OF COENOPSAMMIA FROM LIFU. 



365 



Tentacles. The tentacles are all entocoelic, and their three orders con-espond 



to the orders of septa, the tertiaries being situated most externally on the mouth- 

 disc. The introverted tertiary tentacles form deep pockets in the entocoeles of the 



Figure II. Diagrammatical longitudinal section of a polyp, the left half passing through 

 the opening of a tertiary tentacle and exposing the face of a tertiary mesentery, and tiie 

 right half passing to one side of a primary mesentery exposing it likewise. 



A — F. Sections shown in Fig. I. 



th. Theca. .S'. /. and S. III. Primary and tertiaiy septa, col. Columella, i^th. Peritheca. 

 p. Perforating canals of the theca. e. tu. External body-wall. y. Ova. ;;. w. Body-wall of moutli- 

 disc. St. Storaodoeum. T. 1 and T. .3. Primary and tertiary tentacles retracted, m. Jilesenterial 

 filaments, m. r. Retractor muscle. i». s. Circular sphincter muscle. 



Left Half. The tertiary mesentery does not extend beyond the tertiary tentacle. Its 

 muscles are well marked and attached nearly along its whole length to the theca, arising 

 from the wall of the tentacle. Along the free edge a much convoluted filament is present 

 except at its upper and lower ends. The ridge of ci>ralluni, represented at its lower edge, 

 is not generally marked, and the mesentery does not reacii the base of the polyp. The 

 outline of a tertiary septum {S. Ill) is shown. 



Right Half. The lip rounfl the storaodoeum is well marked with a circular depression 

 around, having tlie opening of a primary tentacle ( 7'. 1 ), the position of wliich is shown 



W. IV. 50 



