184 



ZOOLOGY 



SECT, 



B 



mes. / 



mes. 3 



FIG. 138. Tealia crassicornis. A, dissected specimen ; B, transverse section, the half 

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

 mesenteries ; gon. gonads ; gul. gullet ; l.m. longitudinal muscle ; Ip. 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 ; sgph. siphonoglyphe ; s.m. 

 sphincter muscle ; t. m. transverse muscle. 



