508 ALLIS. [Vou. II. 
ward, and ends about opposite the anus. The different’ series 
of organs, after the third, lie one behind the other on the second 
or third scale from the middle line of the body, or on the sec- 
ond scale from the base of the dorsal fin ; and there is normally 
a series on each row of scales, the rows corresponding to the 
scales of the lateral line. The series or lines in front of the 
dorsal fin are transverse to the body, while those along either 
side of it are longitudinal. 
In 55-millimetre specimens the different lines or series of the 
dorsal line, as well as those of the accessory lateral line, are stil} 
represented by single organs (Figs. 12 and 13, Pl. XXXIV.). 
In both Lepidosteus and Polypterus the canal of the lateral 
line extends to the tail fin; and in both there seem to be, from 
the descriptions given by Solger (No. 14, pp. 368 and 369), 
series of organs corresponding to the pit lines of the body in 
Amia. In neither form are the organs themselves described, 
but their distribution, as indicated by well-marked furrows, is 
fully given. In Lepidosteus the furrows are transverse, as they 
are in Amia; and there are only two series, one on the back 
extending as far as the dorsal fin, and the other accompanying 
the lateral canal, and extending as far as the tail fin. The fur- 
rows of this last line lie, as in Amia, just in front of the pores 
of the lateral canal, and they are found on about one-half the 
scales of the line. 
In Polypterus the furrows are longitudinal. The dorsal series 
extends as far as the tail fin, and a number of irregularly scat- 
tered furrows lying below the lateral line and immediately be- 
hind the pectoral fin represent what Solger considers a ventral 
series, not found in Amia. A third series of furrows is found 
on the scales of the lateral lines, but it is impossible to tell from 
Solger’s description whether they represent lines of pit organs 
or the lateral canal itself not fully inclosed. Each furrow cuts 
through the hind edge of the scale on which it lies, and they 
are found on nearly every scale of the line. Immediately above 
them there is a series of depressions, which differ somewhat in 
appearance from the furrows of the lateral line while they closely 
resemble the transverse furrows in Lepidosteus. They doubt- 
less represent the accessory lateral line of Amia. 
In Fierasfer also there are several lines of organs which seem, 
from the descriptions given by Emory (No. 5, p. 40), to corre- 
