130 DR. LATJDER LIITDSAT ON IS'EW ZEAIiAJSTD DTATOMACE^.. 



III, The proportion of species to a genus is 3G6. 



IV. The proportion of species to a family 9'16. 



My collection of DiatomacesB was made towards the close of 

 1861, in the Greenisland district of Otago, around the station or 

 farm of Fairfield*, SaddlehiU, which formed my head quarters for 

 three months. The speci 



I. The lagoons and marshes of the Kaikorai stream, hetween 



Abbott's Greet Bridge and the sea. These were low and 

 stagnant after a track of dry weather. 



The substances or media in which the Diatoms were con- 

 taiued were chiefly 



a. Mud, from their edges or "bottom, 



J. Scum, including Confervaceous and other vegetation 



from their surface. 



F 



II. Ditches on roadsides in various parts of G-reenisland, espe- 

 cially on the G-reat South' (or Invereargill) Eoad, — the me- 

 dium being, for the most part, mud from their shady sides. 



ni 



foliage. 



urface 



ckled. or which 



Mosses 



Hepaticae. 



Woodburn 



ravines 



Woodburn 



c, Faces of rock at 



1. Coal-pit, Abbott's Creek. 



2. Abbott's Creek Bridge. 



3. Behind Greenisland Church. 



4. In the bushf, Greenisland. 



The Diatoms were generally contained in the slime or 

 vegetation scraped from the rock-surfaces. 



It will thus be seen that the collection was made from a most 

 limited area. It does not pretend to offer a fair representation of 

 the Diatoms, even of Dunedin, the capital of Otago ; far less can 

 it be regarded as typical of Otago or New-Zealand Diatoms in 



* About seven miles southward of Dunedin, on the Great Southland Road, 

 f Colonial or local name for the primitive forest. 



