PLATE 46. 



Fig. 76. Gyrocoiiilc fimbriata. Median sagittal section, posterior ex- 

 tremity. Showing funnel, canal, funnel-opening, canal opening and sec- 

 tions of the ring commissures of the nervous system of the posterior 

 extremity. X 100. 



Fig. 77. Same, to left of median. Reconstruction of five sections, 

 showing lateral view of nervous system. Faint dotted lines indicate 

 course of nerves as shown in the neighboring sections; heavy dotted lines 

 indicate position of funnel with reference to the central nervous system. 

 X 100, 



can. op. — canal opening. 



ex. can. — excretory canal. 



lat. anast. — lateral anastomosis. 



lot. long. conn. — lateral longitudinal connective. 



post. hr. comm. — posterior bridge commissure. 



post. gang. Jen. — posterior ganglion knot. 



pro.r. r. comm. — proximal ring commissure. 



ros. n. st. — rosette nerve stem. 



ros. r. comm. — rosette ring commissure. 



ros. spliinc. — rosette sphincter. 



//'. — tope. 



[464] 



