PLATE XIX. 



Fig. 1. Squisetites eolumnaris, 'Bvongaisirt. Page 60. [V. 2613a.] 



Fig. 2. Marchantites erectus (Leckenby, ex Bean MS.). P. 51. 



[V. 3662.] 



Fig. 3. Equisetites columnaris, Brongn; P. 60. [40,681] 



Fig. 4. Equisetites columnaris, Brongn. P. 61. [10,379.] 



Fia. 5. Equisetites columnaris, Brongn. P. 58. (From a specimen in 

 the Leckenby Collection, Cambridge.) 



Fig. 6. Ripple-marked shale. P. 48. [40,565.] 



