254 Transactions 
Allman describes both P. lagenifera and P. multinoda as having hydro- 
thecal internodes separated by several short ones instead of by a single 
one. I find this character to exist in P. lagenifera as an occasional variation 
only, and it occurs irem а n P. setacea and Р. caliculata. The descrip- 
two near ends of pude: ibteitbder. These ee 5 pier interior 
of internodes, have been mistaken for real d multinoda 1s, there- 
fore, only P. setacea with well-marked septal ridge 
Here and there, however, in all these species the intermediate internode 
may be divided by real nodes into two or more shorter ones, and in P. setacea 
I have seen as many as four of these together, only one of them bearing a 
sarcothec 
"нер examples of P. setacea are in this collection, mostly from 
Lyttelton ; one from Sumner had hydrothecae slightly larger than the 
others. Also recorded from Timaru y Hilgendorf, from . Sumner by 
Hartlaub, from Quail Island by Chilton, and from Tauranga by Allman. 
Professor Chilton's Sumner specimen, which is of somewhat larger propor- 
tions throughout than typical forms, corresponds exactly with that which 
I formerly described as P. turgida, and which was among von Lenden- 
feld’s types in the Australian Museum, labelled * P. aglaophenoides" ; it. 
came from Lyttelton. 
Plumularia setacea var. opima n. var. (Fig. 11, c.) 
This form resembles P. setacea in its aren characters, but is of 
larger proportions throughout than typical forms. Hydrothecal inter- 
nodes are swollen out more abruptly below hydrothecae, as in P. lagenifera, 
but the latter are not, as in that species, as wide at base as at summit. 
Internodes of hydrocladia are very stout in proportion to length, the 
intermediate ones especially being often nearly or quite as wide as long, 
but they are rounded off at ends to a small diameter, so that nodes are 
very deeply constricted, a feature which gives the variety a characteristic 
appearance. 
Gonangia large, and borne profusely at bases of hydrocladia through- 
out ве part et the colony. The only complete specimen was about 
y 
s cs Morris. de eer also from Dunedin, are in Professor Chilton’s 
collection. 
Plumularia wattsi Bale. (Fig. 12.) 
Plumularia wattsii Bale, 1886, p. 95. 
P. wattsi has not been recorded since I described it in 1886 from Port 
Phillip, and another specimen given to me by the late Dr. MacGillivray 
was probably from the same e In Professor Chilton’s collection 
are fragments from Port mers. 
My original specimen was a obon lOin. high, and was incomplete, the 
upper portion having been torn off, and replaced by irregular regeneration- 
growth. The slender monosiphonic stem is divided into internodes of from 
0-7 mm. to 1-5 mm. in length, with an average thickness of about 0- 25 mm., 
the vede and shorter ones interspersed — and each internode 
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