SPIRIFERA—CYRTINA. Ti 
Affinities. —The strong dorsal fold and the fine radiations at once distinguish it 
from Sp. simplex, Phillips. 
Spirifer pyramidalis, Schnur,' differs entirely in the shape of the fold, which 
is more rounded, broader, and undefined, and also by the presence of transverse 
lineations. 
9. Genus.—Cyrtina, Davidson, 1858. 
1, Cyrtina HETsRoCLITA, Defrance. Pl. XII, figs. 11, 12. 
1824. 
1857. 
1861. 
1864. 
1867. 
1868. 
1868. 
1879. 
1882. 
1882. 
1884. 
1885. 
1886. 
1887. 
1887. 
1889. 
1891. 
CaLcEoLA HETEROCLITA, Defrance, Dict. Sci. Nat., vol. xxxii, p. 306, pl. 
Ixxx, figs. 3, 3a. 
Cyrt1a Hamiironensis, Hall. Tenth Report State Cabinet, p. 166. 
—_ — Billings. Dev. Foss. Canada West, p. 263. 
CyrTIna HETEROCLITA, Davidson. Brit. Foss. Brach., vol. ili, pt. 6, p. 48, 
pl. ix, figs. 1—10. 
Crrt1a Hamitronensis, Hall. Pal. N. Y., vol. iv, pt. 1, p. 268, pl. xxvii, 
figs. 1—4; and pl. xliv, figs. 26—52. 
—  aFFINIS, Billings. Pal. Foss., vol. ii, pt. 1, p. 49, pl. iiia, figs. 6, 
6a, 68. 
—  Hamritronensis, Meek. Trans. Chicago Ac. Sci., vol. i, p. 99, pl. 
xiv, figs. 5, 7, 10. 
—  HETEROCLYTA, Barrande. Syst. Sil. Bohém., vol. v, pl. viii, figs. 1 
—6; and pl. exxiv, fig. 3, Et. F. 
CryrtTIna HETEROCLITA, Barrois. Mém. Soc. Géol. Nord, vol. ii, p. 260, 
pl. x, fig. 8e (only). 
— — Davidson. Brit. Foss. Brach., vol. v, pt. 1, p. 37, 
pl. i, figs. 85—37. 
— — var. MULTIPLICATA, Beushausen. Abhandl. Geol. 
Specialk. Preuss., vol. vi, pt. 1, p. 122, pl. 
vi, figs. 20 a, b. 
— — Maurer. Abhandl. Grossh. Hessisch. Geol. Landes., 
vol. i, pt. 2, p. 162, pl. vii, figs. 3—4a. 
--- a= (@hlert. Ann. Sci. Géol., vol. xix, p. 40, figs. 21—34. 
— — Bechard. Bull. Soc. Belge Géol., vol. i, p. 83. 
— — Tschernyschew. Mém. Com. Géol., vol. iii, pt. 3, 
p. 78, pl. x, figs. 15 a—d. 
— _— Toll. Mém. Acad. Imp. Sci. St. Pétersbourg, ser. 
7, vol. xxxvii, No. 3, p. 17, pl.i, figs. 8 a—e. 
—  MHamrtronensts, Whiteaves. Contrib. Canad. Paleont., vol. i, 
pt. 3, p. 226, and pt. 4, p. 288. 
Localities —This is one of the commonest fossils at Lummaton, where I have 
collected it by hundreds, and specimens are to be seen in most museums. ‘T'wo 
figured by Phillips are in the British Museum. From Wolborough there are 
1 1854, Schnur, ‘ Paleontographica,’ vol. iii, p. 207, pl. xxxvi, figs. la—e. 
