io6 



TH. MOKTENSEN, 



(Schwed. Siidpolar-Exj 



Plate I. 



Ctenocidaris speciosa Mrtsn. Abactinal side. Most of the radicles of this specimen are 

 wholly invested with the colonies of a Bryozoon of the genus Alcyo7iidium. Nat. size. 



Plate II. 



Cfenocu/aris speciosa Mrtsn. Actinal side. Most of the radioles are closely set with a bi- 

 valve Mollusc of the genus Limopsis. Nat. size. 



Fia. 



Plate III. 



Cleiiocidaris speciosa Mrtsn. Abactinal side. 



» » » Actinal » 



Aiisirociciaris spinulosa Mrtsn. Actinal side. 

 ■) ■> ■) Abactinal :■ 



» » » Young specimen. Side view. 



» canaliciilata (A. Ac.) Abactinal side. 



» •: ■') Actinal » 



» » » Side view. 



All the figures natural size. 



Fig. 



I 



2 



3 



4 

 5 

 6 



7 

 8 



9 



10 



1 1 



Plate IV. 



Ctenocidaris speciosa Mrtsn. Side \iew. 



» :> » Abactinal side. 



» » » Actinal ■■> 



Aiistrocidaris canaliciilata (A. Ac). Side view. 



» 3 > Female specimen. Abactinal side. 



» » » Male -■ >' 



» » » Abactinal side. 



» s » Side view. 



» » » Female specimen. Abactinal side. 



» » » » » » » 



9 » » Actinal side. 



The figures 4, 8, and 1 1 slightly magnified, the rest natural size. 



