470 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Mature gonothecae within this layer have a zone of degenerating, ill 

 defined, columnar cells, whose fate I have not followed. The ectoderm 



was also found undergoing ret- 

 rogressive change while the 

 sperms were nearing maturity. 

 It would seem probable that 

 the entoderm furnishes nour- 

 ishment for the spermatic layer 

 from its own substance at this 

 stage, while at an earlier period 

 of growth it passes food onward 

 from the central cavity to it. 



There are minor points of 

 structure which require to be 

 reconciled with Allman's de- 

 scription of Campanularta 

 insignis. He gives the height 

 of large colonies as nine inches. 

 Although I found none having 

 more than half that height, 

 this is so variable a feature 

 that it should have little 

 weight. The rim of the hy- 

 droid is described by Allman 

 as narrow and more transpa- 

 rent than the rest. In his plate 

 it is represented by a line 

 parallel to and just below the 

 edge. My collections show the 

 extreme border of the hydranth 

 set slightly inward from the 

 general surface. Two or three grooves may appear encircling the 

 hydrotheca, but the top one may occasionally be lacking. 



Allman places his species only provisionally in the genus Campan- 

 ularia because of lack of gonosome. The character of the gonosome 

 as described above settles the question of genus, placing the hydroid 

 among the Campanularia. 



Figures 11,12. Campanularia in^ignts. 



Figure 11. Young colony growing from 

 a stolon (X 4). 



Figure 12. One of the types of gono- 

 theca, sex undetermined (X 40). 



Genus CLYTIA Lamouroux (in part), 1812. 

 Clytia fragilis (new species). Figure 13. 



The hyaline colonies of Cltjtia fragilis occur in company with 

 Halecium bermudense on Pennaria tiarella. 



