RAVENHEAD COLLECTION IN THE BROWN FREE LIBRARY AND MUSEUM. 417 



EXPLANATION OF PLATES. 

 Plate I. 



Fig. 1. Catamitina (Catamites) varians, Sternb., var. inconstans, Weiss, nat. size. 



la. Portion of the node showing leaf-scars x 5. 

 Fig. 2. Sigillaria Arzinensis, Corda, nat. size. 



2a. Leaf-scars and portion of rib enlarged 3 times, to show the surface ornamentation. 

 Fig. 3. Sphyropteris obliqua, Marrat, sp., nat. size (type specimen). 



3a. Pinnule x 5, showing the pinnule segmentation and three sporangial bands. 



3b. A sporangial band x 7-^, showing the sporangia placed on oblique elevated ridges. 



3c. A sporangium x 53, showing the terminal depression (pore?) and the cell structure 

 of the walls. 



3d. Another sporangium x 53. 

 Fig. 4. Sphenojiteris coriacea, Marrat, nat. size (type specimen). 



4a, 4&. Two pinnules x 6. 



Plate II. 



Fig. 1. Sphenopteris Marratii, Kidston, n. sp., nat. size. 



la, lb, lc. Portions enlarged 5 times, to show the segmentation of the pinnules. 

 Fig. 2. Sphenopteris Marratii, Kidston, n. sp., nat. size. 



2a. Pinnule x 5. 

 Fig. 3. Splienopteris Footncri, Marrat, nat. size (one of the types). 



3a. Pinnule x 7^, to show the segmentation and nervation. 



3b. Terminal portion of a pinna x 7^. 

 Fig. 4. Trigonocarpus Noeggerathi, Sternb., sp., nat. size. 

 Fig. 5. Neuroptcris dentata, Lesqx., nat. size. (The small stem underneath the pinnule has no 



connection with it.) 

 Fig. 6. Bothrodendron mimotifolium, Boulay, sp., nat. size. Small blanches showing foliage. 



6a. Two leaves x 5, from branchlet marked + on fig. 6. 



