INDIAN JUEASSIC GYMNOSPEEMS. 



83 



Pig, 10. Collodion-film taken from the nnder surface of a pinna of PtiJophyllum cutchense, indicating 



a^ the elongated epidermal cells marking the course of a vein; and b, the shorter cells 

 between the veins, x 110. 



11. The same, indicating a probable stoma-opening, a, with its surrounding cells. X 350. 



(Cf. fig. 13.) 



12. Macrozamia coraUipes^ a portion of the lower cuticle, showing a stoma-openlng, a^ and the 



surrounding cells, x 350. (For comparison with fig» 11.) 



13. Diagrammatic representation of the petiole shown on PL 9. fig- 7. Note the arrangement of 



the bundles, outlining a U, with the xylem (shaded) directed inwards, x 20. 



14. Scar of the stem shown on PI. 9. fig. 4 (see a), a, moulds of bracts surrounding the scar 



[cf. fig. 15 a). Nat. size. 



15. Longitudinal section through the block^ immediately to the left of the scarred stem shown in 



fig. 14, showing a, the moulds of the bracts surrounding the scar; b, the transverse 

 sections of the bracts; c, matrix with petiole and pinna sections. Nat. size. 



16. Williamsonian stem of Block I., leaf-bases. Note the indications of a '' packing" between the 



leaf-bases. Nat. size. 



17. The same, a and h, two views of a large weathered leaf-base; c, a leaf-base in the matrix^ 



broken transversely. Note in each case indications of the presence of seven vascular 

 bundles, and cf. fig. 18 and PL 9- fig. 8. a and b, nat. size ; Cj X 6. 



18. The same, showing, somew^hat diagranimatically, transverse sections of leaf-bases with 



indications of ramental hairs separating them. X 4. 



19. 



Coniferoc anion stem shown on PL 9. fig. 2. Note the 



indications of wrinkling and of elliptical markings. Nat. size. 



Plate 8. 



Fig. 1. Ptilophyllum cutchense, a portion of the frond shown on PL 9. fig. 3 a. Note the impressions 



of the under surfaces of pinnse and their scars of attachment on the rachis, x 2. 



2. P. cutchense (see PL 9. fig. 3 d). Upper surface of pinnse. x 2. 



3. P. cutchense^ a frond-apex. Nat. size. 



4. P. cutchense. a, portion of a frond shown on the surface of a block, X 2; i, section of one of 



the pinnse of a, x 50. [Cf 

 icutifolium. Note indications 



X 2. 



tyozamites falcatus^ portion c 

 reticulate venation, x 2. 



of upper basal angle of pinnse. 



of the pinnae and the 



9. fig. 5. a and h, cavities left 



presumably by the non-preservation of the ceatrlpetal xylem and phloem respectively; 



c, supposed centrifugal xylem. x 100. 



8. Part of transverse section of a leaf-base, showing a, epidermis; J, peripheral sclerenchymatous 



layer; c, ground-mass with secretory sacs; J, vascular bundle, x 50. (See PI. 9. 



fig. 8.) 



9. Transverse section of the Block I. Williamsonian stem taken about 1 cm. below scar (see 



9. fig. 4 ^). a, the leaf-bases surrounding the stem. Nat. size. Note that much of 



the cortex and xylem have fallen away from the stem. 



9. fig. 4. Note ap{)arent 



separation of the xylem into rings, a, cortex with secretory sacs ; 5, periderm; c, xylem ; 



/ 



scar. Nat. size. 



