Tetragraptus headi (Hall, 1858)

1858     Graptolithus headi — Hall, pp. 161

1865     Graptolithus headi — Billings, pp. 228, fig. 236

1865     Graptolithus headi — Hall, pp. 8, fig. 6:8

1868     Graptolithus (Loganograptus) headi — Hall, pp. 174, fig. 4

1868     Tetragraptus headi — Nicholson, pp. 131

1872     Tetragrapsus headi — Nicholson, pp. 66, fig. 36

1898     Tetragraptus headi — Elles, pp. 486, fig. 11

1902     Tetragraptus headi — Elles et Wood, pp. 59, fig. 5:3a-b

1912     Tetragraptus cf. headi — Hoek, pp. 226, fig. 12:6