Primicorallina trentonensis Whitfield 



T'J Page 197 



1 One of the type specimens redrawn, to show the verticillate 



arrangement of the branchlets of the second order at a and 

 those of the third order at b 



2 Restoration of a thallus 



Trenton limestone, Middleville, N. Y. 



Callithamnopsis fruticosa (Hall) 



Page 201 



3 One of the type specimens redrawn to show the apex of the 



main branch and the articulation of the branchlets at the 

 division points and the paired arrangement of those of the 

 first order 



4 A specimen on the same slab with the types, exhibiting the 



twisting of the bifurcating main branches 

 Trenton limestone, Platteville, Wis. 



Callithamnopsis delicatula sp. nov. 



See plate 2, figure 1 

 Page 203 



5 Large fragment of thallus showing- the segmentation, the alter- 



nate contractions and expansions of the branch and the verti- 

 cillate arrangement of the branchlets 

 Trenton limestone, Glens Falls, N. Y. 



Originals of figures I, 3, 4 in the American Museum of Natural 

 History, that of figure 5 in the New York State Museum 



212 



