Dublin Microscopical Club. 123 
Measurements.— 
Skeleton-spicules— micromillim. 
JOGA ci Ge Ae ere ee MEAP E77 140 
IPHICKMESS HS Had th... Skins ssisiad aeep 14 
Diameter of tubercles .............. 15 
Double whorls, length .............. 33°6 
Length of the teeth (from thecentre).. 56 
PRbielriass OF thesAXIS bas 6 a5 sferw y sieceves 3 
Gemmula-spicules— 
GREEN elas tian en citys wists oe Beaciile oie 5,6 56 
MREICICHE GS? tats ef ccotetshauine nse ee alts 4 56 
As, from the absence of amphidisks or rudimentary amphi- 
disks, the genera Meyenia, Tubella, and Parmula are excluded, 
and all the species of Spongilla in the restricted sense possess 
pointed skeleton-spicules, excepting only S. nztens (cf. Carter’s 
synopsis, /. c.), our second form must without doubt be regar- 
ded as a new species, which, in honour of its discoverer, shall 
be named Spongilla (s. s.) Béhmit (Zool. Museum, Protozoa 
no. 811). 
PROCEEDINGS OF LEARNED SOCIETIES. 
DUBLIN MICROSCOPICAL CLUB. 
May 18, 1882. 
Nephrocytium Agardhianum, Nag., and Zoospores.—Mr. Archer 
showed examples of the two minute Algxe, Nephrecytium Agardhia- 
num, majus et minus, Nigeli, and remarked that he thought these 
two forms very distinct indeed, dwelling at the same time on their 
resemblances and distinctions as regards the genus Oecystis, Nig. 
But he was on the present occasion more particularly anxious to 
draw attention to examples of the former, which he would be dis- 
posed to designate only Nephrocytium Agardhianum (and the smaller 
Nephrocytium minus), inasmuch as it (NV. Agardhianum proper) 
showed a zoospore condition. An example was now under the 
microscope, in which the four elliptic, necessarily comparatively 
large, biciliated zoospores were still contained in the parent cyst, 
within which they performed a lazy side-to-side movement. On 
their escape, however, into the surrounding water their movements 
become greatly accelerated, and they dash about with great force 
and, as it were, recklessness, hither and thither. Considerable dif- 
ferences of size were apparent, some being nearly twice as large as 
others. Mr. Archer would suggest that this might be due to whether 
an average example became divided into four or eight subdivisions ; 
Oe 
