OBOLIDiE. 511 



Middle Cambrian: (30n) About 3,750 feet (1,143 km.) above the Lower Cambrian and 650 feet (198 m.) below 

 the Upper Cambrian in the shaly limestones forming Ic of the Weeks limestone [Walcott, 190Sf, p. 175], on the north 

 side of Weeks Canyon, about 4 miles (6.4 km.) south of Marjum Pass, House Range [Walcott, 1908f, PI. XIII], Millard 

 County; and (Sly) thin-bedded limestone about 125 feet (38 m.) above the Cambrian quartzitic sandstones, in the 

 Wasatch Mountains, 1 mile (1.6 km.) northwest of Geneva, east of Brigham, Boxelder County; both in Utah. 



(54s) Dark blue-gray Langston limestone [^'alcott, 1908f, p. 198], just above the Cambrian quartzitic sandstones, 

 north side of Twomile Canyon, near its mouth, 2 miles (3.2 km.) southeast of Malade, Oneida County, Idaho. 



(57n)a About 3,000 feet (914.4 m.) above the Lower Cambrian and about 700 feet (213.4 m.) above the base of 

 a limestone correlated with No. 4 of the Eldon limestone on Mount Bosworth [Walcott, 190Sf, p. 209], on the north- 

 west slope of Mount Stephen, above Field on the Canadian Pacific Railway, British Columbia. 



LiNGTjLELLA KiTJEENSis (Waagen). 

 '^ Plate XXX, figures 5, 5a, 6, 6a. 



Lingula ? kiurensis Waagen, 1885, Mem. Geol. Sm'vey India, Paleontologia Indica, 13th ser., Salt Range Fossils, vol. 



1, pt. 4, fas. 5, pp. 768-769, PL LXXXVI, figs. 8a-b. (Described and discussed as a new species, see below. 



The specimen represented by figs. 8a-b is redrawn in this monograph, PL XXX, fig. 6.) 

 Lingula f warthi Waagen, 1885, idem, pp. 769-770, PL LXXXVI, figs. 9a-b. (Described and discussed as a new 



species. The specimen represented by figs. 9a-b is redrawn in this monograph, PL XXX, fig. 5.) 

 Lingula ? kiurensis Waagen, 1891, idem, vol. 4, pt. 2, PL II, figs. 17a-b. (No text reference. Figures copied from 



those representing L. ivarthi Waagen, 1885, PL LXXXVI, figs. 9a and 9b. Figures 17a-b are reproduced in this 



monograph, PL XXX, fig. 5a.) 

 Lingula? «)artAt Waagen, 1891, idem, vol. 4, pt. 2, PL II, figs. 18a-b. (No text reference. Figures copied from 



those representing L. kiurensis Waagen, 1885, PL LXXXVI, figs. 8a and 8b. Figs. 18a-b are reproduced in 



this monograph, PL XXX, fig. 6a.) 



Through the courtesy of the director of the Geological Survey of India, IVIr. T. H. Holland, 

 I have had the opportunity of studying the tyjje specimens of the two species described by 

 Waagen. Of Lingulella kiurensis, Waagen mentions [1885, p. 769] that he had a single speci- 

 men, which he considered to be a ventral valve. He also had but one specimen of the second 

 species, "Lingula? warthi," which he could not decide as either a ventral or dorsal valve. I 

 find that the two specimens are from the same locality and from the same bed of rock. Waagen 

 stated [1885, p. 770] that he long considered them as belonging to the same species, but owing 

 to the existence of a "reticulation" on the lateral parts of ' 'L. ? warthi" he decided to separate 

 the latter as a distinct species. In a reflected light I fuid traces of the "reticulation" on the 

 outer portions of L. kiurensis, and it is quite common in an arenaceous matrix to find shells 

 from which the finely reticulated outer surface has been abraded. My interpretation of the 

 two specimens is that they represent one species, and that Waagen's type of "Lingula? warthi" 

 is the ventral valve and the type of his "Lingula? Iciurensis" the dorsal valve. Carefully 

 made drawings have been prepared of the two type specimens, and beside them are repro- 

 duced the somewhat diagrammatic figures accompanying Waagen's description. 



In 1891 Waagen refigured [1891, PI. II, figs. 17a-b] the specimen which he described in 

 1885 [1885, p. 769] as "Lingula warthi" and labeled it "Lingula? Iciurensis." Similarly, the 

 specimen which he described [1885, p. 768] as ' 'Lingula? Iciurensis" is [1891, PI. II, figs. 18a-b] 

 labeled " Lingula? warthi." 



The original description by Waagen follows: 



The general form of the shell is an elongate oval with the ventral valve slightly more acuminate than the dorsal; 

 original convexity unknown, as both specimens are flattened in the matrix and one is slightly crushed. Surface 

 marked by round striae of growth that vary in size, and a few narrow, irregular, rounded, radiating ribs on the sides. 



Waagen [1885, p. 768] described this species under the impression that it was from the 

 Productus limestone of the Carboniferous. Subsequently, this view was modified on account 

 of the discovery of Cambrian fossils by Warth. The history of the discoveries and discussion 

 is very clearly presented by Noetling [1894, pp. 71-86] in an article on the "Cambrian forma- 

 tion of the Salt Range." 



The first impression made by this shell when comparing it with other species of Lingulella 

 is that it is an Upper Cambrian type. Its broad oval outline is not unlike that of Lingulella 



" The species is somewhat doubtfully identified from this locality. 



