514 CAMBRIAN BRACHIOPODA. 



Observations. — This neat little species iii some respects resembles Lingulella similis (Walcott). 

 It differs, as may be seen by comparing Plate XXIV, figures 2, 2a-c, with Plate XXI, figures 2, 

 2a-c, in being more elongate, the interior more strongly punctate, and in the more anterior 

 position of the central muscle scars in the dorsal valve. 



Formation and locality. — Upper Cambrian: (96) Limestones near the ford on the Cedartown road, 1.5 miles 

 (2.4 km.) south of Rome, Floyd County, Georgia. 



Lingulella lepis (Salter). 

 Plate XXXI, figm-es 4, 4a-f. 



Lingula lepis Salter, 1859, Siluria, by Mm-chison, 3d ed., p. 543. 



Lingulella lepis Salter, 1866, Mem. Geol. Siu-vey Great Britain, vol. 3, p. 334, fig. 11. (Described and discussed as 

 a new species.) 



Lingula ? lepis Salter, Davidson, 1866, British Fossil Brachiopoda, vol. 3, pt. 7, No. 1, p. 54, PL III, figs. 53-59. 

 (Described and discussed. Figs. 53-56 ai'e reversed views of Salter, 1866b, p. 334. fig. 11.) 



Lingula (Lingulella) lepis (Salter), Davidson, 1866, idem, description of Plate III. (Merely changes generic reference.) 



Lingulella lepis (Salter), Davidson, 1868, Geol. Mag., vol. 5, pp. 307-308, PL XV, figs. 10-12. (Discussed. Figs. 

 10 and 10a are copied (reversed) from the upper two of Salter's figures, 1866, p. 334, fig. 11.) 



Lingulella lepis (Salter), Davidson, 1871, British Fossil Brachiopoda, vol. 3, pt. 7, No. 4, PL XLIX, figs. 31 and 31a. 

 (Figs. 31 and 31a are reproduced in this monograph, PL XXXI, figs. 4a and 4, respectively.) 



Lingulella lepis (Salter), Salter and Etheridge, 1881, Mem. Geol. Survey Great Britain, vol. 3, 2d ed., p. 538, fig. 

 11. (A copy of Salter, 1866b, p. 334, fig. 11.) 



Lingula (Lingulella?) lepis (Salter), Brogger, 1882, Die silm-ischen Etagen 2 und 3, p. 44, PL X, figs. 5, 5a-b. (Occur- 

 rences mentioned in German.) 



Lingulella lepis (Salter), Holm, 1898, Geol. Foren. i Stockholm ForhandL, Bd. 20, p. 148. (Occurrences mentioned 

 in Swedish.) 



Lingulella lepis (Salter)?, Wiman, 1902, Bull. Geol. Inst. Univ. Upsala, vol. 6, pt. 1, No. 11, pp. 66 and 71. (Occur- 

 rences mentioned in German.) 



Lingulella cf. lepis (Salter), Matthew, 1903, Geol. Survey Canada, Rept. Cambrian Rocks Cape Breton, p. 204. (New 

 locality mentioned.) 



Lingulella lepis (Salter), Moberg and Segerberg, 1906, Medd. fran Lunds Geol. Faltklubb, Ser. B, No. 2 (Aftryck 

 ur K. Fysiografiska Sallskapets HandL, N. F., Bd. 17), pp. 62-63, PL I, fig. 20. (Occurrences discussed in 

 Swedish.) 



Lingula? corrugata Moberg and Segerberg, 1906, idem, p. 63, PL I, fig. 21. (Characterized in Swedish as a new 

 species.) 



Lingula? bryograptorum Moberq and Segerberg, 1906, idem, p. 63, PL I, fig. 22. (Characterized in Swedish as a 

 new species.) 



Lingula ? producta Moberg and Segerberg, 1906, idem, p. 63, PL I, fig. 23. (Described in Swedish as a newspecies.) 



Lingula ? ordovicensis Moberg and Segerberg, 1906, idem, p. 63, PL I, fig. 24. (Described in Swedish as a new 

 species.) 



Lingulella lepis Salter ?, WestehgArd, 1909, Medd. fran Lunds Geol. Faltklubb, Ser. B, No. 4 (Aftryck ur K. Fysio- 

 grafiska Sallskapets HandL, N. F., Bd. 20), p. 56, PL II, figs. 17-19. (Discussed in Swedish. Figs. 17 and 18 

 are copied from Moberg and Segerberg, 1906, PL I, figs. 28 and 27, respectively.) 



Lingula ? corrugata Moberg and Segerberg, Westergakd, 1909, idem, p. 57, PL II, fig. 23. (Characterized in 

 Swedish. Fig. 28 is copied from Moberg and Segerberg, 1906, PL I, fig. 21.) 



Lingula? bryograptorum Moberg and Segerberg, WestergArd, 1909, idem, p. 57, PL II, figs. 24a-b. (Characterized 

 in Swedish. Figs. 24a -b are copied from Moberg and Segerberg, 1906, PL I, figs. 22a-b, respectively.) 



I was in doubt about this species until after studying a fine series of specimens collected 

 for me by Schmalensee at various localities in Sweden. The Swedish shells, in a limestone 

 matrix, have a broader outline than the typical forms of Lingulella ferrugiri^ea, in a limestone 

 matrix, although some of the latter are as broad when flattened in the matrix. When the shells 

 of L. lepis are compressed laterally they look very much like those of L. ferruginea Salter. 

 Under like conditions of preservation they appear to be distinct. The interior surface is marked 

 by concentric lines of small pits. The outer surface varies from an almost smooth and polished 

 surface marked by concentric lines of growth to a broken surface marked by concentric lines 

 and radiating, more or less irregular, raised ribs. All the characters known are illustrated 

 on Plate XXXI. 



The American representative of this species, Lingulella hella (Walcott), which has a strati- 

 graphic range similar to that of the shell from Wales, from the Upper Cambrian into the Lower 



