Houser, Zhe Neurones of a Selachian. 169 
’95. Beitrage zur Anatomie und Entwicklungsgeschichte des Vorder- 
hirn der Cranioten. Abth. 1. Sttzungsb. d. konigl. bochmisch. Gesell. 
a. Wissensch.; Math.- Nat. Classe, No. 33, S. 1-42. 
’98. Noch einige Worte zu meinen Abhandlungen iiber die Anatomie 
des Vorderhirns. Amat. Anzeig., Bd. 14, S. 561-568. 
SZCZAWINSKA, W. 
798. Recherches sur le systéme nerveux des Sélaciens. I. Structure des 
cellulés nerveuses. Archives de Biologie, T. 15, p. 463-509. 
THORNDIKE, E. L. 
’99. A Note on the Psychology of Fishes. Amer. Naturalist, Vol. 33, 
PP- 923-925. 
VERATTI, E. 
’97. Ueber einige Structureigenthiimlichkeiten der MHirnrinde den 
Sadugethieren. Anat. Anzetg., Bd. 13, S. 379-389. 
VERWORN, Max, 
1900. Das Neuron in Anatomie und Physiologie. /ena. 
VIAULT, FR. 
776. Recherches histologiques zur la structure des Centres nerveux des 
Plagiostomes. Archiv. de Zool. expér. et gen., T. 5, p. 441-525. 
WARRINGTON, W. B. 
98. On the Structural Alterations Observed in Nerve Cells. /Jour. of 
Phystol., Vol. 23, pp. 112-129. 
WOLTERS, M. 
’90. Drei neue Methoden zur Mark- und Achsencylinderfarbung. Zestsch. 
f. wiss. Mikr., Bd. 7, S. 466-473.— 
SEcTION XI. DESCRIPTION OF THE FIGURES. 
All of the figures have been drawn with the aid of the camera 
lucida. A uniform scale of magnification could not be adopted be- 
cause of the wide range in the sizes of the neurones. In order that 
comparisons may be facilitated, the scale of diameters of the drawing 
as reproduced is given in the description of each figure. The orienta- 
tion is accurately maintained in all of the drawings, the dorsal parts 
being uppermost as the figure appears on the plate. 
REFERENCE LETTERS. 
a. f.—Ascending fibre 
a. l. f.—Acustico-lateral fibre 
aq.—Aqueduct of SYLVIUS 
ar,—Terminal arborization 
as, 2,—Associative néurone 
