2 Mr. A. W. Waters on Australian Bryozoa. 
fication of Smitt¢a and the allied genera as Mucronella and 
Porella has never seemed to me satisfactory. On this account 
comparative drawings of the apertures of a series are given. 
Until the weak points in our present classification are 
weeded out but slight progress can be made in our knowledge 
of geographical distribution, and all complete descriptions and 
working out of structures are helping towards this, while 
premature alterations are to be avoided. 
In Schizoporella as now understood there are a number of 
forms with the true aperture emarginate and having a distinct 
sinus, such as S. Ceeilii ; then there are others where the lower 
part of the aperture is subtriangular, with lateral denticles, 
such as S, lata, MacG., S. ambita, W., &c., and these should 
probably be separated. 
Since my last paper Mr. Whitelegge has published an 
important communication on some Australian Bryozoa*, 
dealing principally with the Lunulites group, and it is to be 
hoped that he will continue to use his opportunities to add to 
our knowledge of the structure of the Australian Bryozoa. 
Mr. Whitelegge has favoured me with further specimens of 
“Flabellopora”’ elegans, d’Orb., and I feel no doubt as to the 
correctness of my identification. Probably Mr. Whitelegge 
will not mind my pointing out a fact of which he is now 
aware, namely that d’Orbigny only described Flabellopora 
elegans as recent and not fossil. 
T have been informed that the locality mentioned (‘ Annals,’ 
1887, xx. p. 193) as Raton, New Guinea, should be Katow, the 
manuscript label with the specimen having been misread. 
In my Supplementary ‘ Challenger’ Report Letepora jack- 
soniensis, B., and &. victoriensis, MacG., are united. 
Membranipora corbula, Hincks. 
This species, mentioned in my previous paper, also occurs 
from Green Point. Thereis great variation in the size of the 
oral spines, so that sometimes the difference is not very marked 
between these and the spines over the front of the zocecium. 
The ovicell is frequently umbonate—in fact it may sometimes 
be described as aspinous umbo. I have a badly preserved 
specimen among some things from New Zealand (probably 
Napier), and in this the ovicell is also umbonate. I. corbula 
and JM. armata are so similar that it may be doubted whether 
they are more than two extreme forms of the same thing. 
* Proc. Linn. Soc. N. S. Wales, ser. 2, vol. ii. p. 337; also reprinted 
in the ‘ Annals,’ ser. 6, vol. i. p. 18. 
