382 J. B. JOHNSTON 
Figs. 14-22. Lampetra. Nine sections of the habenular and hippocampal 
region drawn from a series of horizontal sections prepared by the Golgi method. 
The figures were drawn at a magnification of 200 diameters and are reduced to one- 
third. Figure 22 is at a somewhat lower magnification. 
Fig. 14 The first section through the dorsal part of the left primordium hippo- 
campi. The section shows the epiphysis and its stalk. The four fibers in the left 
nucleus habenulae come from the parapineal body. The bundle s.m.1 is the first 
part of the stria medullaris of which it is uncertain whether it is a tractus olfacto- 
habenularis or tractus cortico-habenularis. 
Fig. 15 The second section of the same series. The first bundle of the stria 
medullaris is passing through the left nucleus habenulae. 
