PLATE 6. 



Erylus caliculatus Lendenfeld. 

 Figures 1-13, 19-23, 26, 28, 29. 



Erylus rotundus Lendenfeld. 



Figs. 14, 18, 24, 33-35. — var. megarhabda Lendenfeld. From A. South Molokai. 



Figs. 15-17, 25, .30-32. — var. typica Lendenfeld. Form B. Kauai. 



Fig. 27. — var. typica Lendenfeld. Form A. South Molokai. 



1, 2. — Microrhabds of Erylus caliculatus: magnified 600; u. v. phot. Zeiss, q. monochr. 6, q. oc. 10. 



3. — Small oxysphaeraster of Erylus caliculatus; magnified 600; u. v. phot. Zeiss, q. monochr. 6, q. oc. 10. 



4, 5. — Groups of microscleros from a centrifuge-spicule preparation of Erylus caliculatus; magnified 600; 



u. V. phot. Zeiss, q. monochr. 6, q. oc. 10: 



a, microrhabds; b, acanthtylasters. 



0-13. — Acanthtylasters of Erylus caliculatus; magnified 600; u. v. phot. Zeiss, q. monochr. 6, q. oc. 10. 



14. — Group of microscleres from a centrifuge-spicule preparation of Erylus rotundus var. megarluihda 



from South Molokai (form A); magnified 600; ii. v. phot. Zeiss, q. monochr. 6, q. oc. 10: 



b, acanthtylasters; c, small oxysphaeraster. 



15, 16. — Acanthtylasters of a dark specimen of Erylus rotundus var. typica from Kauai (form B); 



magnified 600; u. v. phot. Zeiss, C[. monochr. 6, q. oc. 10. 

 17-22. — v\spidasters; magnified 600; u. v. phot. Zeiss, q. monochr. 6, q. oc. 10: 



17, nearly adult aspidaster of a dark specimen of Erylus rotundus var. typica from Kauai (form B) ; 



18, adult aspidaster of a specimen of Erylus rotundus var. megarhabda from South Molokai (form A) ; 



19, adult, circular aspidaster with numerous protruding rays of Erylus caliculatus; 



20, young, circular aspidaster with few protruding rays of Erylus caliculatus; 



21, adult, reniform aspidaster with numerous protruding rays of Erylus caliculatus; 



22, young, smooth, reniform aspidaster of Erylus caliculatus. 



23. — Superficial, paratangential section of Erylus caliculatus; magnified 30; phot. Zeiss, planar 20 mm. 



24. — Radial section through the superficial part of Erylus rotundus var. megarfuibda from South Molokai 



(form A) ; magnified 10; phot. Zeiss, planar 50 mm. 



25. — Radial section through the choanosome of a dark specimen of Erylus rotundus var. typica from 



Kauai (form B); magnified 20; phot. Zeiss, planar 20 mm.: 

 a, radial bundle of rhabd megascleres. 



26. — Radial section through the superficial part of Erylus caliculatus; magnified 30; phot. Zeiss, 



planar 20 mm. : 



a, radial bundle of rhabd megascleres. 



27. — Paratangential section, a small distance below the surface, of Erylus rotundus var. typica from 



South Molokai (form A); magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 

 a, group of triaene-cladomes. 



28. 29. — Radial sections through the choanosome of Erylus caliculatus; aniline-blue: 



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



29, magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



30-35. — Microrhabds of Erylus rotundus; magnified 600; u. v. phot. Zeiss, q. monochr. 6, q. oc. 10: 

 30-32, of a dark specimen of var. typica from Kauai (form B) ; 

 33-35, of a specimen of var. megarhabda from South Molokai (form A). 



