136 



ZOOLOGY 



SECT. 



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

 above the line ab thnm^li tlie y""'- 1 ^ the lower half below the gullet.- <i. mes. directive 

 mesenteries; r/on. gnnads ; <n<i. gullet ; /. //;. longitudinal muscle; Ip. lappet; mcs. 1, primary, 

 me.?. 2, secondary, mcs. 3, tertiary mesenteries; mix. /. inesenteric filaments; milt, mouth ; 

 ost, 1, ost. 2, ostia ; p. m. parietal muscle ; syph. siphonoglyphe ; s. n>~ sphincter muscle ; t. m. 

 transverse muscle. 



