BRYOZOA FROM AUSTRALIA. 683 
1. Crista unrpora, d’Orb. Pl. XXX. fig. 1. 
Idmonea unipora, d’Orb. Pal. Franc. p. 737, pl. 613. figs. 1-10. 
Crisina unipora, @ Orb, Prodr. p. 265. 
Crisina elegans, VOrb. Pal. Fr. pl. (only) 613. 
A specimen from Curdies Creek is undoubtedly the same as d’Or- 
bigny’s, though a trifle larger, nearly 3 of a millimetre, instead of 4, 
and the zocecial tubes project rather more. Whether this is to 
belong to Idmonea, Filisparsa, or Crisia is very doubtful. The 
puncturing is the same as that of some Crisiw from the same locality, 
but the distance apart of the zocecia is about double as great as we 
find in most recent Crisiw, in which it is usually only a little greater 
or less than 0°25 millim., though in Crista cornuta the distance is 
sometimes as great as in the fossil, in which it is about 0'45. On 
the other hand, the closure of the zocecial tube is terminal, whereas 
in Filisparsa and Idmoneca it is a little distance down the throat of 
the zooscial tube. If it is to be looked upon as a Crisia, then it is 
interesting to find it unjointed; but if it is considered a Mihsparsa, 
then it is interesting to find the regularity of a Crisia. Width of 
zocecial aperture 0:1 millim. 
Loc. Senonien: Fécamp (Seine-Inf.); Vendome (Loir-et-Cher) ; 
Curdies Creek, Australia. 
2. IpmMonza atiantica, Forbes. 
Idmonea radians, V. Ben. (non Lamk.) Bry. de la Mer du Nord. 
Bull. Brux. xvi. pt. 2. p. 646, pl. 1. figs. 4-6. 
Idmonea mconstans, Stol. Foss. Bry. Orak. Bay, p. 116, pl. xviii. 
figs. 7, 8. 
For synonyms see Hincks, Brit. Mar. Polyz. p.451, pl. Ixv. figs. 1-4. 
The distance of the series of zocecia apart is from 0°6 to 0:8 millim., 
which is about the same as figured by Smitt (Krit. Fort. pl. iv.). 
The main character seems to be that the zocecial openings are all on 
the upper part of the branches, so that at each side the lower part 
is without zocecial tubes. There are some stouter fragments which 
at first I thought should be called J. serialis, Stoliczka; but it seems 
as though they should only be considered a stouter variety, and 
perhaps may be /. australis of MacGillivray and J. lineata of Hage- 
now and Manzoni. I do not see that I. communis (d’Orb. pl. 750. 
figs. 6-10) differs in any structural particular from the present 
species. 
In a specimen from Bairnsdale the ovicell which occurs near the 
bifurcation is elongate-pyriform, embracing the zocecia, about 1°5 
millim. long, and the position of the ovicell is the same in the typical 
I. atlantica and the stouter variety. 
Loc. Living: Arctic and European seas; North Atlantic; Florida 
(Sm.); Madeira (/.). Fossil: Miocene, Hisenstadt, Steinabrunn, 
(Manz); Astian and Sicilian of Sicily (Seg.) and Pruma (A.W.W.); 
Canadian Postpliocene (Dawson); Orakei Bay (Stol.); Curdies Creek, 
S.W. Victoria ; Mount Gambier, Bairnsdale. 
