THK :\rAM)lBULAR AND UYOLD MUSCLES OF MAMMALS. 
zycfo. maud. m. Zygoimitico-niandiljul.iris muscle. Roman numerals. 
Cranial nerves. 
D a s y ii r us v i v e r r i in u s , figs. l-'28. 
Figs. 1-0. — From transverse sections, stage A (just Ijorn ; greatest 
lengtli, in spirit, 5'5 mm., head length 2'5 mm.) ; fig. 1 is the most 
anterior. Fig. 1, slide 1, row 1, numlier 17 ; fig. 2. s. 1, r. 7, n. S ; fig. o, 
s. 1, r. 8, n. 12. 
Fig. 4. — From transverse section, stage B (few hours old; greatest 
length 5’75 to (> mm. head length 3 mm.) ; the section is a little ohli([ue 
and the right side is anterior to the left ; s. 2, r. 1, n. 1. 
Fig. 5. — Portion of transverse section, stage B ; s. 2, r. 1, n. 20, 
showing undifferentiated mesoderm between posterior digastric muscle 
and epiblast. 
Figs. 6-lU. — From sagittal sections stage C (twenty-si.x; hours old; 
greatest length 6 mm. head length 3"25 mm.) ; fig. (> is the most anterior. 
Fig. 6, s. 1, r. 2, n. 1 ; fig. 7, s. 1, r. 3, n. 6 ; fig. 8, s. 1, r. 4, n. 1 ; fig. 0, 
s. 1, r. 4, n. 7 ; fig. 5, s. 1, r. 5, n. 9. 
Fig. 11. — From transverse section stage C ; s. 2, r. 2, n. 15. 
Fig. 12. — Portion of transverse section, stage C, s. 2, r. 3, n. 8, showing 
stapedius muscle. 
Fig. 13. — Portion of transverse section, stage C, s. 2, r. 4, n. II, 
showing Anlage of sphincter profundus and platysma muscle. 
Figs. 14-18. — From transverse sections, stage D (probably three d:iys 
old ; greatest length 7 mm., head length 4 mm.) ; fig. 14 is the most 
anterior. Fig. 14, s. 1, r. 8, n. 1; fig. 15, s. 1, r. 8, n. 9 ; fig. 16, s 1, r. 8, n. 13; 
fig. 17, s. 2, r. 1, n. 3 ; fig. 18, s. 2, r. 2, n. 4. 
Fig. 19. — Portion of transverse section, stage D, s. 2. r. 3, n. 12, 
showing stapedius muscle. 
Figs. 20, 21. — From transverse sections, stage E (5 or 6 days old ; 
greatest length 8 mm., head length 4‘5 mm.) ; fig. 20 is the more anterior ; 
Fig. 20, s. 2, r. 4, n. 12 ; fig. 21, s. 2, r. 5, n. 5. 
Figs. 22, 23. — From transverse sections, stage F (about 7 days old; 
greatest length 8’5 to 9 mm., head length 5 to 5‘5 mm.) ; fig. 22 is the 
more anterior. Fig. 22, s. 2, r. 8, n. lO; fig. 23, s. 3, r. 2, n. 13. 
Figs. 24-27. — From transverse sections, stage H (about 14 days old; 
greatest length 13’5 mm., head leiigth 8 to 8‘5 mm.) ; fig. 24. is the most 
anterior. Fig. 24, s. 5. r. 3,n. 10 ; fig. 15, s. 5, r. 5, n. 2 ; fig. 26, s. 5, r. 6, n. 8; 
fig. 27. s. 6. r. 2, n. lO. 
Fig. 28. — From transverse section, stage J (25 days old; greatest 
length 20 mm., head length 12’5 mm.) ; s. 3, r. 2, n. 5. 
