References
- See Brit. Silurian Brachiopoda 34 34
- Cuvier . 1802 . Mémoires du Muséum , i : 69 – 69 . in the
- It will be seen by a reference to the American Journal of Science 1870 1 103 103
- see American Journal of Conchology vi 157 157 pl. viii. fig. 2)
- King . Monograph of Permian Fossils pl. xx. fig. 7
- British Silurian Brachiopoda pl. iii. figs. 5 & 6
- British Silurian Brachiopods pl. xxix. fig. 20, pl. xxxiv. fig. 16, pl. xxxv. fig. 12
- Dvidson . Introduction to Fossil Brachiopoda pl. viii. figs. 187 & 188
- King . Monograph of Permian Fossils pl. xix. fig. 2.2
- Davidson . Monograph of British Silurian Brachiopoda pl. xxxvii. figs. 25 & 26
- Introduction to Fossil Brachiopoda pl. vii. fig. 133
- Monograph of Permian Fossils pl. xx. figs. 6 & 7
- Monograph of Permian Fossils pl. viii. figs. 6 & 7
- Monograph of British Silurian Lingulæ 43 – 43 . pl. i. figs. 2 & 3