444 



Mr. J. H. Ashworth. The Stomodceum, 



for the greater part of their length are bound together in bundles of 

 about forty to sixty, each bundle forming one stem of the colony. 



The polyp, or, more correctly, the free portion of the polyp, is 

 5 mm. to 7'5 mm. long, and bears eight tentacles, each 4 mm. to 

 5'4 min. long. 



Fig.i 



FIG. 1. Semidiagrammatic view of one-half of a polyp which lias been cut along 

 the dorso-ventral line. Only the bases of the tentacles are shown, x 20. 



FIG. 2. Transverse section through the lower third of the stomodseum (about the 

 level of reference line F in fig. 1). x 80. DF, dorsal meseuterial filament 

 on the edge of the dorsal mesentery ; F, flagella of siphonoglyphe ; Q-, gland 

 cells of stomodzeum ; LM, lateral mesentery (mesenterial filament absent) ; 

 M, mouth ; Sp, siphonoglyphe ; St, stomodseum ; T, tentacle ; VM, edge of 

 ventral mesentery (mesenterial filament absent) . 



The stomodseum of each polyp is 1'8 mm. to 2'2 mm. in length. 

 It has a well marked ventral groove or siphonoglyphe, the cells of the 

 lower third of which bear long flagella. Many of the cells of the 



