AUTHORS’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, APRIL 20 
THE PERIPHERAL TERMINATIONS OF THE NERVUS 
LATERALIS IN SQUALUS SUCKLII 
SYDNEY E. JOHNSON 
From the Anatomical Laboratory of Northwestern University Medical School 
TEN FIGURES 
The observations set forth below supplement the writer’s 
previous paper on the structure and development of the lateral 
canal sense organs of Squalus acanthias and Mustelus canis.? 
In the investigation referred to the peripheral terminations of the 
lateral nerve were demonstrated in Mustelus canis, but not in 
Squalus acanthias, as fresh specimens of the latter species were 
unobtainable at that time. Last summer (July, 717), while at the 
Puget Sound Biological Station, I secured a number of living 
specimens of the Pacific coast’ dogfish, Squalus sucklii, which 
appears to be practically identical to the Atlantic form, Squalus 
acanthias. The histological structure of the lateral sense organs 
of these specimens was examined and the peripheral terminations 
of the lateral nerve were demonstrated by the pyridine silver 
method and also with methylene blue. These observations 
supply the omission which was necessitated in the paper referred 
to above. 
The papers which deal specifically with the peripheral termina- 
tions of the nervus lateralis and which are of more than historic 
value are those of Retzius 792, v. Lenhossék ’92, Bunker ’97, 
Heilig 12, and Pfiiller °14. They are discussed briefly in the 
writer’s previous paper and need no further comment except to 
say that most attempts to stain the peripheral terminations of 
the lateral nerve have heretofore yielded rather meagre results. 
1 Contribution No. 60. 
2 Jour. Comp. Neur., Vol. 28, No. 1. 
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