484 LICHENOPORID^. 



growths^ superimposed one upon another^ and at length 

 divides dichotomously into distinct cylindrical branches, 

 which, again, may subdivide into a number of short ter- 

 minal lobes (Plate LXIII. fig. 11). The successive incre- 

 ments to the stem and branches are clearly indicated by 

 transverse grooves on the surface. Not unfrequently the 

 capitula are rounded and slightly furrowed on the upper 

 part, but show no traces of the celliferous lamellae ; this is 

 probably an immature condition, and it closely resembles 

 that which is permanent in D. truncata. 



The Corymbopora fungiformis of Smitt is probably 

 founded on a simple specimen of the elongate form in an 

 imperfectly developed state (Plate LXIII. fig. 13). 



I am indebted to Mr. Peach for the opportunity of 

 examining a very fine series of specimens, which fully 

 illustrate the various stages of growth and diversities of 

 habit. 



Habitat. On stones, shells, Serpulce, &c., from deep 

 water. 



Localities. Zetland, deep water (Fleming, Peach) : 

 ibid., not u^ncommon on the Outer Haaf, in 70-1 70 fa- 

 thoms (A. M. N.). 



Geographical Distribution. Norway (Rasch) : ibid., 

 from Bergen to Bejan, 40-60 fathoms (Sars). 



Range in Time. " In stratis arenoso-margaceis West- 

 phalice " (Goldfuss) : Austro- Hungarian Miocene (Man- 

 zoni) : Vienna basin (Reuss) . 



