PLATE 5. 



Erylus rotundus Lendenfbld. 



Figs. 1, 3, 11-13. — var. typica Lendenfeld. Form D. Northea.st Hawaii. 



Figs. 2, 4, 17. — var. ty])ica Lendenfeld. Form B. Kauai. 



Figs. 5, 26-28, 31. — var. cidaris Lendenfeld. 



Figs. 14, 15. — var. typica Lendenfeld. Form C. Kauai. 



Figs. 16, 30. — var. typica Lendenfeld. Form A. South Molokai. 



Figs. 18-22, 32. — var. megarhabda Lendenfeld. Form A. South Molokai. 



Fig. 23. — var. megarhabda Lendenfeld. Form B. Kauai. 



Erylus caliculatus Lendenfeld. 



Figures 6-10, 21, 25, 29. 



1-7. — Apical views of triaene-clatlomes; magnified 100; phot. Zeiss, apochr. 16, coinpcns oc. 6: 

 W 1, 3, of Erylus roluiidits var. typica from northea«t Hawaii (form D) ; 



2, 4, of a dark specimen of Erylus rutundus var. typica from Kauai (form B); 



5, of Eryluti rotundus var. ciilaris; 



6, 7, of Erylus culiculatvs. 



8-10. — Side views of triaenes of Erylus caliculatus; magnified 100; phot. Zeiss, apochr. 16, compens. 



oe. 6. 

 11-15. — Amphioxcs of Erylus rutundus var. typica; maguified 100; photo. Zeiss, apochr. 16, compens. 

 oc. 6: 

 11-13, of a .specimen from northeast Hawaii (form D) ; 

 14, 15, of a light specimen from Kauai (form C). 

 16, 17. — Groups of megascleres from spicule-preparations of Erylus rulundus var. typica; niagnifieil 

 100; phot. Zeiss, apochr. 16, compens. oc. 6: 



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



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



a, sharp-pointed amphioxes; b, blunt amphiox (araphistrongyle) ; c, style. 

 18-23. — Ilhabil megascleres of Erylus rotu7idu.s var. megarhabda; magnified 100; ]>hot. Zeiss, apochr. 

 16, compens. oc. 6: 



18, an amphist rongyle of a specimen from South Molokai (form A) ; 

 19-22, amphioxes of a specimen from South Molokai (form \) ; 



23, an ami)liiox of a si}ecimen from Kauai (form B). 



24-28. — Groups of spicules from .spicule-preparations; magnified 100; phot. Zeiss, apochr. 16, com- 

 pens. oc. 6: 



24, 25, of Eiylus caliculatus; 



26-28, of Erylus rolundus var. cidaris; 

 a, (Figs. 24-28) amphioxes; 



c, (Fig. 24) style; 



d, (Fig. 26) triaene; 



e, (Fig. 27) microrhabd; 



f, (Figs. 24, 27, 28) aspidasters; 



g, (Figs. 24, 27) acanthtylasters. 



29-32. — Views of whole specimens; phot. Zeiss, anastig. 4S0/412 mm.: 



29, Erylus calicukUus; natural size; 



30, Erylus rotuiulus var. lypica from South Molokai (form A) ; magnified 1 : l.O.S. 



31, Erylus rotundus \a.T. cidaris; magnified 1 : 1.13; 



32, Erylus rotundus var. megarhabda from South Molokai (form A) ; magnified 1 : 1.08. 



