BY F. E. BURBTTRY. 5 



the collector. Lower down the Tamar, in the ti-tree swamp, 

 a remarkable form is met Avith in Nitzchia clevei, a form 

 which would seem to bo almost unknown to the Old 

 World. It can hardly be missed, its great length being in 

 striking contrast to other species. Here also I have located 

 Van Heuxtzia vulgare and a beautiful Stauroptera. At 

 G-eorge Town and the Heads no less than 37 species are 

 found, and these by necessary imperfect gatherings. The 

 most striking frustules are those of Khabdonema Adriatioum, 

 which are very plentiful. Pleurosigmas decorum, formosum, 

 latum, and strigalis, and a more or less rare and un- 

 known variety are also found in company with Triceratium 

 fimbriatum and a very large and very rare valve of 

 Mastogloia species. Closely allied in their general forms 

 are those gathered at Cornelian Bay, Hobart, the same 

 Mastogloia being located, as also Eunotia transylvanica, 

 the latter of which, however, I am unable to find 

 in my George Town gatherings. I have also found 

 some fourteen varieties at Prospect in an intermittent spring 

 of hard water. These call for no special comment, except 

 that, speaking broadly, they tend to ally themselves more to 

 the marine forms than to those usually found in fresh water 

 gatherings. Photo-micrographs of the more important and 

 interesting forms have been taken. In conclusion, may I 

 solicit the aid of members of the Society in this work. 

 Grreen or yellow confervse scraped from piles of wharves or 

 floating buoys, or from stones, etc., at low tide contain many 

 forms, and need only be sent on to me in a rough state. 



Tasmanian Diatomaceof. 



Actinocyclus Barkleyi. 522. Grun. Inveresk, N. Esk, 

 Hobart, Depot, Ti-tree. 



Achnanthes salina. Kiitz. N. Esk, Depot. 



Achnanthes longipes. 279. Agvar. Hobaxt. 



Achnanthes exilis. 282. Kiitz. Prospect. 



Achnanthes pusilla. Grun. George Town, Low Head. 

 Rare. 



Achnanthidium lanceolatum. 276. Breb. Hobler's, N. Esk. 



Amphora acutinscula. 134. Kiitz. George Town. Un- 

 common. 



Amphora marina. 129. Wm. S. Low Head. Uncommon. 



Amphiphora lepidoptera. 263. Greg. Low Head. Rare. 



Actinoptcychus splendens. Ralfs. N. Esk. 



Auliscus sculptus. 482. Ralfs. Hobart. 



