THE HEDERELLOIDEA — BASSLER 57 



Occurrence. — MiddleDevonian: Smileswestof EastBethany (cotype) 

 (Centerfield shale), York (Ludlowville shale) (cotype), 18-Mile Creek 

 (Wanakah shale), IK miles south of East Bethany, and Pavilion 

 (Tichenor limestone), all in New York; Arkona, Ontario (Widder 

 shale); 2K miles southwest of Sylvania, Ohio (Silica shale); Lebanon, 



Ky. 



Co<?/^6S.— U.S.N.M. Nos. 87976-87980. 



HEDERELLA CONSIMILIS. new species 



Plate 5, Figure 12 



Although closely allied to H. bilineata in size and general aspect, 

 this new species differs in that it branches quite regularly at intervals 

 of about 4K mm. at a right angle, that the zooecia, although of about 

 the same length (1 mm. long and 0.2 mm. wide, and 6 in 5 mm.), are 

 narrower and bud at a wider angle (25°), so that they do not remain in 

 contact throughout their length. 



Occurrence. — Onondaga (Upper Jeffersonville limestone-/S'2?myer 

 acuminatus bed): Falls of the Ohio. 



Holotype.—\J.^.l<l.M. No. 54123. 



HEDERELLA LOUISVILLENSIS, new species 



Plate 5, Figure 8 



Although similar to H. consimilis in general aspect, the larger, 

 wider, more swollen, and more rapidly expanding zooecia of this new 

 species will distinguish it at once. The zooecia average 1.5 mm. in 

 length, 0.4 mm. in width, and 4 occur in 5 mm. Budding occurs at an 

 angle of 25° and branching at intervals of about 10 mm. and an angle 

 of 50°. 



Occurrence. — Onondaga (Upper Jeffersonville limestone->S2?'iri/er 

 acuminatus bed): Falls of the Ohio, Louisville, Ky. 



Holotype.—V.S.'N.M. No. 87985. 



HEDERELLA ROMINGERI. new specie* 



Plate 9, Figure 3 



In this new species, named in honor of Dr. Carl Rominger, pioneer 

 student of American Paleozoic corals, the zoarium occurs as a dense 

 mat of tubes incrusting some foreign object, in the case of the holotype 

 a ramose bryozoan. By unraveling the tubes it may be perceived 

 that branching occurs at intervals of 5 mm. and that both the branches 

 and the zooecia divide at such a small angle that the resulting colony 

 is closely compacted. The zooecial tubes average 2.2 mm. in length, 

 0.5 mm. in width, and about 3 zooecia occur m 5 mm. ; surface strongly 

 rugose. 



The presence of a narrow central tube, from which the zooecia bud 

 alternately to right and left, and the parallel arrangement of the latter 



139917—39 3 



