THE HEDERELLOIDBA — BASSLER 41 



Occurrence. — Helderbergian (50 feet below top): Big Stone Gap, Va. 

 Holoty:pe.—[J.^.^M. No. 93956. 



HEDERELLA OCCIDENTAUS. new species 



Plate 6, Figure 15 



This species, represented by a none-too-well preserved specimen, 

 is described mainly to show the occurrence of Hederella in the De- 

 vonian faunas of the Western United States. The type, wliich 

 incrusts a Schizoyhoria, consists of a portion of a frequently branching 

 zoarium, dividing at intervals of 3 mm. at angles of 50° to 60°, emitting 

 zooecia 1.5 mm. long and 0.5 mm. wide, also at a high angle. 



Occurrence. — Devonian (Percha shale): Lake Valley, N. Mex. 



Holoty:pe.—\J.S.^.M. No. 87936. 



HEDERELLA CRASSILINEA. new species 



Plate 4, Figure 4; Plate 13, Figures 4, 5 



Although similar to H. germana from the Widder beds of Ontario 

 in the width of zooecia, surface ornamentation, and the right-angled 

 method of branching, this new species can be readily recognized by 

 the more regular and frequent budding of the tubes. These are short 

 (1.3 mm. long and 0.6 mm. wide) and emerge at an angle of about 

 45° at quite regular intervals of about 2 mm., with 2% to 3 in 5 mm. 

 Branching occurs at intervals of 5 to 10 mm. 



H. camdenensis from the Helderbergian of west Tennessee is also 

 similar but has longer zooecia and less regular budding. 



Occurrence. — Devonian: Fulton, etc., Callaway County, Mo. (holo- 

 type) (Snyder Creek shale) ; railroad fill northeast of Randalia (para- 

 type) and Iowa City (paratype), Iowa (Cedar Valley formation). 



Holotype and paraty pes. — V.S.N. M. Nos. 25462, 78639, 94571. 



HEDERELLA CAMDENENSIS, new species 



Plate 6, Figure 16 



This species, represented by a fragmentary zoarium incrusting a 

 Gypidula, is described in order to call attention to the presence of this 

 group of the genus in the Helderbergian of Tennessee. Although evi- 

 dently related to H. vagans, the present species branches more fre- 

 quently, the zooecia are longer (1.6 mm.) and wider (0.5 mm.) and 

 bud from the main axis at an angle of about 45° at more frequent 

 intervals, with 3 zooecia in 5 mm. More complete specimens will 

 probably reveal additional characters. 



Occurrence. — Helderbergian (New Scotland-Birdsong shale): Just 

 south of Camden, Tenn. 



Holotype.— U.S.N. M. No. 87968. 



139917—39 2 



