136 



ZOOLOGY 



SECT. 



c&t. 1 



ct.rttes 



B 



mes. / 



mes.1- 



m.ts.2 



d mes 



FIG. 137. - Tealia crassicornis. A, dissected specimen ; B, transverse section, the half 

 above the line ab through the gullet, the lower half below the gullet. </. >/<<.>. directive 

 mesenteries ; rjon. gonads ; gul. gullet ; /. m. longitudinal muscle ; I p. lappet ; mes. 1, primary, 

 mes. 2, secondary, mes. 3, tertiary mesenteries; mes. f. mesenteric filaments; nit It. moutii ; 

 ost. 1, ost. 3, ostia; p. HI. parietal muscle ; xyph. siphon'oglyphc ; s. HI. sphincter muscle ; t. m. 

 transverse muscle. 



