518 CAMBRIAN BRACHIOPODA. 



(61) Limestone in the Dunderberg shale [Walcott, 1908f, p. 184], a little south of the Hamburg mine; and (62) 

 limestone in the Dunderberg shale [Walcott, 1908f, p. 184], in canyon immediately north of Adams Hill; both in the 

 Eureka district [Hague, 1892, Atlas], Eureka County, Nevada. 



(301) About 1,400 feet (426.7 m.) above the Middle Cambrian and 1,900 feet (579.1 m.) below the top of the Upper 

 Cambrian in the shales forming lb of the Orr formation [Walcott, 1908f , p. 176], on Orr Ridge, about 5 miles (8 km.) 

 south of Marjum Pass [Walcott, 1908f, PL XIII], House Range, Millard County; (15d) thin-bedded blue limestone near 

 Cave Spring, on the east side of the Fish Spring Range, about 4 miles (6.4 km.) south of the J. J. Thomas ranch, Juab 

 County; (32f) thin-bedded siliceous limestone near the top of the Upper Cambrian, about 2 miles (3.2 km.) southeast 

 of Muskrat Spring, on the northwest face of Grantsville Peak, Stansbury Range, Tooele County; and (30ci) limestones 

 about 2,300 feet (701 m.) above the Cambrian quartzitic sandstones on pipe line above limekiln, in Ogden Canyon, 

 1 mile (1.6 km.) above its mouth, east of Ogden, Weber County; all in Utah. 



(54b) About 1,200 feet (365.8 m.) above the Middle Cambrian, and 25 feet (7.6 m.) below the top of the Upper 

 Cambrian in the limestones forming 1 of the St. Charles formation [Walcott, 19081, p. 191]; (31m) about 175 feet 

 (53.3 m.) above the Middle Cambrian and 1,050 feet (320 m.) below the top of the Upper Cambrian, near the base of 

 the limestones forming 3 of the St. Charles formation [Walcott, 1908f, p. 192]; and (54e) about 200 feet (61 m.) above 

 the Middle Cambrian and 1,025 feet (212.4 m.) below the top of the Upper Cambrian, in limestones forming 3 of the 

 St. Charles formation [Walcott, 19081, p. 193]; all in Blacksmith Fork Canyon, about 10 miles (16.1 km.) east of Hyrum, 

 Cache County, Utah. 



Middle Cambrian: (7i) Limestone just west of the summit on the road east of Schellboume, Schell Creek Range, 

 White Pine County; and (7j) limestones at the north end of the Quinn Canyon Range, 1 mile (1.6 km.) northwest of 

 the Italian Ranch foothills, Nye County; both in Nevada. 



In the Nounan limestone in southern Idaho there is a narrow, elongate Lingulella that is 

 closely allied to L. manticula. It differs in being narrower in proportion to the length, in this 

 respect resembling Lingulella cania (Walcott) (PI. XXXV, figs. 3, 3a-d) of Nova Scotia. 



Formation and locality. — Middle Cambrian: (56f) Nounan limestone [Walcott, 1908a, p. 6], in a ridge north 

 of the creek which flows into Mill Canyon from the west, about 5 miles (8 km.) west-southwest of Liberty and 15 

 miles (24.2 km.) west of Montpelier, Bear Lake County, Idaho. 



Lingulella martinensis Matthew 

 Plate XXXVIII, figures 1, la-g. 



Lingulella davsoni Matthew (in part) [not (Walcott)], 1886, Trans. Roy. Soc. Canada for 1885, vol. 3, sec. 4, No. 3, 

 pp. 33-34, PI. V, figs. 9, 9a-c (not fig. 9d). (Described and discussed as a new species, but refers in synonymy 

 to Walcott, 1884a, p. 15. The specimen represented by figure 9d is referred in this monograph to Lingulella 

 ferruginea.) 



Lingulella martinensis Matthew, 1890, Trans. Roy. Soc. Canada for 1889, 1st ser., vol. 7, pp. 155-156, PI. VIII, fig. 4. 

 (Described as a new species.) 



Lingulella martinensis Matthew, 1895, Trans. New York Acad. Sci. for 1894-5, vol. 14, pp. 113-114, PI. II, figs. 6a-d. 

 (Described and discussed. Fig. 6a is copied from fig. 4 of the preceding reference. The specimens represented 

 by figs. 6b and 6d are redrawn in this monograph, PL XXXVIII, figs. Id-e, and la, respectively. Fig-s. 1, lb, 

 Ic are .also drawn from specimens in Matthew's type material, but further identification is impossible.) 



Lingulella cf. granvillensis Walcott, Matthew, 1895, idem, pp. 114-115, PL II, figs. 7a and 7b. (Described and dis- 

 cussed.) 



General form elongate ovate to subcuneate, with the ventral valve subacuminate, and the 

 dorsal valve elongate ovate ; the cardinal slopes of the ventral valve are nearly straight for fully 

 one-half the length of the valve. Ventral valve moderately convex; dorsal valve unusually 

 convex, especially over the umbonal region. 



Surface of the shell marked by fine concentric lines of growth, and very fhie, irregular 

 raised strife that form a surface of the type of that of Lingulella radula Matthew and Lin- 

 gulella {Lingulepis) roberti (Matthew) . The undulations cause the striae to touch and blend so 

 as to give the appearance of inosculation and a network of lines. The appearance of the sur- 

 face markings often varies considerably on different portions of the same valve. The interior 

 surface shows radiating lines and scattered punctse. The shell is preserved largely as casts of 

 the interior and exterior; it appears to have been built up of a thin outer layer and several 

 inner layers or lamellae. 



