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. 



acet. lum. acetabular lumen. 



acet. op. acetabular opening. 



acet. sphinc. acetabular sphincter. 



ant. br. comm. anterior bridge commissure. 



ant. lat. n. st. anterior lateral nerve stem. 



can. op. canal opening. 



in. long. inner longitudinal muscle. 



in. mer. inner meridional muscle. 



in. trans. inner transverse muscle. 



out. circ. outer circular muscle. 



out. long. outer longitudinal muscle. 



out. mer. outer meridional muscle. 



out. trans. outer transverse muscle. 



rad. fib. radial fibre. 



ros. sphinc. rosette sphincter. 



sphinc. sphincter. 



test. testis. 



[452] 



