no 



TH. MORTENSEN, 



(Schwed. Südpolar-Exp. 



Fig. lo. Schizaster {Tripylaster) Philippii. Actinal side. Same specimen as Figs. 8 and 

 II. Vi. 

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

 8—10. '/x. 



Plate XIII. 



the figures refer to Ctenocidaris speciosa Mrtsn. 

 Fig. I. Interambulacruni of a specimen infested with Echinophyces; the small pore in the 

 middle is the transferred genital opening, ^/i. 

 .Apical system of a female specimen, ^•''/j. 



Interambulacruni, 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. ♦/i. 

 Valve of globiferous pedicellaria, from the inside. (Comj). Fig. 14.) 7o',_ 

 Transverse section of radiole. ^o,',. 



Actinal radiole of a young specimen, 3 mm. in diameter, ^s/^. 

 » » » » grown » ; side view. ^'^/i. 



5 :; » » » •' ; front view. 3'S/'i. 



All 



2. 

 3- 



10 

 1 1 

 12 

 13 



14 



15 



Valve of globiferous pedicellaria from a 



from the inside, '"s/,. 

 Actinal radiole; front view. 3-sy', 

 Abactinal radiole. 3- 5/,. 

 Actinal » 3'Vi- 



Part of an ambulacrum. '°/"- 

 Valve of globiferous pedicellaria; side view. 

 Actinal radiole. 3- 5/,. 



specimen infested with Echinophyces; 



(Comp. Fig. 4.) 



70 / 

 ' /I- 



Fig. 



II. 

 12- 

 14. 



15- 

 16. 



Plate XIV. 



Part of an ambulacrum of Austrocidaris canaliculata. '^,'1. 



Auricule of Austrocidaris canaliculata; seen from the oral side. V'- 



Part of an ambulacrum of Austrocidaris spinulosa, "■'/i. 



Actinal radiole » » (Comp. Figs. 12 — 13.) ^'^/i. 



Valve of small globiferous pedicellaria of Austrocidaris spinulosa. Side view. 7°/i. 



Apical system of Austrocidaris canaliculata, male specimen; »Altata». 5/i. 

 -8. Actinal radioles of » ■ (comp. Fig. 11). ^U. 



Valve of small globiferous pedicellaria of Austrocidaris canaliculata; »Altata». '°/i. 



Apical system and adjoining upper coronal plates of Austrocidaris canaliculata; 

 ».'Mtata», large specimen. ^'Vi- 



Actinal radiole of Austrocidaris canaliculata. (Comp. Figs. 7 — 8.) V'- 

 -13. Actinal radioles of Austrocidaris spinulosa. (Comp. Fig. 4.) ^'Vi. 



Valve of small globiferous pedicellaria oi Austrocidaris spinulosa, side view. '°'i. 

 » » large » v » » ■• , from the inside. '° i. 



small 



canaliculata, side view, ^°'|■l. 



