TH. MORTENSEN, (Schwed. Sudpolar-Exp. 



10. Schizaster (Tripylaster) Philippii. Actinal side. Same specimen as Figs. 8 and 



11. Schizaster {Tripylaster) Philippii. Abactinal side. Same specimen as Figs. 

 8— io. Vx. 



Plate XIII. 



All the figures refer to Ctenocidaris speciosa Mrtsn. 

 Fig. r. Interambulacrum of a specimen infested with Echinophyces ; the small pore in the 

 middle is the transferred genital opening. 

 » 2. Apical system of a female specimen. 2-4 /i. 



3. Interambulacrum, seen from the inside, from a specimen infested with Echinophyces ; 



most of the genital gland has been prepared away in order to show the course 

 of the extraordinary genital duct. 4 /i. 

 » 4. Valve of globiferous pedicellaria, from the inside. (Comp. Fig. 14.) 



5. Transverse section of radiole. s %. 

 » 6. Actinal radiole of a young specimen, 3 mm. in diameter. 35 /i. 

 » 7. » » » » grown » ; side view. 3 ' 5 /i. 



» 8. » » » » » » ; front view. 3-5 /i. 



» 9. Valve of globiferous pedicellaria from a specimen infested with Echinophyces; 



from the inside. 125 /%. 

 » 10. Actinal radiole; front view. 3-5/j 

 » 11. Abactinal radiole. 3-5 /i. 

 » 12. Actinal » 3 ' s /i. 



» 13. Part of an ambulacrum. IO /i. 



» 14. Valve of globiferous pedicellaria; side view. (Comp. Fig. 4.) 7 %. 

 » 15. Actinal radiole. 3-5 /i. 



1 10 

 Fig. 



Plate XIV. 



Fig. 1. Part of an ambulacrum of Austrocidaris canaliculata. l6 /i. 

 » 2. Auricule of Austrocidaris canaliculata; seen from the oral side. 8 /i. 

 » 3. Part of an ambulacrum of Austrocidaris spinulosa. I4 /i. 



» 4. Actinal radiole » » » (Comp. Figs. 12 — 13.) 6-8 /i. 



» 5. Valve of small globiferous pedicellaria of Austrocidaris spinulosa. Side view. 7 %- 

 » 6. Apical system of Austrocidaris canaliculata, male specimen; »Altata». s /z. 

 » 7 — 8. Actinal radioles of » » (comp. Fig. 11). 8 /i. 



» 9. Valve of small globiferous pedicellaria of Austrocidaris canaliculata; »Altata». 7 %. 

 » 10. Apical system and adjoining upper coronal plates of Austrocidaris canaliculata; 



»Altata», large specimen. 2-8 /i- 

 » 11. Actinal radiole of Austrocidaris canaliculata. (Comp. Figs. 7 — 8.) 8 /i. 

 » 12 — 13. Actinal radioles of Austrocidaris spinulosa. (Comp. Fig. 4.) 6-8 /i. 

 » 14. Valve of small globiferous pedicellaria of Austrocidaris spinulosa, side view. 7 %. 

 » 15. » » large » » » » » , from the inside. 7 %. 



» 16. » » small » » » » canaliculata, side view. 7 %. 



