n6 



MANUAL OF ZOOLOGY 



communicating with the exterior by the mouth, and open- 

 ing below into (2) a single main digestive cavity, the 

 stomach, which gives off (3) a number of radially-arranged 

 cavities, the inter-mesenteric chambers. The free edges of 

 the mesenteries below the gullet are produced into curious 



i-nth- 



. 1 



FIG. 52. Tealia crassicornis. Dissected specimen ; gon. gonads ; gu.. gullet ; 

 /. in. longitudinal muscle ; Ip. lappet ; tnes. /, primary, ntes. 2, secondary, 

 ines. 3, tertiary mesenteries ; tries, f. mesenteric filaments ; inth. mouth ; 

 ost. /, ost. 2, ostia or aperture in mesenteries ; /. ;;/. parietal muscle ; sgph. 

 siphonoglyphe ; s. in. sphincter muscle ; /. ;//. transverse muscle. 



twisted cords, the mesenteric filaments (ines. /.), answering 

 to the gastric filaments of Scyphozoa. Stinging-capsules 

 occur in the ectoderm, and are also very abundant in the 

 mesenteric filaments. They resemble in general character 

 the nematocysts of Hydrozoa, but are of a more elongated 



