386 A. E. Yerrill — JSTorth American Ophiuroidea. 



EXPLANATION OF THE PLATES. 

 Plate XLII. 



Figure 1 — Amphillmna olivacea (Lym.) Ver., p. 318. Under side of a part of 



the disk and the proximal part of an arm. x 7. 

 Figure la — The same. A row of spines from the middle of an arm. x 18. 

 Figure 2 — Ophiodera Stimpsoni (Lym.) Ver., p. 363. Under side of a part of the 



disk and of a ray. x 7. 

 Figure 2a — The same. A row of spines, x 28. 



Figure 26 — The same. Under side of the distal part of an arm. x 7. 

 Figure 2c — The same. One of the teeth, x 18. 

 Figure 3 — Ophiomyxa tumida Lym., p. 380. Under side of a part of the disk 



and of an arm. x 7. 

 Figure 3a — The same. A row of spines from the middle of an arm. x 12. 

 Figure i — Ophiomyxa brevicauda Ver., p. 380. Under side of a part of the disk 



and of an arm. x 5. 

 Figure 4a — The same. One of the teeth, x 28. 

 Figure 5 — Undetermined Ophiuran (Young ?). Nearly vertical view of two 



joints from the middle of an arm. x 28. 

 Figure 5a — The same specimen. Side view of two joints from the distal parts 



of an arm. x 28. 

 Figure 6 — Astronyx Lymani Ver., p. 377. Type. Under side of a part of the 



disk and of an arm. x 7. 

 Figui-e 6a — The same specimen. Side view of three joints from the middle part 



of an arm. x 9. 

 Figure 66 — The same. Hook-shaped spines, more enlarged. 

 Figure 6c — The same. Hooks from the distal part of an arm. 

 Figure 7 — Sigsbeia murrhina Lym. Young, p. 365. Under side of a part of the 



disk and of two arms, x 6. 



Plate XLHI. 



Figure 1 — Opkiozona nivea Lym., var. compta Ver., p. 303. Type. Upper side 



of the disk and bases of the arms, x 4. 

 Figure la — The same specimen (297, Blake Exped.). Under side of the disk. 



x3K. 

 Figure 2—Ophiocamax austera Ver., p. 355. Type. Under side of a part of 



the disk and of an arm; m, madreporic plate, x 5. 

 Figure 3 — Ophiomitra ornata Ver., p. 350. Type. Under side of a part of the 



disk and of an arm; 77i, madreporic plate, x 5. 

 Yiguxe ^—Ophiopristis ensiferciYev., p. 347. Type. Under side of a part of 



the disk and of an arm. x 6. 

 Figure 5 — Amjjhijjsila maculata Ver., p. 348. Under side of a part of the disk 



and base of an arm. x 7. 

 Figure 5o — The same. A row of spines from the middle of an arm. x 14. 

 Figure 6 — Ophioplus tuberculosus Ver., p. 365. Dorsal side, x 5. 

 Figure 6o — The same. Under side, x 7. 



Figure 66 — The same. Profile view of a part of the disk and coiled arms, x 7. 

 Figure 6c — The same. Side view of a part of the middle of an arm. x 5. 

 Figure Qd — The same. Dorsal view of a more distal part of an arm. x 5. 



