Plant Impressions or Incrustations. 391 
Wills, Lucy ( 1914 ) : Plant Cuticles from the Coal Measures of Britain. Geol. Mag., N.S., 
Decade VI, vol. i, September. 
WlMAN, C. ( 1895 ) : (i) Uber die Graptoliten. Inaugural-Dissertation, Upsala. 
-: (ii) Sonder-Abdruck aus Bull, of the Geol. Inst, of Upsala, No. 4, vol. ii, 
pt. ii. v 
Explanation of Figures in Plate IX. 
Illustrating Mr. Walton’s paper on Fossil Plant Impressions or Incrustations. 
Dadylotheca plumosa , Artis sp. 
Fig. 1. Photograph by reflected light of a transfer preparation, showing the hairy under surface 
of the frond. The hairs can be seen most clearly at a. x 3*1. 
Mariopteris , cf. inuricata, Schloth. 
Fig. 2. Photograph by reflected light of a transfer preparation. The shale (white in the photo¬ 
graph) has not been etched away completely in order that the glandular hairs, h, may be shown 
projecting through it. x 2. 
3. Photograph of upper cuticle. The outlines of the epidermal cells can be seen. Glandular 
hair-bases at h and h'. Microspores can be seen sticking to the surface, x 60. 
Fig. 3 a. Photograph of upper cuticle with adherent microspores, x 230. 
Fig. 4. Photograph of lower cuticle. v, small folds in the cuticle marking the courses of 
the veins ; p, groups of papillae on the epidermal cells surrounding each stoma, x 60. 
Fig. 5. Photograph of a glandular hair situated at the edge of a fold in the cuticle. It is thus 
seen in profile. Note the microspores sticking to the cuticle near the hair, x 83. 
Fig. 6. Photograph of one of the stomata on the under surface. Note the papillae, in this 
example five in number, which surround the stomatal depression in the epidermis. The guard-cells 
of the stoma itself are at a slightly lower level and can be seen within the ring formed by the 
papillae, x 440. 
Cladotheca undans , (Halle) Lind, and Hutt. sp. 
Fig. 7. Photograph by reflected light of a transfer preparation showing the fertile lower surface 
of a portion of a frond. The linear sori with densely packed sporangia can be distinguished. X 2*4. 
Sphenopteris nummularia , Andr. 
Fig. 8. Photograph by transmitted light of a transfer preparation of a portion of a frond. 
a, the vascular strand of the rachis ; b, the vascular strand passing out to the lateral; c , incurved 
margin of pinnule, x 3-3. 
Fig. 9. Photomicrograph of a stoma with the outlines of the surrounding epidermal cells, 
x 400. 
Oligocarpia gutbieri , Gopp. 
Fig. 10. Photograph by transmitted light of a transfer preparation showing sterile (a) and 
fertile (bb) pinnules, x 3-2. 
Fig. 11. Photomicrograph of three sori. a, annulus ; v, vein to sorus; w, main vein of pinnule. 
x 60. 
Psilophyton princeps , Dawson. 
Fig. 12. Photograph, partly by transmitted, partly by reflected light, of a transfer prepara¬ 
tion. a, one of the spines on the surface of the preparation; b , spine exhibiting the basal expanded 
portion. x 3. 
Fungus (spore-form, cf. Dematiaceae). 
Fig. 13. Photomicrograph of a transfer preparation showing mass of septate spores, x 250. 
