REPORT ON THE ANTIPATHARIA. 



47 



tentacle opens into the general portion of the ecelenteron, the mesenteries on each side of 

 the sagittal axis become further separated, so as to take up more of a transverse position, 

 on account of the relatively large area of the base of each tentaclo. 



The gonozooicls are indistinctly divided into two lobes by a median depression 

 which corresponds in position to a mesentery. The surface of each lobe is continued 

 vertically as a tentacle. Apparently only one mesentery is present in each gonozooid, 

 occupying the transverse axis, and probably to be regarded as homologous with the 

 distal portion of a transverse mesentery in Parantipathes. It bears the reproductive 

 organs, which occupy the greater portion of the cavity of the zooid, and also at its 

 base forms a convoluted filament. All the individuals on a branch are in communication 

 with one another by means of a prolongation 

 of their ccelentera, passing from one zooid to 

 another between the base of the filament, or 

 the stomodseum as the case may be, and the 

 tissues surrounding the sclerobasic axis. The 

 individual zooids are separated from one 

 another by incomplete mesoglceal septa pass- 

 ing vertically downwards. They are appar- 

 ently slightly longer between adjoining gonozooicls than between a gonozooid and a gas- 

 trozooid (fig. 11). In other words, the individual members of each group of three zooids 

 are not quite so much isolated from each other as they are from the adjoining groups. 

 This difference is, however, slight, and is only noticeable in sections. 



FlG. 11. — Diagram of the arrangement of the dimorphic 

 zooids along the branches in Schizopathes crassa. 



Bathypathes. 



The zooids of this genus do not call for special comment at present. They are 

 similar in outline and in the arrangement of mesenteries to those of Schizopathes. 

 The individual zooids are, however, always isolated. 



Cladopathes. 



This genus is in many respects the most remarkable yet examined. The gastro- 

 zooids have an unusually long stomodseum, ending in a funnel-shaped opening close 

 to the base of the zooid. The mesoglcea is very thick, and has a number of connec- 

 tive tissue cells imbedded in its substance. This is the only case with which I am 

 acquainted in which the mesoglcea of the Antipathidse shows any cellular elements im- 

 bedded in its substance. In Cladopathes plumosa the stomodseum is much folded, 

 leading apparently to an irregular arrangement of the mesenteries. I have only been 

 able to make out six mesenteries, all of which are " primary," and correspond to the six 

 primary mesenteries of other Antipathidas. If any " secondary " mesenteries be present 



