PLATE IV. 
Page 
Figs. 1, 2. PARARCHASTER SPINOSISSIMUS, 1. Sp. .« : 12 
Fig. 1. Adambulacral and infero-marginal plates; magnified 10 diameters. 
Fig. 2. A portion of the abactinal surface, showing the armature of the abactinal 
plates, and the papule ; magnified 15 diameters. 
[For macroscopic figures of this species see Pl. I. figs. 1, 2. ] 
Figs. 3, 4. PARARCHASTER PEDICIFER, 0. sp. é : 5 15 
Fig. 3. Adambulacral and infero-marginal plates ; magnified 5 diameters. 
Fig. 4. A portion of the abactinal surface ; magnified 15 diameters. 
[For macroscopic figures of this species see Pl. I. figs. 3, 4.] 
Figs. 5, 6. PARARCHASTER ARMATUS, 0. Sp. : : : 19 
Fig. 5. Adambulacral and infero-marginal plates; magnified 15 diameters. 
Fig. 6. A portion of the abactinal surface, showing the spinelets on the abactinal 
plates, and the papule ; magnified 20 diameters. 
[For macroscopic figures of this species see Pl. I. figs. 5, 6. | 
Figs. 7, 8. PARARCHASTER SEMISQUAMATUS, D. sp. . : ‘ (i 
Fig. 7. Adambulacral and infero-marginal plates ; magnified 5 diameters. 
Fig. 8. A portion of the abactinal surface ; magnified 10 diameters. 
[For macroscopic figures of this species see Pl. II. figs. 1, 2.] 
Figs. 9, 10. DyTasTER EXILIS, n. sp. . : : : 65 
Fig. 9. Adambulacral and infero-marginal plates; magnified 15 diameters. 
Fig. 10. A portion of the abactinal surface ; magnified 30 diameters. 
[For macroscopic figures of this species see PI. II. figs. 3, 4. ] 
Figs. 11, 12. DyrTasrer sPrnosvs, n. Sp. j . 5 63 
. 11. Adambulacral and infero-marginal plates ; magnified 5 diameters. 
. 12. A portion of the abactinal surface ; magnified 15 diameters. 
[For macroscopic figures of this species see Pl. V. figs. 1, 2.] 
