OKISKANY FAUNA OF BECRAFT MOUNTAIN 63 



(?) Ptychonema helderbergiae Hall 



Seo Paleontology of New York. 6 : 15, pi. 9, fig. 16, 17 



Several specimens have been found which have a ramose stock 

 and attain the proportions of this species both in size of stock and 

 cell apertures. 



Vermipora streptocoelia, sp. nov. 



Plate 9, flg. 7, 8 



Eamose twigs of from 8 to 12 mm diameter are bundles of tubes 

 like those of Vermipora, but, instead of having a direct course out- 

 ward from their point of growth, as in the known species of the genus, 

 these tubes are exceedingly irregular, wandering about in serpentine 

 courses as they approach the termination, but appearing to be straighter 

 within the substance of the stock. The material illustrating this 

 peculiar form is not very favorably preserved, and the species will be an 

 interesting subject for farther study. 



Vermipora serpuloides Hall, var. 



See Paleontology of New York. 6 : 5, pi. 2, fig. 24-31 



Vermipora serpuloides of the Helderbergian differs from this 

 species in the smaller size and greater number of its tubules. The 

 colony is slender and branching. With better material it is probable 

 that this form would prove a distinct species. 



Cladopora smicra, sp. nov. 



Plate 9, flg. 3-6 



Small and sparsely branching colonies with stems from 3 to 5 mm in 

 diameter, bearing small, very oblique cells in 6 to 8 vertical rows. The 

 apertures of these cells are much compressed, the upper surface being 

 broadly arched and the under surface being more or less excavated in 

 the substance of the stock. On the older parts of the stem the cells 

 are reduced in form to scales covering circular pits. The species is 

 distinguished from Clad, styphelia by its slender form and much 

 less conspicuous cells. The species exists also in the Onondaga limestone 

 of western New York. 



