References
- 1867 . Description of Pygopterus Greenockii, Agass., with Notes on the Structural Relations of the Genera Pygopterus, Amblypterus, and Eurynotus . Trans. Royal Soc. Edinb. , xxiv : 701 – 713 . pl. xlv.
- Poissons Fossiles , ii 78 – 78 . pt. 2
- Poissons Fossiles , ii 76 – 76 . pt. 2
- Poissons Fossiles , ii 74 – 74 . pt. 2
- Poissons Fossiles , ii 77 – 77 .
- Egerton , Philip . 1864 . Quart. Journ. Geol. Soc. London , xx : 3 – 3 . in
- Egerton , Philip . 1864 . Quart. Journ. Geol. Soc. London , xx : 3 – 3 . and pl. i. figs. 2 & 3.