in fig. 6, are mereh' 



sketched, "/i- 



Plate III. 



All figures of Notocrinus virilis. 



Fig. I. Proximal part of the arm of a female, grown specimen; showing the genital papilla; 

 in the corner between the pinnule and the ambulacral furrow, '/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. '°/i. 



