XVI LIST OF ILLUSTRATIONS. 



FIG. PAGE 



from the pharynx of the same embryo; C, two neuromasts 



from the skin of the same embryo 165 



[86. A taste organ from the pharynx of the ammocoetes of Petro- 



myzon dorsatus 166 



87. A taste bud from the skin of an adult Lampetra 167 



88. A projection of the cutaneous branches of the communis root 



of the right facial nerve in a bony fish, Ameiurus. From 



C. Judson Herrick 168 



89. A parasagittal section through the brain of the spotted sucker, 



Minytrema melanops, to show the gustatory centers and 

 tracts. From C. Judson Herrick 170 



90. A diagram of the gustatory paths in the brain of the carp as 



seen from the left side. From C. Judson Herrick . . . . 172 



91. Part of a sagittal section of the brain of a newly hatched 



bony fish 173 



92. A diagram representing the centers and tracts related to the 



visceral sensory components in fishes 174 



93. A transverse section through the olfactory epithelium of a 



bony fish at the time of hatching 177 



94. An oblique section through the forebrain of Lampetra . . . 178 



95. A horizontal section through the olfactory bulb of the 



sturgeon 179 



96. A spindle cell and two granules from the olfactory bulb of 



the sturgeon 180 



97. An olfactory glomerulus from the brain of the sturgeon . . 181 



98. Cells with short neurites in the olfactory bulb. FromCajal. 182 



99. A transverse section of the forebrain of the sturgeon at the 



level of the anterior commissure 184 



100. An outline of the median sagittal section of the forebrain of 



Lampetra 185 



1 01. A diagram of the olfactory conduction paths in the sturgeon. 187 



102. A diagrammatic representation of the somatic motor compo- 



nents of a trunk segment 191 



103. An early stage in the formation of the pectoral fin and 



brachial plexus in a selachian, Spinax. After Braus ... 192 



104. The formation of the cervical plexus in a selachian, Hexan- 



chus. After Fiirbringer 193 



105. A transverse section through the nucleus of origin of the III 



nerve in Lampetra 195 



