References
- Introd , 305 – 305 .
- In Belcher's Arctic Voyage 1855 ii 380 380 pl. xxxvi. figs. 1–3
- 1872 . Ann. & Mag. Nat. Hist. , x : 258 – 258 . ser. 4
- Geol. Mag. , ii 532 – 532 . decade iipl. 13. fig. 6, a–c.
- 1876 . Paper not yet published in full , June 7
- Introd. Foram. , 306 – 306 . and Monthly Micr. Journ., April 1, 1870, p. 182