ERRATA. 



The reader is requested to substitute the following explanations of the Plates, for those given 

 in No. 15, pp. 378, 379. The explanation of the Plate of " Didymoplexis," page 383, then 

 omitted, is likewise added. 



Agrostophyllum Khasiyanum. 



1. Stem of a Plant about the natural size. 



2. One of the peduncles bearing two flowers. 



3. Flower viewed posticously. 



4. Front view of column. 



5. Apex of the same, anther-case removed. 



6. Lateral view of column, anthers removed. 



7. Front view of the same. 



8. Long section of the column. 



All but fig. 1 more or less magnified. 

 Appendicula LewisiL 



1. Stem of a plant, natural size. 



2. Flower, lateral view. 



3. The same, one lateral sepal removed. 



4. Back view of column. 



5. Lateral view of the same. 



6. Anthers underface— pollen masses partly disclosed. 



7. Pollen masses and gland. 



8. Lateral view of column. Anthers removed. Gland remaining in situ, 



9. Back view of column. Anther pollen masses and gland removed. 

 10. Front view of the same. 



Didymoplexis pallens. 



1. Plant, natural size. 



2. Lateral view of fiower. 



3. Front ditto. 



4. Lateral view of column and labellum. 



5. Lateral view of column. 



6. Apex of column in front. 



7. Anthers under face. 



LIST OF PLATES IN THE FOURTH VOLUME. 

 Plate I. — Ophiopsis procerus, Agassiz. 



Il.—Thrissops intermedins, V. Miinst, p. 77. 

 III. — PhoUdophorus lotus, Agassiz, p. 76. 



V. — Bapedius Colei, id. 



VL— Robinson's Patent Sugar Mill, p. 124. 



IX.— The head of a Fossil Fish, p. 83. 



* Erratum ; line 1 , page 372, for Plate xiv. read Plate xi. 



