II.—BOTA N Y. 
Arr. XXXL—On the New Zealand Desmidiem. Additions to Catalogue 
and Notes om various Species. By W. M. Masgett, F.R.M.S. 
[Read before the Philosophical Institute of Canterbury, 5th Ootober, 1882.] 
| Plates XXIV. and XXV. 
Tre following paper consists of two parts :—First, a list, with descriptions 
and figures, of those plants which I have been able to add to my former 
catalogue ; and secondly, notes upon some of the species described or men- 
tioned in my paper, vol. XIII. of the Transactions, 1880, p. 297. 
Several of the plants given in the following list have come to me in 
gatherings from Hawke's Day, and I must express my thanks to Dr. 
Speneer, of Napier, who has kindly forwarded these gatherings, and in 
other ways materially assisted me. Indeed, strictly speaking, I have no 
right to include these in my paper: but Dr. Spencer informs me that he is 
not able this year to publish them. I understand that he proposes shortly 
to describe several new species in other families of Alga. 
In order to mark the plants so sent to me I have put after each the 
letter S, in all cases where I had not previously found the plant in Canter- 
bury or elsewhere myself. 
I have also to thank Professor Nordstedt, of Lund, for sending me papers 
of his upon Desmidiew and other Algs, which have been of great service ; 
also Mr. Joshua, F.L.S., of Cirencester, England, who kindly sent me, a few 
months ago, a number of tubes containing gatherings of Algæ from various 
parts of England. In these tubes, although I have not yet thoroughly ex- 
amined them, I have found, so far, more than fifty species of Desmidies, many 
of which are uncommon, and all have been of great use to me for comparison 
with the New Zealand forms. 
My works of reference have been increased since 1880 by the addition 
of Rabenhorst’s * Flora Europea Algarum,” Pritchard's “ Infusoria,” the 
 ** Annals and Magazine of Natural History," and others. Examination of 
these has not compelled me to abandon any of the species which I set down 
in my former paper as new, with the exception, perhaps, of Staurastrum 
(Didymocladon) stella and Docidium dilatatum. The former may possibly be 
S. fureigerum or S. sexangulare : the latter is said by Mr. Archer to be pro- 
bably D. ovatum, Nordstedt. 
I have been fortunate enough in the last two years to find some species 
of Desmidieæ in conjugation, with attached zygospores, notably Cosmarium 
