Boyrr. — Mesoderm in Teleosts. 
PLATE II. 
All drawings of this plate were made from transverse sections of one embryo 
of 72 hours. Embryo killed with Perenyi’s fluid, stained with Kleinenberg’s hema- 
toxylin, and mounted in balsam. Sections 744 in thickness. All drawings are 
magnified 310 diameters. The sections are : — 
Fig. 9. Through the anterior region of the auditory vesicle. 
Fig. 10. Through the middle region of the auditory vesicle. 
Fig. 11. Through the anterior region of the first protovertebra. 
Fig. 12. Through the posterior region of the first protovertebra. 
Fig. 15. Through the middle of the second protovertebra. 
Fig. 14. Through the middle of the fifth protovertebra. 
Fig. 14¢. Through the middle of the sixth protovertebra. 
Fig. 15. Through the posterior region of the seventh protovertebra. 
