Bui 1 * U. S. F. C. 1900, Vol. 2. — H. L. Clark. (To face page 264.) 
Plate 14. 
Figs. 1-5. Ophiactis longibrachia.— Fig. 1, Tipper surface, x 1.5. Fig. 2, undersurface, x 1.5. Fig. 3, side view of 3 joints of arm, show- 
ing the number and proportions of the arm-spines, x 5. Fig. 4, one of the upper spines, x 20. Fig. 5, one of the lower 
spines, x 20. 
Figs. 6-9. Ampliiura Mhamula. — Fig. 6, upper surface, : 4. Fig. 7, under surface, > 4. Fig. S, side view of 3 joints of arm, showing the 
number and proportions cf the arm-spines, x 10. Fig. 9, one of the lower spines, showing the little hooks at the 
end, x 40. 
Figs. 10-13. Ophionereis olivacea — Fig. 10, upper surface, x 3. Fig. 11, under surface, -• 3. Fig. 12, side view of 3 joints of arm, show- 
ing the number and proportions of the arm-spines, x 4. Fig. 13, one of the middle arm-spines, x 10. 
Figs, 14-17. Ophioscolex serratus.— Fig. 14, upper surface, x 3. Fig. 15, under surface, x 3. Fig. 16, side view of 3 joints from near middle 
of arm, showing the number and proportions of the arm-spines, ... 5. Fig. 17, one of the upper arm-spines, x 20. 
