the Embryos and Seedlings of the Cactaceae . 473 
EXPLANATION OF FIGURES IN PLATE XXVI. 
Illustrating Professor Ganong’s paper on the Cactaceae. 
All figures drawn from nature with camera lucida. The species of Pereskia 
and Opuntia are natural size ; all others are two and a half times natural size, 
unless otherwise explained. Letters a, b , c designate different views of the same 
specimen. Average specimens were always selected for drawing. 
Fig. 1. Pereskia aculeata. 
Fig. 2. Opuntia bernardina : c, cross-section of cotyledon X5 ; d, do. of hypo- 
cotyl x 5 ; e, specimen from which buds were removed, and which had grown to 
double size. 
Fig. 3. 0 . echinocarpa : c, specimen bearing a bud in the fork near the tip 
of a cotyledon. 
Fig. 4. 0 . basilar is ramosa. 
Fig. 5. 0 . vulgaris : c, cross-section of cotyledon x 5 ; d, do. of hypocotyl x 5. 
Fig. 6. 0 . Ficus-indica. 
Fig. 7. 0 . Engelmanni occidentalis. 
Fig. 8. Cereus Thurberi. 
Fig. 9. Cereus giganteus. 
Fig. 10. C. peruvianus. 
Fig. 11. C. Hystrix. 
Fig. 12. C. Bonplandi : c, older specimen showing removal of axillary buds 
away from epicotyl. 
Fig. 13. C. Martianus. 
Fig. 14. C. grandifiorus. 
Fig. 15. C. nycticaulis. 
Fig. 16. C. spinulosus. 
Fig. 17. C. triangularis : c, specimen issuing from seed to show hair-collar and 
basal swelling x 5 ; d, older specimen to show do. X 5. 
Fig. 18. Phyllocactus Ackermanni. 
Fig. 19. P. anguliger. 
Fig. 20. P. phyllanthoides grandifiorus . 
Fig. 21. P. Phyllanthus : b } younger specimen ; c, d, older specimen. 
Fig. 22. Pilocereus Houlletii. 
Fig. 23. Cephalocereus senilis. 
Fig. 24. Echinocereus pectinatus rigidissimus. 
Fig. 25. E. phoeniceus . 
Fig. 26. E . Engelmanni. 
Fig. 27. E. procumbens. 
Fig. 28. E. tuberosus . 
Fig. 29. Echinopsis Zuccariniana. 
IC k 1 
