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Fic. 232.— Frontal section through the base of the tail of a chick 
embryo of 96 hours. The anterior end of the section (above 
in the figure) is at a higher plane than the posterior end. 
caud. Sel., Caudal division of the sclerotome. ceph. Sel., Ce- 
phalie division of the sclerotome. Derm., Dermatome. Ep., Epi- 
dermis. Gn., Ganglion. int’s. F., Intersomitic fissure. int’v. F., 
Intervertebral fissure. My., Myotome. N’ch., Notochord. N. Rs 
Neural tube. per’ch. Sh., Perichordal sheath. s. A., Segmental 
artery. 
413 
