1130 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
PLATE XLVIII. 
Fig. 1. Brisinga alberti. Adambulacral plates and armature, 50 mm. from disk, showing also the 
lateral spines ( l . s.), XL Lower spines without membrane, la. Same, from outer third of 
arm, X4. 15. Mouth plates, X5. The first adambulacral is also shown, lc. Sixth adam- 
bulacral spine, 7. . 
Fig. 2. Brisinga evermanni. Adambulacral plates, 65 mm. from disk, X 4. 2a. Same from outer third 
of ray, X 4. The plates should be a trifle slenderer. 2b. Mouth plates, X 5. First adam- 
bulacrals are also shown in center. 2c. Pedicellaria from adambulacral spine. 
Fig. 3. Brisinga fragilis. Side of ray, 35 mm. from disk, X 4. 3a. Mouth plates and first adam- 
bulacral plates, X 5. The single plate to the left represents “variation a,” those in center 
the type, and that on right “variation d,” which has a very thick sacculus on the marginal 
spines. 35. Adambulacral plates, 50 mm. from disk, X 5. 3c. Pedicellaria from one of the 
long adambulacral spines. 
PLATE XLIX. 
Fig. 1. Antheniaster epixanthus. Abactinal view of short-rayed specimen. Note two parasitic gastro- 
pods, one near madreporic body. 
Figs. 2 and 3. Psilaster attenuatus, showing growth stages. 2. Thick-rayed form from south coast of 
Oahu. 3. Typical form. 
