OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 479 



FIG. 5. Ophiothrix vitrea: 



a, first ventral arm spine transformed into a hook. 



b, tentacle scale. 



c, club spines of the dorsal surface of the disk. 



d, second arm spine. 



e, dorsal arm spine. 



PLATE 103. 



FIG. 1. Ophiothela danae: 



a, first ventral arm spine transformed into a hook at the end of the 



arm. 



b, first ventral arm spine transformed into a hook at the beginning 



of the arm. 



c, arm spines. 



2. Ophiopteron gratum: 



a, first ventral arm spine transformed into a hook. 



b, tentacle scale. 



c, second arm spine. 



d, third arm spine. 



e, fourth arm spine. 



f, fifth arm spine. 



3. Ophiopteron puncto coeruleum: 



a, first ventral arm spine transformed into a hook. 



b, second arm spine. 



c, lateral spine. 



d, tentacle scale. 



4. Ophiopteron elegans: 



a, lateral arm spines. 



b, first arm spine transformed into a hook. 



c, second arm spine. 



d, club spines of the dorsal surface of the disk. 



e, tentacle scale. 



5. Ophiogymna pulchella: 



a, various arm spines. 



b, first arm spine transformed into a hook. 



c, second arm spine. 



d, spines of the dorsal surface of the disk. 



e, club spines of the dorsal surface of the disk. 

 f t tentacle scale. 



6. Ophiothrix pentaphyllum ; vertebra of an arm: 



a, proximal surface. 



b, distal surface. 

 7. Ophiogymna elegan: 



a, first ventral arm spine transformed into a hook. 



b, second arm spine. 



c, second arm spine more magnified. 



d, various arm spines. 



e, proximal surface of a vertebra. 



f, distal surface of the same. 



