PLATE 7. 



Erylus rotundus Lendenfeld. 



Figs. ]-10, 42-45, 75, 76, 79. 



— var. cidaris Lendenfed. 



Figs. 16, 40, 48, 54. — var. typica Lendenfeld. Form B. Dark specimen. Kauai. 



Figs. 17, 18, 49-51, 53. — var. typica Lendenfeld. Form A. South Molokai. 



Figs. 19-21, 55, 56. — var. typica Lendenfeld. Form C. Light specimen. Kauai. 



Figs. 22-24, 26, 27, 30; 57-59, 66-73. — var. megarhabda Lendenfeld. Form A. South Molokai. 



Figs. 25, 28, 29, 60-65. — var. megarhabda Lendenfeld. Form B. Kauai. 



Figs. 47, 52. — var. typica Lendenfeld. Form D. Northeast Hawaii. 



Erylus caliculatus Lendenfeld. 

 Figures 11-15, 31-41, 74, 77, 78, 80. 



I- 10. — Branched amphiox-derivates and oxyastrose rhabd-clusters of Erylus rotundas var. cidaris; 



magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 1-3, long amphioxes Vfith two or three shorter branches; 

 4—10, oxyastrose rhabd-clusters. 



II- 15. — Oxysphaerasters of Erylus caliculatus; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. 



oc. 10: 



11, an oxysphaeraster with thicker rays, focused higher; 



12, the same, focused lower; 



13, an oxysphaeraster with thinner rays, focused high; 



14, the same, focused intermediate; 



15, the same, focused low. 



16-21. — Aspidasters of Erylus rotundus var. typica; magnified 300; phot. Zeiss, apochr. 4, compens. 

 oc. 6: 



16, of a dark specimen from Kauai (form B) ; 



17, 18, of a specimen from South Molokai (form A); 

 19-21, of a light specimen from Kauai (form C). 



22-30. — Aspidasters of Erylus rotundus var. megarhabda; magnified 300; phot. Zeiss, apochr. 4, 

 compens. oc. 6: 



22, 23, young aspidasters without protruding rays, of a specimen from South Molokai (form A) ; 



24, 26, 27, 30, adult aspidasters of a specimen from South Molokai (form A) ; 



25, 28, 29, adult aspidasters of a specimen from Kauai (form B). 



31-41. — Aspidasters of Erylus caliculatus; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 



31, a very young, circular aspidaster showing the fine radial rays forming the disc; 



32-35, young, circular aspidasters with few protruding rays ; 



36, 37, adult, circular aspidasters with numerous protruding rays; 



38-40, young, reniform aspidasters with few protruding rays; 



41, adult, reniform aspidaster with numerous protruding rays. 

 42-45. — Aspidasters of Erylus rotundus var. cidaris; magnified 300; phot. Zeiss, apochr. 4, compens. 

 oc. 6: 



46-80. — Microscleres and groups of such from centrifuge-spicule preparations; magnified 300; phot. 

 Zeiss, apochr. 4, compens. oc. 0: 



46, 48, 54, of a dark specimen of Erylus rotundus var. typica from Kauai (form B); 



47, 52, of Erylus rotundus var. typica from northeast Hawaii (form D) ; 

 49-51, 53, of Erylus rotundus var. typica from South Molokai (form A); 



55, 56, of a light specimen of Erylus rotundus var. typica from Kauai (form C) ; 

 57-59, 66-73, of Erylus rotundus var. megarhabda from South Molokai (form A) ; 

 60-65, of Erylus rotundus var. megarhabda from Kauai (form B); 



74, 77, 78, 80, of Erylus caliculatus; 



75, 76, 79, of Erylus rotundus var. cidaris; 



a, (Figs. 46-51, 53-57, 60-75, 77-80) microrhabds; b, (Figs. 52-54, 56-60, 75-77) acanthtylas- 

 ters; c, (Figs. 52, 60, 74, 76) small oxysphaerasters; d, (Figs. 56, 60) very young aspidasters; 

 e, (Fig. 56) adult aspidasters. 



