THE GONOPHORES OF DISTICHOPORA AND ALLOPORA. 385 



In Pliobothrus symmetricus the male gonophores are 

 sacs containing a number of small ovoid bodies, which contain 

 spermatozoa, or sperm-cells, in various stages of development. 

 The exact structure of these smaller bodies and their relations 

 to the endoderm were not determined. 



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 coenosarcal 

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

 internal spadix, and ia finer structure seem to difi'er very 

 little from the male gonophores of Sporadopora. 



Moseley also describes the male gonophores of All op or a 

 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 rouuded 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 Disti- 

 chopora. 



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 



