EDMONDIA. 79 



in the Barnstaple Athenaeum one from Marwood, a cast and mould from Sloly, 

 and a large fragment of the posterior side from Sloly, which shows the minor 

 ornament; and in the Porter Collection two from Pilton. 



Remarks. — One of the characteristics of this species seems the indistinct 

 double swelling of the posterior slope. Its rather prominent and irregular 

 ornament, which abruptly vanishes behind, seems another distinguishing feature. 



Affinities. — Fullastra complanata, Sow.,^ as given by Phillips,^ differs by having 

 the inferior margin concave, the posterior ridge stronger, and the surface smoother. 

 Sowerby's own shell is also more deltoidal. 



Lejytodomus semisulcata, Phillips, sp.,^ approaches it in ornament, but is very 

 different in shape, being more convex, with a more anterior umbo and a dorsal 

 constriction. 



Sanguinolaria lirata, Phillips,* though looking somewhat similar in Phillips's 

 figure, is really totally different in shape, character, and ornament. It belongs to 

 the genus Gtenodonta. 



Olossites Manitobensis, Whiteaves,^ simulates it in ornament, but is narrower, 

 and is more definitely flattened and smoothed behind. 



SanguinoUtes concentricus, Goldfuss,® or rather, Beushausen,'' sp., appears to 

 have stronger and more regular markings, which are cont-inued over the posterior 

 slope, and also a smaller and lower umbo. It was described by Goldfuss® under 

 the name Sanguinolaria sulcata, Phillips,^ but the original S. sulcata is very 

 different, being wider behind, and without any posterior compression or truncation. 



3. Genus — Edmondia, de Koninch, 1842. 



Shell equivalve, oval or subcircular. Beaks central or anterior. Surface 

 with concentric striae, and sometimes obscure rays. Hinge narrow, edentulous. 

 Ligament external. Muscle-marks superficial. Pallial line simple. 



^ 1839, Sowerby, in Murchison's ' Sil. Syst.,' p. G09, pi. v, fig. 7. 



2 1841, Phillips, ' Pal. Poss.,' p. 35, pi. xvii, fig. 56. 



^ Ibid., p. 36, pi. xvii, figs. 57 a — c. 



* Ibid., p. 136, pi. Iviii, figs. 53* a, h. 



5 1892, Whiteaves, ' Cont. Canad. Pal.,' vol. i, pt. 4, p. 310, pi. iv, fig. 7. 



6 1832, Goldfuss, in De la Beche's ' Handbuch,' p. 531. 



7 1895, Beushausen, ' Abhaadl. k. Preuss. Geol. Landes.,' n. s., pt. 17, p. 289, pi. xxvi, figs. 10, 11. 



8 1834-40, Goldfuss, ' Petref. Gel-m.,' vol. ii, p. 278, pi. clix, fig. 11. 

 » 1836, Phillips, ' Geol. Yorks.,' vol. ii, p. 209, pi. v, fig. 5. 



