Ramsey, Optic Lobes of Amblyopsis. 47 
7. Optic tracts. 
7a. Optic tract region, 
8. Optic lobe cut so that it shows but layers 1 and 2. 
g. Nucleus opticus lateralis. 
10. Epithalamus. 
11. Posterior commissure. 
12. Hypophysis. 
13. Ependyma. 
14. Inferior lobe. 
15. Torus longitudinalis. 
16. Ventricle. 
PLATE III. 
Fig. z. Dorsal view of the brain of Amblyopsis speleus Dekay. Photo- 
graph of a dissection of head of a specimen 100 mm. long (2.8). 
fig. 2. Photograph of the head of Amblyopsis 35 mm.long (X about 16.3) 
cleared in xylol. To show the degree of degeneration of the eyes. 
PLATE. LV: 
Fig. 3. Dorsal view of the brain of a specimen of A. speleus 100 mm. 
long (X7.7). 
Fig. 4. Ventral view of the brain of a specimen of A. speleus 85 mm. 
long (XII.2). 
fig. 5. Dorsal view of the brain of a specimen of Campostoma anoma- 
lum, 85 mm. long (7.7). 
Fig. 6. Cross section of brain of C, anomalum near the anterior portion 
of the optic lobes (X24.5). Specimen 75 mm. long. 
fig. 7. Cross section of the brain of A, speleeus in the same relative posi- 
tion as the section in Fig. 6 (X37). Specimen 77 mm. long. 
Fig. 8. Cross section of the brain of A. spelzus through the middle of 
the optic lobes (X52.5). Specimen 77 mm. long. 
