42 PROCEEDINGS OF THE NATIONAL MUSEUM VOL.87 



BEDERELLA RECTIFURCATA, new species 



Plate 7, Figure 16 



This species is characterized by its rather straight primary branches 

 from which secondary branches arise at intervals of about 3 mm. almost 

 at right angles, both of which in turn give origin at the same angle (at 

 intervals of 1.5 mm.) to very short zooecia terminated by elliptical 

 apertures directed upward. Branches and tubes about 0.3 mm. in 

 diameter; 2 to 3 zooecia in 5 mm. 



The rectangular method of branching and the very short zooecial 

 tubes arising at a right angle make this species of the H. canadensis 

 group easily recognized. Although similar to H. angulata (Davis) in 

 general dimensions and short buds, H. rectifurcata is readily distin- 

 guished by its closer branching and its budding at a right angle. 



Occurrence. — Middle Devonian: 18-Mile Creek (holotype) and 

 Athol Springs (Wanakah shale), Iji miles southeast of East Bethany 

 (Moscow-Kashong shale), Kashong Creek (Ludlowville shale), 3 

 miles west of East Bethany (Centerfield shale) and 1^ miles south of 

 East Bethany (Tichenor limestone), all in New York; 2}^ mUes south- 

 west of Sylvania, Ohio (Silica shale); Milwaukee, Wis. (Milwaukee 

 limestone); Petoskey Cement Co., Petoskey, Mich. (Traverse-Gravel 

 Point limestone); Thedford and vicinity, Ontario (Widder shale). 



Holotype.— V.S.l^M, Nos. 50247, 87923-87926. 



Hederella blainvillei section 



HEDERELLA BLAINVILLEI Clarke, 1907 



Plate 13, Figure 6 



Hederella Uainvillei Clarke, New York State Mus. Bull. 107, p. 289, fig., 1907; 

 New York State Mus. Mem. 9, pt. 1, p. 242, pi. 48, fig. 2, 1908. 



This species, which forms gracefully expanding incrustations upon 

 brachiopod shells, is closely related to H. ramea Clarke but differs in 

 its "much more rapidly branching zoaria and consequently shorter 

 cells producing a fuller and denser stock." The original illustration 

 on plate 13 exhibits these features and shows that the bushy aspect 

 of the zoarium is caused by the very regular branching at intervals 

 of about 4 mm. and at an angle of about 30°, and the equally regular 

 budding of the zooecia at the same angle. Width of branches and 

 zooecia 0.5 mm., length of zooecia 2 to 3 mm. 



As noted, H. ramea Clarke has a similar method of growth but the 

 zooecia are longer and narrower. Hederella species,* described by 

 Clarke from the Lower Devonian Moose River sandstone of Moose- 

 head Lake, Maine, is almost certainly the same as H. blainvillei. 



* Clarke, New York State Mus. Mem. 9, pt. 2, pi. 21, figs. 18, 19, 1909. 



