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 olfactor}-- 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. From Cajal. 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 



loi. 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 Furbringer 193 



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



nerve in Lampetra 195 



