Fig, 2. 
Fig. 3. Fig, 4. 
Fig. 2. Salmo purpuratus, Anterior portion of a living embryo with 30 
somites, 22 days old. Letters and figures the same as in Fig. 1. 60 diameters. 
Fig. 3. Salmo purpuratus. Anterior portion of a living embryo with 35 
somites, 23 days old. Dorsal view. Letters and figures the same as in Fig. 1. XX 60 
diameters. 
Fig. 4. Salmo fario, Anterior portion of a living embryo with 55 somites, 
38 days old, Right profile view. 1, 2, 3 etc. neural segments; po. com. posterior com- 
missure; ep and ep! epiphysial vesicles. >< 60 diameters. 
