THE GONOPHORES OF DISTICHOPORA AND ALLOPORA. 191 



Only male specimens of Stylaster densicaulis were ob- 

 tained. Each male ampulla contains two or three ovoid gono- 

 phores, which are attached to large offsets of the ccenosarcal 

 meshwork at one end of their longer axes. They have an 

 internal spadix, and in finer structure seem to differ very 

 little from the male gonophores of Sporadopora. 



Moseley also describes the male gonophores of Allopora 

 profunda, and remarks that they are very similar to those of 

 Sporadopora. He does not figure the seminal duct of this 

 genus. 



Only one male specimen of Astylus subviridis was exa- 

 mined by Moseley. "The male gonophores appear as large 

 rounded lobulated masses resting within the ampullar sacs, 

 and springing from stout offsets of the ccenosarcal meshwork, 



which pass into the sacs to reach them The sac as 



it enlarges becomes gradually pedicellate, and, when mature, 

 is attached to the central mass by a narrow pedicle of some 

 length. The walls of the pedicle are continuous with the 

 ectodermal wall of the sac, which wall contains well-developed 

 nuclei in its substance. Within the sac of the lobule a second 

 sac, composed of a finer membrane, encloses the mature or 

 developing generative elements. The wall of this inner sac 

 is not prolonged into the cavity of the pedicle, but, passing 

 across its commencement, shuts off the main cavity of the 



lobule from this latter No rounded spadix, such as that 



occurring in Allopora, is present in the interior of the lobules." 

 These gonophores seem, from the figures and the description 

 given, to be very similar to those of Distichopora. 



It is not at all probable that Moseley overlooked the spadix, 

 for in his figure there are represented no fewer than seven 

 gonophores; and he remarks that his material was in a good 

 state of preservation. The " inner sac " of the gonophore that 

 he mentions and figures is most probably the same as the 

 inner endodermic lining that I have described in both 

 Allopora and Distichopora. It would be certainly very re- 

 markable if this membrane is not attached to the endoderm 

 of the pedicle in Astylus, but this point can only be deter- 



