SPIRIFERA. 105 
Davidson includes Sp. speciosa in his list of fossils from Lummaton, but without 
remark; it has not been recognised among the fossils I have seen from that 
locality. 
3. SPIRIFERA UNDIFERA, F’, Romer. Pl. XIII, figs. 6, 7. 
1844, SprriFER UNDIFERUS, F. Romer. Rheinisch. Uebergangsgeb., p. 72, pl. vi, 
fig. 6. 
? 1859. — crcLoprerus, Hall. Pal. N. Y., vol. iii, p. 199, pl. xxv, figs. 
1 a—z. 
1864. SprriFERA UNDIFERA, Davidson. Brit. Foss. Brach., vol. iii, pt. 6, p. 36, 
pl. vii, figs. 1—10. 
1882. _ — Davidson. Ibid., vol. v, pt. 1, p. 33, pl. i, fig. 33. 
Localities—This seems a common shell. From Wolborough there are 
twenty-one specimens in Mr. Vicary’s Collection (some of which are still larger 
than those figured by Davidson), twelve in the Museum of Practical Geology, and 
eight in the British Museum. Inthe Torquay Museum are twelve specimens from 
Barton or Lummaton. From Lummaton there is one specimen in the Museum 
of Practical Geology, two in the British Museum, and seventy in my Collection, of 
all sizes and shapes, some being very well preserved. 
Remarks.—The ribs in the typical form vary considerably, being sometimes 
almost imperceptible and sometimes strongly defined. In a few specimens the 
furrows are bisected by minute threads, but this is evidently not a constant 
character even in the specimens that show it. In small shells the fold and sinus 
become very indistinct ; and in my Collection, besides the above, are about sixteen 
heart-shaped specimens, without fold or ribs, but similar in general shape to narrow 
specimens of the full-grown shell, which are probably young forms of the same 
species. 
The finer surface-markings vary considerably. Ordinarily they have the 
appearance of transverse lines, but in well-preserved specimens they are seen to be 
rows of dots or pectinations, and in one or two examples they are so much 
developed as to become consecutive rows of short radiating irregular lines. 
Sp. cyclopterus, Hall, seems to have the transverse lines rather coarser. 
4, Sprrirera conoinna, Hall? Pl. XIII, figs. 8, 8a. 
1859. SprrirER concinnvs, Hall. Pal. N. Y., vol. iii, p. 200, pl. xxv, figs. 2a—z. 
21864. SprrrFERA UNDIFERA, var. UNDULATA, Davidson. Brit. Foss. Brach., vol. iii, 
pt. 6, p. 37, pl. vu, figs. 11—14. 
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