io6 
TH. MORTENSEN. 
(Schwed. Siidpolar-Exp 
Plate I. 
Ctenocidaris speciosa Mrtsn. Abactinal side. Moèt of the radioles of this specimen are 
wholly invested with the colonies of a Bryozoon of the genus Alcyonidium. Nat. size. 
Plate II. 
Ctenocidaris speciosa Mrtsn. Actinal side. Most of the radioles are closely set with a bi- 
valve Mollusc of the genus Limopsis. Nat. size. 
Plate III. 
Fig. i. Ctenocidaris speciosa Mrtsn. Abactinal side. 
» 2. » » » Actinal » 
». 3. Austrocidaris spinulosa Mrtsn. Actinal side. 
» 4. » » » Abactinal » 
» 5. » » » Young specimen. Side view. 
» 6. » canaliculata (A. Ag.) Abactinal side. 
» 7. » » » Actinal » 
» 8. » » » Side view. 
All the figures natural size. 
Plate IV. 
Fig 
i. 
Ctenocidaris speciosa Mrtsn. 
Side 
view. 
» 
2. 
» 
» » 
Abactinal side. 
» 
3 - 
» 
» » 
Actinal 
» 
4 - 
Austrocidaris 
canaliculata (A. 
Ag.). 
Side view. 
» 
5 - 
» 
» 
» 
Female specimen. 
Abactinal 
side. 
» 
6. 
» 
» 
» 
Male » 
» 
» 
» 
7 - 
» 
» 
» 
Abactinal side. 
» 
8. 
» 
» 
» 
Side view. 
» 
ÇI- 
» 
» 
» 
Female specimen. 
Abactinal 
side. 
» 
IO. 
» 
» 
» 
» » 
» 
» 
» 
1 1. 
» 
» 
» 
Actinal side. 
The figures 4, 8, 
and 1 1 slightly magnified, the Test natural 
size. 
