48 PROCEEDINGS OF THE NATIONAL MUSEUM vol.87 



from which narrow elongate zooecia emerge at a low angle, then bend 

 almost at right angles, whereupon they themselves issue, alternately 

 to the right and left, rather long zooecial tubes, which remain 

 practically in contact. Length of zooecial tubes about 2 mm., width 

 0.3 mm., 2 to 3 in 5 mm. measured on the same side of a branch. 



Occurrence. — Upper Devonian (Tully limestone- West Brook mem- 

 ber): 2K miles south of Sherburne, N. Y. 



Holotype.—V.S.'NM. No. 87970. 



HEDERELLA GRACILIOR Clarke. 1900 



Plate 3, Figure 12 



Hederella gracilior Clarke, Mem. New York State Mus., vol. 3, No. 3, p. 62, 

 pi. 9, fig. 10, 1900. 



This species is evidently closely related to H. alpenensis, with which 

 it agrees in general arrangement of the tubes and method of branch- 

 ing (60° angle) but differs in that the zooecia are longer (1.5 mm.) 

 and wider (0.5 mm.) and sometimes exhibit an elongated central tube. 

 Branching occurs at intervals of 6 to 7 mm., with 3 to 3}^ zooecia in 

 5 mm. Only the type specimen is known, and additional material 

 may show further characters. 



Occurrence. — Oriskany sandstone: Becraft Mountain, near Hudson, 

 N. Y. 



Plastoholotype.—U.S.IS^.M. No. 87912. 



HEDERELLA EDWARDSI, new species 



Plate 4, Figure 7 



This new species, allied to H. alpenensis, differs in its more robust 

 characters. While the method of branching is similar (angle of about 

 30°), occurring at intervals of 6 mm., the tubes are much larger, being 

 2.5 mm. long and 0.6 mm. wide, with about 2 zooecia in 5 mm. and 

 budding at an angle of about 20°. The surface ornamentation is 

 more evident, and in general the tubes have a more irregular appear- 

 ance. The specific name is in honor or Dr. Ira Edwards, curator of 

 geology of the Milwaukee Public Museum. 



Occurrence. — Middle Devonian (Milwaukee Hmestone-Lindwurm 

 member): Milwaukee, Wis. 



Holotype.—U. S.^.M. No. 57531. 



HEDERELLA HALYSON (Fenton and Fenton. 1924) 



Plate 2, Figure 6; Plate 5, Figures 4, 5; Plate 12, Figure 1 



Hernodia halyson Fenton and Fenton, Strat. and Fauna Hackberry Stage, 

 Upper Devonian, p. 73, pi. 17, fig. 4, pi. 18, fig. 4, 1924. 



Although originally referred to Hernodia in which the zooecia arise 

 rather regularly from the middle portion of the preceding tube, this 



