REPORT ON THE ANTIPATHARIA. 39 



sagittal axis are apparently inserted at a somewhat lower level than the others. In hori- 

 zontal section the oral prominence is seen to include ten mesenteries, which are suboqui- 

 distant, but somewhat unequal in breadth (fig. 4). Those situated at each end of the 

 long axis of the mouth are shorter than the others. As in Leiopathes, after mesenteries 

 4 and 9 have been lost (fig. 2), two mesenteries, one on each side, correspond with 

 the transverse axis of the zooid. These are the mesenteries which, lower down, bear the 

 reproductive organs. The stomodseum is folded in such a manner that each mesentery 

 corresponds with a prominence, to which it is attached. The subsequent history of tin' 

 mesenteries is much the same as that of the corresponding ones in Leiopathes. The four 

 mesenteries which are situated two on each side of those occupying the transverse axis, 



Fig. 4. Fig. 5. 



Figs. 4 and 5. — Horizontal sections of Cirripathea propinqua, n. sp. 



Fig. 4.— Section through the upper portion of the oral cone, passing also through the six tentacles. 

 Fig. 5. — Section in a plane beneath the insertion of the sagittal tentacles. 



lose their connection with the peristome and subsequently become lost. Some time before 

 the base of the stomodseum is reached only the six primary mesenteries remain (fig. 5). 

 In this portion the walls of the stomodseum, in its middle section, are only separated by 

 a. slit-like space, but at each end the lumen is large and triangular. The transverse 

 mesenteries are here broadest, and the sections of the ccelenteron on each side of them 

 are almost filled, in the specimen examined, with a dense mass of ova. The two 

 mesenteries at each end of the mouth are relatively thick ; each passes from an angle of 

 the stomodasum to the body-wall, which, on account of the great elongation in the 

 stoniodseum, is not far away. The sections of the ccelenteron which they include form 

 the lumen of the sagittal tentacles. 



Antipathella. 



In this genus the shape of the zooid is subject to a variation which has a marked 

 effect on the arrangement of the tentacles. The zooids are usually small and con- 



