OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 479 



Fig. 5. Ophiothrix vitrea: 



a, first ventral arm spine transformed into a hook. 

 6, 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. 

 o, 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. 

 6, tentacle scale. 

 c, second arm spine. 

 "~~ 1&, third arm spine. 

 e, fourth "aria-spine. 

 /, fifth arm spine. ~— ■> 



3. Ophiopteron puncto coeruleum?^ .. 



a, first ventral arm spine transformed into a hook, 

 o, second arm spine. ^~ -_ 



c, lateral spine. "^ v 



d, tentacle scale. 



4. Ophiopteron elegans: 



a, lateral arm spines. 



o, 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, tentacle scale. 



6. Ophiothrix pentaphyllum; vertebra of an arm : 



a, proximal surface. 

 6, distal surface. 

 7. Ophiogymna elegans: 



a, first ventral arm spine transformed into a hook, 

 o, 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. 



