68 PROCEEDINGS OF THE NATIONAL MUSEUM vou»l 



HERNODIA (THEDERELLA) COMPACTA. new species 



Plate 15, Figure 4 



Incnisting brachiopod shells in the Columbus limestone is a species 

 belonging possibly to Hederella, characterized by the very compact 

 arrangement of the zooecia. The few specimens available for study 

 mdicate a frequently branching Hernodia (angle of 60°-90°), in which 

 the zooecial tubes bud from each other so frequently and at such a 

 low angle that they remain practically in contact throughout their 

 length. The tubes are IK to 2 mm. in length and 0.6 mm. in width, 

 with 3 to 4 in 5 mm. They clearly originate alternately from about 

 the midlength of the preceding zooecium at an angle of 30°. 



Occurrence. — Onondaga (Columbus limestone): Sandusky, Ohio. 



Holotype.—U.S.lSiM. No. 54124. 



FAUNAL LISTS SHOWING GEOLOGICAL AND GEOGRAPHICAL 



DISTRIBUTION 



Silurian (Gotlandian) : Island of Gotland. 



Hederella siluriana, new species. 

 Silurian (Ludlow-Budnany limestone): Kosor, etc., Bohemia. 



Hederella fruticosa (Pocta, 1894); H. formosa Prantl, 1938; Hernodia poBai 

 Pranti, 1938; Reptaria steiningeri (Barrande, 1868). 

 Silurian (Cayugan-Bertie limestone): Buffalo, N. Y. 



Hernodia f monahani, new species; Reptaria cayuga, new species. 

 Helderrergian (New Scotland limestone): Schoharie, Schoharie County, N. Y. 



Hederella helderbergia, new species. 

 Helderrergian (New Scotlaud-Birdsong shale): Swaynes Mills (S), Perry ville 

 (P), and south of Camden (C), Tenn. 

 Hederella camdenensis, new species (C) ; H. nodifera new species (P) ; HernO' 

 dia tennesseensis, new species (S) . 

 Helderrergian (50 feet below top): Big Stone Gap, Va. 



Hederella ulrichi, new species. 

 Oriskany sandstone: Becraft Mountain near Hudson, N. Y. 



Hederella arachnoidea Clarke, 1900; H. gracilior Clarke, 1900; H. magna 

 praecedens, new variety; H. ramea Clarke, 1900. 

 Onondaga (Upper Jeffersonville limestone-/Spiri/er acuminatus bed): Falls of the 

 Ohio at Louisville, Ky. 

 Hederella adnata (Davis, 1885); H. angulata (Davis, 1885); H. consimilis, 

 new species; H. contortilis, new species; H. delicatula, new species; H. 

 louisvillensis, new species; H. tenera, new species; Hederopsis bifurcata, new 

 species; H. connata, new species; H. curta, new species; H. longituba, new- 

 species; H. typicalis, new species; Hernodia ulrichi, new species. 

 Onondaga (Columbus limestone): Sandusky, Ohio. 



Hederella concinna, new species; Hernodia {f Hederella) compada, new species. 

 Onondaga (Decewville hmestone): Port Colborne, Ontario. 



Hederella canadensis (Nicholson, 1874); //. colbornensis, new species. 

 Onondaga drift: Vicinity of Ann Arbor, Mich. 

 Hederella canadensis (Nicholson, 1874). 



