Haddon and Shackleton — Actiniae: I. Zoanthece. 701 



without enclosures of any kind. It is thrown into very slight plaitings to support 

 the longitudinal muscles, which are not well developed. The parieto-basal 

 muscles are also feebly developed. The endoderm of the mesenteries forms a thin 

 layer similar to that which lines the body- wall. 



Gonads. — No gonads were found in our specimens. 



Parasites. — We found that many of our specimens of this species were infested 

 by a copepod which deposits its egg in the coelenteron or coelenteric canals of the 

 polyp. The capsules are paired, and contain a large number of ova. We have 

 found them in the nauplius stage, as well as in other stages of development. We 

 have two specimens of the copepod, but are unable to say whether these are adult 

 or not. The capsules form distinct swellings of the body-wall of the actinian. 

 This fact leads us to suppose that the copepod remains within the coelenteric 

 cavities while the capsule is developing, and when the latter is ripe it breaks 

 away from it (PI. LXi., figs. 19—22). 



Small oval parasites, similar to those found in P. dichroicus, are also found 

 in P. macmurrichi. 



The larger size and uniform colouration of P. doiiglasi enable it to be easily 

 distinguished from P. dichroicus. 



TEAMS. KOr. DUB. SOC, N.S. VOL. IT., PAKT XIII. 5 1 



