[452] Kidston (86) A. p. 186.
[453] Brongniart (37) Pl. CL. fig. 1.
[454] Brongniart (22) A. Pl. XII. fig. 3.
[455] Sternberg (23) A.
[456] Goldenberg (55).
[457] Zeiller (88) A. (S. elegans).
[458] Goldenberg (55).
[459] Renault (96) A. Pl. XXXV.
[460] Stur (75) II. A. Pl. XLII.
[461] For an account of the various external features made use of in the classification of Sigillarias, see Koehne (04).