46 
mandibular, and runs mesially and slightly backward, the hollow of its 
slight curve presented backward. 
The Lateral Line of the Body is represented by a series of 
sensory patches occupying short linear depressions on the outer sur- 
faces of certain of the scales. Whether each of these patches re- 
presented a single organ, or a group or patch of organs similar to 
those found in the lateral canals of the adult Amia, or a series of 
separate organs resembling the organs of the pit lines of Amia, was 
not investigated. : 
The first sensory patch of the lateral line is found on a scale 
that lies immediately posterior to pore 14 infraorbital. This scale lies 
in the first row of scales posterior to the posttemporal bone, and was, 
on the left side of the 44-cm specimen, the eighth scale in this row 
counting downward and backward from a scale that occupies a mid- 
dorsal position immediately posterior to the line of supratemporal bones. 
The second sensory patch on the same side of this same specimen oc- 
cupied a depression on a scale lying directly and immediately posterior 
to the first scale. This second scale belonged to the second row of 
scales posterior to the posttemporal bone, and was the seventh scale 
of the row counting downward and backward from the mid- dorsal 
scale. 
The third sensory patch of the line occupied a depression on a 
scale of the third row of scales posterior to the posttemporal bone, 
but the sensory line here dropped ventrally one row of scales; that 
is, the third scale of the lateral line, although lying in the third row 
of scales, was the first scale ventro-posterior to the one that lay 
immediately and directly posterior to the second scale of the line. 
It was, however, the seventh scale in its row, counting downward and 
backward from the mid-dorsal scale, thus occupying, numerically, the 
same position in its own row that the second scale of the line did in 
its row. f 
The fourth, fifth, and sixth sensory patches lay on the same level 
as the third patch, and in succeeding and consecutive rows of scales, 
each of these lateral scales being the seventh scale in its respective row. 
The seventh sensory patch lay on a scale of the same row as the 
sixth patch, lying on the first scale, of this row, ventro-posterior to 
the one on which the sixth patch lay. It thus lay on the eighth scale 
of the sixth row. 
The eighth and ninth patches lay on the same level as the seventh | 
patch and on succeeding and consecutive rows of scales, each lateral — 
scale being the eighth scale of its row. 
