No. 2.] LATERAL LINE IN EXTINCT AMPHIBIA. 517 
mal, apparently adult. It measures 49 millimeters in length 
or a little less than two inches. It is preserved, almost per- 
fectly, in one of the nodules from Mazon Creek, Grundy 
County, Illinois; the collector in splitting the nodule lost the 
chips containing the hands and feet. From this specimen not 
a few new characters have been added to those already known 
for the Branchiosauria such as certain color markings on the 
body, the character of the dermal covering, and most important 
of all, the presence of a distinct type of lateral line preserved 
clearly and distinctly on the impression of the fleshy tail. This 
Fic. 4—Impression of Micrerpeton caudatum Moodie, from the Car- 
boniferous of Illinois. Twice natural size. 
has been fully described elsewhere, but it is deemed of such 
importance that a redescription is here given. 
“The most interesting and important single structure dis- 
covered on the specimen is the impression of the lateral line 
system which is clearly evident as two dark lines on the impres- 
sion of the fleshy part of the tail. The sense organs are 
represented by two longitudinal rows of pigmented scales. 
one beginning at the tip of the tail, the other taking its origin 
from the median line somewhat further forward (Fig. 5). 
I am indebted to Dr. Takahashi for calling my attention to the 
similarity of this arrangement to that found in ti.: modern 
