i86 



ZOOLOGY 



SECT. 



■mifo 



OSt. t 



9.TTV 



rnesf 



dL-'.nvee 



mes. f 



d.7nes 



Fig. 137. — Tealia crassicornis. A, dissected specimen ; Si, transverse section, the half 

 above the line ab through the gullet, the lower half below the gullet.- d. mes. directive 

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

 mes. 2, secondary, mes. 3, tertiary mesenteries ; mes. f. mesenteric filaments ; mth. mouth ; 

 ost. 1, ost. 2, ostia ; p. m. parietal muscle ; $gx>h. siphonoglyphe ; s. i». sphincter muscle ; t. m. 

 transverse muscle. 



