THE HEDERELLOIDEA — BASSLEB 43 



Occurrence. — Devonian (Gaspe sandstone): Portage Road, Gasp6, 

 and Haldemand, Quebec. 



Pleisotyfes.—V.S.'^M. Nos. 87981, 87982. 



HEDERELLA RAMEA Clarke. 1900 



Plate 13, Figure 10 



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

 9, fig. 9, 1900. 



As shown by the original illustration and a further enlargement of 

 the holotype on Clarke's plate 9, this species is related to H. blain- 

 villei, differing in that branching occurs more regularly and at shorter 

 intervals, sometimes as close together as 3 mm. The zooecial tubes 

 also are not so wide (0.35 mm. instead of 0.5 mm.) and much longer 

 (3 mm.), sometimes reaching a length of an entire branch before 

 giving rise to other zooecia. The angle both of branching and of 

 budding is less than 30°, but both zooecia ajud branches remain quite 

 separate and form a palmate expansion. 



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

 N. Y. 



Plastoholotype.—U.S.^.M. No. 87922. 



HEDERELLA PAVTLIONENSIS. new speciea 



Plate 4, Figure 5 



Zoarium as in H. vagans and H. ramea, with the same loose manner 

 of growth but the unilinear axis branches more frequently at a 45° 

 angle, forming a much divided ensemble with quite elongated indi- 

 vidual tubes, which bud at an angle less than 45°. Growth in general 

 more robust than in H. vagans, the tube diameter being 0.5 mm. 

 and the zooecia 2 to 4 mm. or more long. H. germana has the same 

 width of zooecia but differs in its right-angled branching and shorter 

 zooecia. 



Occurrence. — Hamilton group: PavUion and Iji miles south of East 

 Bethany (Tichenor limestone), and 3 miles west of East Bethany 

 (Centerfield shale), N. Y. 



Holotype.— U.S.t^.M. Nos. 87932, 87933. 



Hederella thedfordensis section 



HEDERELLA THEDFORDENSIS, new species 



Plate 1, Figures 7-12; Plate 13, Figure 2 



Hederella canadensis Hall and Simpson (part), Pal. New York, vol. 6, pi. 65, 

 fig. 2, 1887. 



Associated with H. filiformis in the type locality in equal abun- 

 dance and also growing usually upon ,'Spirifer mucronatus thedfordensis 



