May 24, 1901.] 
creatures, a series of seven spots placed at 
nearly regular distances along the middle of the 
side. The effect is precisely the same as if the 
seven spots were repeated on the two sides. 
In opaque animals the color markings of the 
two sides approach bilateral symmetry. Inthe 
present case the markings are strikingly asym- 
metrical in that there are three spots on one 
side and four on the other. This asymmetry in 
the number of spots on the two sides and their 
positions at irregular distances from each other 
makes it quite certain that their arrangement 
SCIENCE. 829 
OLDER SPECIMEN : 
12 12-13-14 R 
ib 24-95-96 L 
ie 36-37-38 R 
al 48-49-50 L 
3 58-59-60 R 
a 71-72-73 L 
87-88-89-90 R 
The two specimens differ structurally as fol- 
lows: 
A. Body more elongate than in 44; pectorals 
a mere ridge ; nostrils remote from each other 
<asyyn)]] ny ) 
el Ue / 
( « ( ( (¢ 
NIM 
ou opposite sides so as to alternate and form a - 
series at more or less regular intervals is not 
accidental but the normal condition, 7. e., a 
mutual adaptation in the location of the spots 
of the two sides. This adaptation of the two 
sides to each other is emphasized in the 
younger specimen where the first two spots 
are on the right side, leaving the first forty seg- 
ments of the right side without a spot. 
The following are the details of the distribu- 
tion of the spots on the somites, counting from 
the pectoral backwards : 
Number of the segments and 
the sides on which the 
spots occur. 
Number of segments between 
the centers of successive 
spots. 
YOUNGER SPECIMEN: 
12 15-16-17 R 
13 27-28-29 R 
11 40-41-42 L 
11 51-52-53 R 
14 62-63-64-65 L 
15 76-77-78 R 
91-92-93 L 
for a distance nearly equal to the diameter of 
the eye; leptocephalous teeth wanting; lower 
jaw projecting, its tip rounded and entering the 
profile; no pigment spots about the head; 
depth 83 in length, head distinctly more than 
half the depth of the body, nearly 11 in the 
length; eye 7 in head, 14 in snout; segments 
73 + 48. One specimen 51 mm. long. New 
Providence (type). 
AA. Body elliptical: pectorals well de- 
veloped: nostrils not yet separated: leptoce- 
phalous teeth: jaws nearly equal: a pigment 
spot near the end of the lower jaw, another 
within anterior nares, two succeeding each other 
between the lower margin of the pupil and the 
lower margins of the auditory capsule: depth 
6 in the length: head little less than half 
greatest depth: eye five in head: segments 
76 + 38. 
One specimen 38 mm. long. Albatross Sta- 
tion 2566. 
The Leptocephalus has not been referred to 
