ii6 Natural History Bulletin. 



extent, or those attached to opposite mesenteries may meet in 

 the center of the caHcle. 



The ova, in the specimens examined, seem to have under- 

 gone segmentation. No germinal vescicle or dot could be 

 seen, but a well defined peripheral layer of cells was dis- 

 tinguishable. It appears that the segmentation is regular and 

 the stage figured seems to be that of a solid morula which has 

 become differentiated into epiblast and hypoblast by a process 

 of delamination, as is usually the case among Alcyonid^ 

 according to Balfour.' 



Fig. 4, PI. II, represents a structure found in this species 

 which I am at a loss to interpret correctly; c, represents the 

 point where the retractor muscle, a, joins the bottom of the 

 gullet; b, is a mass of deeply stained tissue in which the out- 

 lines of globular bodies can be indistinctly discerned. Scat- 

 tered through the mass are a number of intensely black dots, 

 the number of which seems to correspond to the number of 

 globular bodies before mentioned.^ Whether this structure is 

 simply a part of a mesenterial filament or a mass of young 

 ova, I could not determine. The black dots are more intensely 

 black than any nuclei or germinal dots that I have ever before 

 seen. The position of the structure is that usually occu- 

 pied by ova, as it is situated along the free inner edge of the 

 retractor muscle. 



I will add that this structure appears in several sections 

 which I have of the species under consideration, and so is 

 probably not abnormal to the species. 



CcENENCHYMA. Under this head will be described all those 

 structures found outside of the calicles and inside of the gen- 

 eral ectodermal investment of the zoanthodeme, with the 

 exception of the axis cylinder.^ 



1 "In the Alcyoxid.e the segmentation appears always to lead to the forma- 

 tion of a solid morula, which becomes a planula bj delamination." Compara- 

 tive Embryology, p. 138. 



2 This is true only in the section figured and not of several others examined. 



3 See definition of terms, p. 98. 



