490 CAMBRIAN BRACHIOPODA. 



lAngula sp. Sedgwick, 1847, Quart. Jour. Geol. Soc. London, vol. 3, pt. 1, pp. 140, 143, and 147. (Mentioned only.) 

 Tellinomya lingulx-comes McCoy [not Salter],' 1851, Annals and Mag. Nat. Hist., 2d ser., vol. 7, p. 56. (Described 



and discussed. Salter's species is not a brachiopod and is not taken up in this monogi-aph.) 

 Lingula davisi McCoy, 1851, idem, vol. 8, pp. 405^06. (Described and discussed as a new species.) 

 lAngula davisi McCoy, 1854, British Paleozoic Fossils, p. 252, PL IL, figs. 7, 7a-b. (Description copied from preceding 



reference and one locality added.) 

 Lingula ovata McCoy (in part), 1854, idem, p. 254, PL IL, figs. 6 and 6a. (Described and discussed. Specimens of 



Linguhlla davisi were included with "Lingula ovata" in this description. The specimens belonging with 



Lingula ovata are not taken up in this monograph.) 

 Tellinomya lingulicomes McCoy [not Salter], 1854, idem, p. 274, PL IX, fig. 18. (Described and discussed almost as 



in McCoy, 1851n, p. 56.) 

 Linguhlla davisi (McCoy), Salter, 1866, Mem. Geol. Survey Great Britain, vol. 3, pp. 333-334, PL II, figs. 7-12, PL 



IV, figs. 14 and 14a. (Described in Latin and discussed in English.) 

 Lingulella davisii (McCoy), Davidson, 1866, British Fossil Brachiopoda, vol. 3, pt. 7, No. 1, pp. 56 and 57, PL IV, 



figs. 1-16. (Described and discussed. Figs 9, 3, 7, 6, 4, 5, 13, 14, and 15 are copied from Salter, 1866b, PL II, 



figs. 7-12, and PL IV, figs. 14 and 14a, respectively. Figs. 10, 11, and 12 are reproduced in this monograph, PL 



XXXI, figs. 6, 6a-b, respectively.) 

 Lingulella davisii (McCoy), Salter, 1867, Siluria, by Murchison, 4th ed., pp. 44 (and footnote) and 52; fossils (5) 



fig. 1; fossils (10), fig. 11. (Mentioned.) 

 Lingulella davisi (McCoy), Davidson, 1868, Geol. Mag., vol. 5, pp. 304 and 306, PL XV, figs. 13-15. (Species discussed.) 

 Lingulella davisi (McCoy), Meek, 1871, Proc. Acad. Nat. Sci. Philadelphia for 187], vol. 23, pp. 186-187, fig. 2, p. 185. 



(Discussed in discussion of "Lingulella lamborni." Fig. 2 is copied from Davidson, 1866, PL IV, fig. 14.) 

 Lingulella davisii (McCoy), Hall, 1873, Twenty-third Ann. Kept. New York State Cab. Nat. Hist., PL XIII, fig. 4. 



(No text reference. Fig. 4 is copied from Davidson, 1866, PL IV, fig. 16.) 

 Lingulella davisii (McCoy), Roemer, 1876, Letheea geognostica, pt. 1, Lethaea palseozoica. Atlas, PI. II, figs. 5a-c. 



(No text reference.) 

 Lingulella davisii (McCoy), Salter and Etheridge, 1881, Mem. Geol. Survey Great Britain, vol. 3, 2d ed., pp. 537-538, 



PL II, figs. 7-12; PL IV, figs. 14 and 14a. (Copied from Salter, 1866b, p. 333, PL II, figs. 7-12; PL IV, figs. 



14 and 14a.) 

 Lingulella sp. Kayser, 1883, China, by Richthofen, vol. 4, pp. 35-36, PL III, fig. 3. (Described in German. Fig. 



3 is reproduced in this monograph, PL XXX, fig. 2a.) 

 Lingulella davisi (McCoy), Hall and Clarke, 1892, Eleventh Ann. Rept. State Geologist New York for 1891, p. 232, 



fig. 239. (No text reference, figure copied from Salter, 1866b, PL IV, fig. 14a.) 

 Lingulella davisi (McCoy), Hall and Clarke, 1892, Forty-fifth Ann. Rept. New York State Museum for 1891, p. 548, 



fig. 239. (Copy of preceding reference.) 

 Lingulella davisi (McCoy), Hall and Clarke, 1892, Nat. Hist. New York Paleontology, vol. 8, pt. 1, pp. 56 and 57, 



fig. 18. (Discussed in the text and figure copied from Salter, 1866b, PL IV, fig. 14a.) 

 Lingulella cf. davisii (McCoy), Kayser, 1897, Zeitschr. Deutsch. geol. Gesell. for 1897, Bd. 49, Heft 2, No. 2, p. 280, PL 



VII, fig. 6. (Characterized. Fig. 6 is reproduced in this monograph, PL XXX, fig. 2.) 

 Obolus (Lingulella) davisii (McCoy), Walcott, 1898, Proc. U. S. Nat. Mus., vol. 21, pp. 394 and 395, PL XXVII, figs. 1-5. 



(Mentioned in discussion of genus Lingulella. The specimens represented by figs. 1, 2, 4, and 5 are redrawn in 



this monograph, PL XXX, figs. 6f, 6d, 6e, and 6h, respectively.) 

 Lingulella cf. davisii (McCoy), Matthew, 1902, Bull. Nat. Hist. Soc. New Brunswick, vol. 4, pt. 5, No. 20, pp. 407-408. 



(Described.) 

 Lingulella cf. davisii (McCoy), Matthew, 1903, Geol. Survey Canada, Rept. Cambrian Rocks Cape Breton, p. 203. 



(Copied from preceding reference.) 



The characters of this species, as far as known to me, are illustrated on Plate XXXI, and 

 reference is made to some of them in the description of the genus Lingulella. Many interest- 

 ing observations are given by Davidson [1866, p. 57] in his description of the species and its 

 occurrence at various localities in Wales. 



E. Kayser [1897, PI. VII, fig. 6] illustrates a dorsal ? valve from the Cambrian beds of Iruya, 

 Province of Salta, Argentina, which he compares with Lingulella davisi. The specimen indicates 

 the presence of a form that may be the representative of L. davisi, but it may be a new form, 

 or possibly identical ^vith some one of the species of the Atlantic basin fauna found in New 

 Brunswick or Newfoundland. The original figure is reproduced on Plate XXX, figure 2. 



The form illustrated by Kayser [1883, PI. Ill, fig. 3] in the report on the Cambrian brachi- 

 opods of Liaotung is also suggestive of Lingulella davisi, as may be seen by comparing a copy 

 of Kayser's figure on Plate XXX with the illustration of L. davisi on Plate XXXI, figure 2a. 



