358 Transactions.— Botany. 
I found this Diatom in quantities during the months of April and May, 
in a spring at Ngapari on the side of North Moeraki Downs, facing the river 
hey. 
I am indebted to Professor Hutton for the verification of this descrip- 
tion. 
Plate XXII, fig. 1: a, front view; 6, suture; c, side view. 
On the Identity of Amphicampa with Himantidium, and Description of a new 
Species. 
[Read before the Philosophical Institute of Canterbury, 4th August, 1881.] 
Axzour four years ago I found, quite accidentally, in a drain in the Cust 
Valley swamp a small pocket of diatomaceous earth, which on examination 
much resembled Amphicampa mirabilis, Ehr., described in the Micrographical 
Dictionary as a doubtful genus of fossil Diatomacee. ‘The other species 
named is 4. eruca, and both are represented as found fossil at Tizar, 
Mexico. 
Professor Hutton found fossil valves in Waikato and elsewhere, and 
Mr. George Gray recognized them in gatherings taken from the River 
Avon. 
In the month of May last I gathered a considerable quantity of a 
filamentous Diatom from a spring at Ngapari, Fernside, which, after treat- 
ing in various ways, I resolved into the hitherto so-called genus Amphicampa 
(both sides sinuated). That genus, however, appears to have been con- 
sidered ‘‘ free,” while in the form which I gathered it is filamentous, and 
cannot be separated generically from Himantidium. The present species is, 
however, certainly not A. erwea; and as A. mirabilis is figured with % bends, 
while my species varies from % to $, I assume it to be a new species. 
Hinaasttion maskellii, sp, nov. 
Frustule: front view rectangular ; length about four times the breadth, 
straight, forming a lengthened tenacious filament, showing lines of dots at 
the points of suture corresponding to the strie on the side view. Valve: 
elongated, slightly arcuated, and attenuated towards the extremities, which 
are boldly rounded ; both edges are sinuated; length about seven times 
the breadth. The convex edge has invariably one more bend than the con- 
cave. The valves ‘vary in the number of the bends from ¢ tog. Strie: 
parallel and transverse, and there are 23 to 27 to the -001 of an inch. 
Hab.—Ngapari, Fernside, and River Ayon, North Canterbury; War 
kato and Cabbage Tree Swamp, Auckland (fossil) Hutton; Cust Valley 
Swamp, North Canterbury (fossil). 
Plate XXIL., fig. 2: a, front view filamentous; ¢, side view. 
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