328 CAMBRIAN BRACHIOPODA. 



Observations. — This shell was identified as the dorsal valve of Kutorgina cingulata by Bill- 

 ings [1861b, p. 8, fig. 9] and as the ventral valve of the same species by myself [1886b, p. 102, 

 PL IX, figs. Ig and Ih, and 1891a, p. 609, PI. LXIX, figs. Ig and Ih]. They were considered 

 as distorted, flattened shells. Better material shows them to represent one of the simplest 

 forms of brachiopod known; with the exception of the rudimentary pedicle furrow and area 

 there is nothing more than the gapmg valve, much Hke Charles E. Beecher's ideal "Paterina" 

 [1891, p. 345]. 



The specific name is given in recognition of the excellent work of Mr. George Edson, of 

 St. Albans, Vermont, in collecting the Lower Paleozoic fossils of that region. 



Formation and locality. — Lower Cambrian : (25) " Sandstone just above Parker's quarry, near Georgia; and (319r) 

 on the BuUard farm about 2 miles (3.2 km.) east of Swanton; both in Franklin County, Vermont. 

 (392o) Arenaceous limestone collected somewhere in Vermont (exact location unknown). 



(49) Sandstone on Codorus Creek, 0.125 mile (0.2 km.) below Meyer's mill, near Emigsville; and (49a) sand- 

 stone on the Liverpool road, south of the schoolhouse, 3 miles (4.8 km.) northwest of York; both in York County, 

 Pennsylvania. 



RusTELLA? MAJOR (Matthew). 

 u 



Text figure 19. 



Obolus ? major Matthew, 1890, Trans. Roy. Soc; Canada tor 1889, 1st ser., vol. 7, sec. 4, No. 12, p. 155, PI. VIII, fig. 3. 



(Described and discussed as a new species; see below for copy of description. The specimen represented by 



fig. 3 is redrawn below, fig. 19.) 

 Mickwitzia? major (Matthew), Mickwitz, 1896, M6m. Acad. imp. sci. St.-P^tersbourg, 8th ser., vol. 4, No. 2, p. 23. 



(Discussed in German.) 



The original description by Matthew follows: 



Only the dorsal valve known. This is transversely oval, flattened near the umbo, 

 and deep within the edges toward the back of the shell. 



The interior markings seem those of an Obolus. The median line is strongly marked 

 just within the umbo, and at the middle of the shell, in front of which it appears to fork. 

 The scars of the posterior laterals only are distinct. 

 A A. rpj^g example known shows the interior of the shell and a little of the external surface. 



Figure n.—P.ustella? major The shell was thin, and is changed to iron oxide. The outer surface near the edge of the 

 (Matthew). A, A '.Cast from a shell was covered by fine radiating lines or ridges, 

 natural mold in sandstone; 



side outline restored. From Observations. — The type and only specimen of this form is preserved 



Locality 301v, Lower Cam- -'.^ •' '^ • • i i ii i i i 



iDrian shales on Hantord as a natural mold m an impure sandstone; the origmai shell had been 

 Brook, New Brunswick, j-gmovcd, and the resulting mold is very similar to those of Rustella 



The original mold is in the ' ^ n • i -i • i 



collections of the University edsoni (PI. I, figs. 1 and la) from a finc-gramed sandstone; m the case 

 of Toronto. The cast from ^^ ^^yq latter sDCcies oiily a film remains to indicate the original shell, while 



which the figure was drawn is ^ *: iiii-i i iin*i 



in the collections of the u. s. in the calcareous nodules embedded in the sandstone the shell is shown 

 National Museum, Cat. No. ^ ^ f considerable tliickness. 



51462. This specimen was ..... 



figured by Matthew [1890, PI. The reference to the genus Rustella is based on the similarity m 



vin, fig. 3]. gj^g ^^^ form between this species and Rustella edsoni and the fact that 



Rustella? major occurs at about the same stratigraphic horizon in the Lower Cambrian as R. 



edsoni and below the recognized Middle Cambrian fauna. At the same locaHty and at about 



the same horizon I found several Lower Cambrian fossUs: Micromitra (Paterina) labradorica, 



Hyolitlies cf. communis, Goleoloides cf. typicalis [Walcott, 1900, p. 322]. 



Formation and locality.— Lower Cambrian: (301v [Matthew, 1890, p. 155]) Sandy shales of Division 2b of the 

 "Basal series" of Matthew, on Hanford Brook, St. John County, New Brunswick, Canada. 



a The type locality is in italics; where there is but one locality, however, this will not be italicized. When a locality is not represented in 

 the collections of the United States National Museum, the authority for its citation is given immediately after the locality number, or at the end of 

 the paragraph, if several can be grouped under the one reference. 



