ioS 



TH. MORTENSEN, 



Schwed. Siidpolar-Exp. 



Plate VIII. 



All the figures represent Loxechinus albas, natural size. 



Fig. i. Side view 1 

 » 2. Abactinal side/ Same specimen. 

 » 3. Actinal side J 

 » 4. Abactinal side. 



Plate IX. 



All the figures represent Abatus cavernosas; all 3-5 /i. 

 Actinal side of a specimen of 9 mm. length. 

 Abactinal » » » » » 8.5 » » 



Posterior end 

 Actinal side 



Abactinal 



Actinal 



Abactinal 



Actinal 



Abactinal 



Actinal 



Abactinal 



Actinal » 



Abactinal 



Actinal 



Abactinal 



Plate X. 



Abatus Agassizii, young specimen; actinal side. 3 

 » cavernosas ; high form Abactinal side. z /x. 

 » Agassizii; same specimen as fig. r. Abactinal side 

 » cavernosas ; high form. 9- Abactinal side. z /t. 

 » Agassizii. 9- Abactinal side. */*• 

 » cavernosus, young specimen. Abactinal side. '/r. 



Same specimen as Fig. 3. 



