A FURTHER CONTRIBUTION TO A KNOWLEDGE OF 
THE LATERAL LINE SYSTEM IN EXTINCT 
AMPHIBIA 
ROY L. MOODIE 
From the Department of Anatomy, University of Illinois, Chicago 
SEVEN FIGURES 
Since the publication of an earlier paper! on the occurrence 
of the lateral line organs in extinct Amphibia, in which was 
given a complete bibliography of the subject up to that time, 
there have been several interesting additions to our knowledge 
of these important organs as they occur among the primitive 
land vertebrates, in the remains which have so far been secured. 
These results are contained in contributions by Wiman (’14), 
Fraas (13), Williston and the writer (113), and have been briefly 
reviewed elsewhere.? It is the intention here to collect these 
observations into one place in an attempt to correlate the canals, 
as they occur in the extinct Amphibia, with what is known from 
the fishes, and to that end the work of MeMurrich (’84), Herrick 
CO1), Pfiiller (14) and others are noted; and the possible impor- 
tance of their results to the elucidation of the anatomy of the early 
land vertebrates is discussed. 
One of the most interesting observations on the occurrence 
of the lateral line organs in the extinct Amphibia has recently 
been given me by Doctor Williston, and I have his permission 
to use his results in this place. Among the Permian Amphibia 
of North America, there are three types of skulls exhibited. 
Many species show no trace of the lateral line canals on the skull, 
1 Jour. Morph., vol. 19, no. 2, pp. 511-540, figs. 1-17, bibliography, 1908S. 
* Amer. Nat., vol. 49, June, pp. 369-376, 1915. 
O17 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 25, No. 4, 
AuGtst, 1915 
