108 DEVONIAN FAUNA. 
7. SPIRIFERA INFIMA,n. sp. Pl. XIII, figs. 1—3. 
1882. SprrireRaA Uri, Davidson (pars). Brit. Foss. Brach., vol. v, pt. 1, p. 34. 
1886. — — Wenjukof. Faun. Dev. Syst. N. W. and Cent. Russl., 
p. 507, pl. iv, fig. 14. 
Description.—Shell minute, with a slight linear sinus on the front of each 
valve. Dorsal valve flat, semi-oval. Ventral valve very deep. Hinge-line 
straight, as wide as the shell, with sharp or slightly rounded lateral angles. 
Area very broad, nearly horizontal. Beak very sharp, low, distant, slightly 
recurved. Surface smooth. 
Size.—Length, 7 mm.; width, 8 mm.; depth, 5 mm. 
Localities.—There are twenty examples of this little shell in my Collection, six 
in the Woodwardian, and two in the British Museum. 
Remarks.—I hardly think that these tiny fossils can belong to the same 
species as the Sp. Uric’ that is so abundant in the Pilton Beds. They differ from 
it in several particulars, as size, depth of sinus, length of hinge-line, and sharpness 
of lateral angles. From the species as generally known in the Upper Paleozoic 
they are distinguished by having sharper lateral angles and a wide receding area, 
over which the beak is slightly curved at its extremity. ‘The hinge-line is as 
wide as the shell, and the median sinus is usually slight. Some shells, however, 
come nearer to the usual shape. It is possible that some of these specimens 
may only be the fry of other species. The sharp-angled form is, however, 
certainly a true species, though it was admitted by Davidson as Sp. Urii upon my 
sending it to him. 
8. SPIRIFERA LINEATA, Martin, sp. 
1809. ANomiITEs LInEATUS, Martin. Petref. Derb., p. 12, pl. xxxvi, fig. 3. 
1864. SprriFERA LINEATA, Davidson. Brit. Foss. Brach., vol. iii, pt. 6, p. 43, 
pl. iv, figs. 183—15. 
Remarks.—About seventeen small and generally defective specimens from 
Lummaton in my Collection seem to agree in general shape with this shell, both 
about the umbonal parts, and in having no fold or sinus, but none of them show 
the characteristic lineations. That they belong to this species I am not sure. 
I think they are more probably immature specimens of Sp. cwrvata. 
Davidson records it from Wolborough, but not from Lummaton. 
1 1864, Davidson, ‘ Brit. Foss. Brach.,’ vol. ii, pt. 6, p, 41, pl. iv, figs. 25—28. 
