OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 473 



Fig. 3. Ophiodera neglecta; a and b, arm spines: 



a, from the base of the arms. 



b, from the terminal third. 



c, spinules of the integuments in 0. 



4. Ophiobyrsella intorta; arm spines : 



a, ordinary spines at the beginning of the arms. 



b, first ventral arm spine transformed into a hook on the same 



level. 



c, spines of the terminal third. 



d, first ventral spine on the same level. 



e, spines in the vicinity of the extremity of the arms. 



f, first ventral spine on the same level. 



5. Ophiogema punctata; spines of the dorsal surface of the disk. 



6. Ophwlimna perfida; granules of the dorsal surface of the disk. 



Plate 93. 



Fig. 1. Ophiophryxus confinis; arm spines: 



a, toward the base of the arms. 



b, in the terminal third. 



c, first ventral arm spine at the extremity of the arms. 



2. Astrocharis virgo; arm spines. 



3. Astroceras pergamena; arm spines: 



a and b, ordinary arm spines on the ventral surface of the 

 arms., 



c, spines on the dorsal surface of the arms. 



d, spines transformed into hooks in the terminal part of the 



arms. 



4. Ophiacantha vomposita; club spines on the dorsal surface of the disk. 



5. Ophiacantha pentagona; club spines on the dorsal surface of the disk, 

 (except the first club spine on the left shown magnified). 



6. Ophiotreta valenciennesi ; granules on the dorsal surface of the disk. 



7. Ophiotreta eximia; club spines and arm spines on the dorsal surface of 



the disk. 



Plate 94. 



Fig. 1. Ophientrema leucostictum ; arm spines: 



a, first ventral arm spine transformed into a hook. 

 6, second ventral spine transformed into a hook. 

 c, ordinary lateral and dorsal arm spines. 



2. Ophiomitra dives; granules on the dorsal surface of the disk. 



3. Ophiomelina placida; granules on the dorsal surface of the disk. 



4. Ophiomitrella subjecta ; club spines on the dorsal surface of the disk. 



5. Ophioplinthaca pulchra; granules on the dorsal surface of the disk. 



c, of a specimen from station 5280 collected by the Albatross. 



b, of a specimen collected by the Siboya on which the asperities are 



larger. 



6. Ophioplinthaca globata; granules, club spines, and spines of the dorsal 



surface of the disk in different specimens. 



7. Ophioplinthaca hastata; club spines of the dorsal surface of the disk. 



8. Ophiocamax rugosa; club spines and spines of the dorsal surface of the 



disk. 



