r^ EXPLANATION OF PLATES. 



[All figures are reproductions of instantaneous photographs made in the natural 

 environment with a submerged camera on orthochromatic plates with the aid of a 

 color screen.] 



Plate i. 



Fig. I. Rock ledges near the beach, showing 3 Ahudefduf maiginalus banded with 

 black and yellow-white, and 2 grunts {Hccmulon sp., apparently sciiirits) 

 striped with blue and yellow. A spherical "head" of living coral 

 (Poritcs) in the middle background. Note the upper Abudcfduf swim- 

 ming by the use of the pectorals. When these fish are seen endwise 

 against the surface film the bands blend and the fish are then almost 

 invisible. 



Fig. 2. Ahudefduf marginatus seen in crevasses of a reef of massive coral. Note 

 everywhere over the reef the mantle of living coral polyps {Orbicella). 



Pl,-\TE 2. 



Fig. 3. At least three Hicmulon fiavolincalui}i. French grunt, among coral rocks and 

 Millepora at the base of a reef. The stripes are silvery lavender-blue 

 and chrome yellow. At the right a large snapper (apparently Lutianus 

 afiodus) conspicuously banded in black or brown and yellow. 



Fig. 4. A small labroid fish of an unidentified species feeding on the rock bottom; at 

 its left a branching gorgonian (Plcxaura). 



Pl.^te 3. 



Fic. 5. Two blue surgeons (Hepatus carculcus) in front of a branching gorgonian 

 (Plexaura) on bottom rock. Note the lancet in the caudal peduncle of 

 the one at the right. In front of the surgeons a Chirtodon occUatus, the 

 tail of which moved during exposure. The entire dorsal, anal, pelvics 

 and caudal peduncle are spectral yellow. 



Fig. 6. A Cha-todon capistratus over an incrusting coral (Ma-aiidriiia) on bottom rock 

 and in front of large gorgonian on which expanded polyps may be seen 

 immediately over the fish. The fish is nearly gray, with much yellow on 

 snout and fins. 



Plate 4. 



Fig. 7. In the foreground Iridio bivittatus (slippery Dick) feeding on bottom. The 

 stripes at a little distance appear black and white. In the background a 

 second Iridio bivitattus above, and a Hirmnlon fiavoliiiratuin or French 

 grunt below. 



Fig. 8. Massive coral (Orbicella) on the outer face of a reef. In the lower right- 

 hand corner an Elacatimis oceanops clinging to the coral. The stripes 

 are very light and very dark blue and appear nearly black and white. At 

 the left an expanded tuhe-inliabiting annelid (Spirobranchiis tricornis). 



Fig. 9. The gray snapper (Lutianus griseus). as it appears over the coral sand near the 

 shore; an instance of aggressive resemblance. 

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