[912] Phillips (75) A. p. 215.
[913] Seward (00).
[914] Sternberg (38) A. p. 169.
[915] Sternberg (20) A. Pl. IV.
[916] Corda (45) A. Pl. II. fig. 5.
[917] Brongniart (28) A. Pl. XLI.
[918] Feistmantel (72).
[919] Velenovský (88).
[920] Carruthers (65) Pl. XIII.
[921] Heer (75).