Cystophora, Phyllospora, Ecklonia, Sphacelaria, Champia, Amphiroa, 

 Melobesia, Plocamium, Iridsea, Ballia, Griffithsia, Caulerpa, Conferva 

 (Chaetomorpha) and some other genera. Of Fungi none are contained 

 in the collection. A comparison of the plants of the Chatham-Islands 

 with those of New Zealand, as far as they are known to the author, 

 has proved, that only 9 phanerogamous species are peculiar to the 

 former, and even of the specific validity of some of these we are not 

 finally assured. Eight of these seemingly endemic plants are referable 

 to the genera Coprosma, Gingidium, Eurybia, Senecio, Leptinella and 

 Myrsine, whilst only one (Myosotidium nobile) constitutes a genus 

 peculiar to the islands. As all the other genera are represented in 

 the vegetation of New Zealand, we are warranted in regarding the 

 flora as merely an extension of that of the great neighbouring group, 

 the territory of which may indeed at one period have stretched unin- 

 terruptedly across, a supposition strengthened by the fact of navi- 

 gators having obtained soundings throughout the interjacent sea. 

 This persuasion impresses itself the more forcibly on the mind of the 

 observer, if he contrasts the Chatham-vegetation with that of Raoul- 

 Island, imperfectly as it is known (conf J. Hooker in Proceed. Linn. 

 Soc. i. ]25) and more particularly with that of Norfolk-Island and 

 of Tasmania, certain points of all these isolated spots being nearly 

 equidistant from New Zealand. Little in the vegetation of the 

 Chatham-Islands is strikingly peculiar, except the Myosotidium and 

 the grand arborescent Compositse (Eurybia Traversii and Senecio 

 Huntii), which add two singular forms to the very limited number 

 of such plants of this extensive order as rise to the height of trees ; 

 such also elsewhere occur chiefly in insular localities. Of the phane- 

 rogamic plants of the Chatham-Islands 24, and of the ferns 6, are 

 otherwise restricted to New Zealand. Other 11 of the di- or mono- 

 cotyledonous plants and seemingly 6 of the ferns are common to New 

 Zealand and Australia or some of the adjacent islands, whilst 12 of 

 the phanerogamic plants (the introduced ones excluded) and as many 

 of the ferns are more or less widely dispersed over the globe. Of the 

 Australian plants, occurring in the Chatham-group, only one, Leuco- 

 pogoD Richei, seems hitherto not observed in New Zealand ; whereas 

 Hymenanthera latifolia, indigenous both to Norfolk- and Chatham- 

 Island, represents in all likelihood but one of the extreme forms of 

 an Australian and New Zealandian species. Tetragonia implexicoma, 



