138. The American Naturalist. 
II, the same two minutes later. Fig. 12, the same three minutes later than S 
Fig 11. Fig. 13, a single chromatophore, more highly magnified after pig- _ L 
ment has begun to be formed. Fig. 14, outline of embryonic shield and 
ring, with chromatophores beginning to be freed; A and 4. Fig. 15,a larva 
just freed from the membrane, 1.4 mm.; the chromatophores contracted. 
A ae 
Ray tee ee ae ae Mee 
oe eget E aR 
PLATE II.—The same larva-(Fig. 15) twenty hours afterwards, I. 6 mm. 
Fig. 17, another more advanced larva, 1.7 mm. long. 
Serranus maculofasciatus.—The aim being to show the chromatophores, 
the details of the embryo were not as well attended to as they otherwise — 
would have been. Figs. 18-28 represent the successive positions of the free 
chromatophores from the time they become free till they have nearly a 
the ahaha The exact times when the drawings were made are indicated 
the figures. The egg figured was probably fertilized at about 5 P.M : 
the day preceding the stages represented. Figs. 19-22 and 24 show 
merely one side of the embryonic shield. In Fig. 25 the lateral cells 
have begun to be pigmented Figs. 18-26, Zeiss, A and 4; Figs. bes 
A and 2. 
PLATE III.—Fig. 29, slightly older egg than Fig. 28; A and 4. Fig. Ks 
the free chromatophores have reached the oil-sphere, the yellow cells lying 
on the upper surface, the black on the lower surface; the chromatophores 
of the body have become more densely pigmented ;'A and 4. Fig. 304, 
chromatophore (the nucleus is not seen), with the color-granules from the 01 
sphere of Fig. 30; D and 4. Fig. 30%, another chromatophore, she 
nucleus, also from oil-sphere of Fig. 30; D and 4. Fig. 31,a l later stage, 
‘the yellow cells having aggregated in large masses; A and 4. Fig. 
immediately after hatching, the yellow cells being large, the black 3 
small, all the cells contracted; A and 4. Fig. 33, twelve hours after h 
ing, the cells expanded to their utmost and constantly changing: 
4, 2.2 mm 
frase Vtg 34, a newly hatched larva of Serranus nebulifer ; 2.67 
__ Fig. 34a, one of the chromatophores from the tail,«nore enlarged; Da 
Fig. 35, Oligocottus analis, twelve hours after hatching ; dorsal ae 
SG s somewhat older ee analis, two aay after hatching 
A ment ; x 68. Fig. 39, Atherinopsis californiensis, after the yolk 
sorbed; Jan 9, 1889; X12. Fig. 40, Stolephorus ringens, 
after hatching ; ; no color is formed in the latest stages observ 
Hemis rosæ, 12.5 mm. long, showing the distribution $ of the 
- m the cells of the posterior part of the body and of the 
