PLATE 40. 



Fig. 43. G. fimbriata, sagittal section. To show structure of aceta- 

 bulum and attachment of inner longitudinal muscles. Borax-carmine, 

 Lyon's blue. X 100. 



Fig. 44. Diagram, showing musculature of canal opening. 



Fig. 45. Same as fig. 43, showing detail of acetabular sphincter. 

 X 430. 



tint, htm. — acetabular lumen. 



acet. op. — acetabular opening. 



act t. sphinc. — acetabular sphincter. 



ant. br. comm. — anterior bridge commissure. 



ant. lat. n. St. — anterior lateral nerve stem. 



can. "i>. — canal opening. 



in. long. — inner longitudinal muscle. 



in. mi r. — inner meridional muscle. 



in. trims. — inner transverse muscle. 



out. circ. — outer circular muscle. 



out. long. — outer longitudinal muscle. 



out. nu r. — outer meridional muscle. 



out. trans. — outer transverse muscle. 



rod. fib. — radial fibre. 



ros. sphinc. — rosette sphincter. 



sphinc. — sphincter. 



test. — testis. 



[452] 



