474 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



PLATE 95. 



FIG. 1. Ophiotreta gratiosa; club spines and spines of the dorsal surface of the 

 disk. 



2. Ophiotreta matura: 



a, club spines and spines of the dorsal surface of the disk in dif- 



ferent specimens. 



b, very short club spines of the specimen from station 5359. 



c and d, the first (d) and second (c) ventral arm spines trans- 

 formed into a hook. 

 e, tentacle scale. 



3. Ophiophthalmus relictus; granules on the dorsal surface of the disk. 



4. Ophiomitretta sagittate; club spines on the dorsal surface of the disk. 



PLATE 96. 



FIG. 1. Ophioplinthaca rudis; club spines on the dorsal surface of the disk. 



2. Ophiactis savignyi; arm spines. 



3. Amphiura ambigua; arm spines. 



a, second and third spine. 

 6, fourth spine. 



c, first ventral spine. 



4. Amphiura uncinata; first ventral arm spine at the base of the arm. 



5. Amphiura vadicola; arm spines. 



a, second spine. 



b, other spines. 



6. Amphiura commutata: 



a, arm spines. 



b, tentacle scale. 



7. Amphilimna multispina: 



a, spines on the dorsal surface of the disk. 



b, arm spine. 



8. Ophiocentrus aculeatus; arm spines. 



9. Amphioplus legatus; arm spines. 



10. Amphioplus lucidus; arm spines. 



a, first ventral spine. 



b, second spine. 



c, third spine. 



11. Ophiocentrus vexator; arm spines. 



12. Ophiocentrus asper; arm spines. 



13. Ophiomyces delata; arm spines: 



a, small ventral spines. 



b, the same. 



c, lateral and dorsal spines. 



14. Ophiopholis mirabilis; first ventral arm spine and granules of the dor- 



sal surface of the disk. 



o, first ventral spine in the first third of the arm. 



b, first ventral spine in the second third of the arm. 



c, first ventral spine toward the tip. 



d, three granules of different sizes on the dorsal surface of the disk. 



