OPHIUBANS OF THE PHILIPPINE AND ADJACENT WATERS. 453 



EXPLANATION OF PLATES. 



The outlines of many of the figures have suffered somewhat owing to the limitations 

 of the process of reproduction. 



All figures enlarged unless otherwise stated. 



PLATE 1. 

 Astrothamnus deficient from station 6605. 



FIG. 1. An entire specimen, dorsal surface. 



2. Lateral view of an arm. 



3. The same. 



4. Ventral surface or an arm. 



5. A hook-shaped spine. 



6. Lateral view of an arm. 



7. The same. 



8. Lateral view of the disk. 



9. Slightly oblique view of an arm near the tip. 

 10. Ventral surface of the disk. 



PLATE 2. 



FIG. 1. Neoplax crassipes from station 5108 ; ventral surface. 



2. The same; dorsal surface. 



3. Ventral surface of an arm. 



4. Ophiocanops fugiens from station 5174; dorsal surface of an entire 



specimen. 



5. The same; a vertebra, with the side arm plates. 



6. The same ; ventral surface of an arm treated with Javelle water. 



7. The same ; lateral view of an arm with the arm spines. 



8. The same ; oblique view of an interradial area of the disk, to show the 



adoral plates. 

 . The same; arm spines. 



13. The same ; dorsal surface of the disk. 



14. The same ; ventral surface of the disk. 



15. The same ; lateral surface of the disk, showing the madreporic orifice. 



