CYPRICARDELLA SELYS1ANA. 353 



Localities. — Scotland : the Upper Limestone series of Westerhouse and Gare, 

 in shale above the Arden Limestone, Carluke. 



Observations. — This species is one of two very distinct species of the genus 

 Cijpri car delta described by Armstrong {op. supra cit.). In the Armstrong Collection 

 of the Edinburgh Museum of Science and Art are four tablets labelled Cypricardia 

 crebricostata. Dr. Traquair has kindly compared them for me with specimens of 

 other Scotch species which I forwarded to him, so that there is no doubt of the 

 true characters of Armstrong's species, which can be distinguished from all others 

 of the genus by its shape and markings. The concentric ribs are very regular, 

 closer and finer than obtains in any other species. The shell is comparatively 

 more gibbose than G. parallela, and has the posterior end narrowed from above 

 downwards by the descent of the upper border, which is very marked. All the 

 localities where the shell has been yet obtained are on one horizon, which is placed 

 at 300 fathoms below the Ell coal. Armstrong's figures are much enlarged, but 

 are not particularly distinctive of the species. 



Cypricaedella Seltsiana, de Koninch, sp., 1843. Plate XXXIX, figs. 27 — 30. 



Cypricaedia Sklysiana, de Koninck, 1843. Desc. Anim. Foss., p. 95, pi. vi, 



fig. 7. 



— — d'Orbigny, 1850. Prodrome de pale'ontol., p. 130. 

 Teapezium Liellianum, de Bychholt, 1853. Melanges paleontol., 2rae partie, 



p. 133, pi. xiv, figs. 27, 28. 



— pbjesectum, de Bychholt, 1853. Ibid., p. 132, pi. xiv, figs. 15. 16. 

 Ctpricaedia ehombea, Young and Armstrong, 1871. Trans. Geol. Soc. Glas., 



vol. iii, Supplement, p. 51. 



— — Armstrong, Young, and Rohertson, 1S7G. Cat. West. 



Scotl. Foss., p. 53. 



— Selysiana, Bigsby, 1878. Thesaurus Devonico-Carboniferus, p. 305. 

 Teapezium pb^sectum, Bigsby, 1878. Ibid., p. 315. 



— Lyellianum, Bigsby, 187S. Ibid., p. 315. 



Sanguinolites Selysianus, de Eoninck, 1885. Ann. Mus. Hoy. d'Hist. Nat. 



Belg., torn, xi, p, G4, pi. xv, fig. 36. 



— Lyellianus, de Koninch, 1885. Ibid., p. 64, pi. xv, fig. 39 ; 



pi. xvii, figs. 9, 10. 



— pe^sectus, de Koninck, 1885. Ibid., p. 67, pi. xv, fig. 37. 

 Cvpricaedia Selysiana, Etlieridge, 1888. Brit. Foss., pt. 1, Palaeozoic, p. 282. 



Specific Characters. — Shell very inequilateral, subquadrate, oblique, only 

 moderately tumid, carinate. The anterior end is short and narrow in the dorso- 

 ventral diameter, compressed, and its border is gradually rounded, its upper 

 border being much below the level of the umbones. The inferior border is convex 



