FOSSIL HYDROZOA. 75 



like expansions of the polypary. Type of the order , Tubularia 

 (fig. 21). 



Two genera, viz., PalcBocoryne and Corynoides, have been re- 

 ferred to the Corynida, but in neither case is the reference free 

 from doubt. Palaocoryne (fig. 22) is a minute organism which 



Fig. 22. Palaocoryne radiatum, enlarged fifteen diameters. 

 (After Duncan and Jenkins.) 



was discovered by Dr Martin Duncan and Mr Jenkins grow- 

 ing attached to the margins of Lace-corals (Fenestellcz) in the 

 Carboniferous Rocks of Scotland. Its base is expanded, with 

 finger-like processes of attachment. From the base rises a 

 short robust stem, which is marked with flutings and super- 

 ficial granulations. The stem terminates in a single polypite, 

 the mouth of which is surrounded by a single whorl of slender 

 processes or " tentacles," in the centre of which is the mouth. 

 The entire polypary, as above described, is " calcareous, dense, 

 and ornamented." In one living form only (viz., Bimeria) is 

 the polypary continued along the tentacles and upper part of 

 the body of the polypite, and in this case the polypary is simply 

 of the consistence of parchment. This peculiarity, therefore, 

 with the possession of a calcareous polypary, renders the refer- 



