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308 A. W. WATERS ON CHlLOSTOMATOrS BEYOZOA FKOM
such teeth can be detected in the typical C. fossa, but this is excep-
tional.
Loc. Eiyer-Murray Cliffs.
Fig. 3. — Zooecium of Cellepora fossa, var. marsupiata.
(Enlarged 25 diam.)
71. Lektthopoea hysteix, MacG.
Lelcythojpora Tiystrix^ MacGillivray, "Descriptions of I^ew or
Little-known Polyzoa," pt. iii. p. 194, Trans. Eoy. Soc. Yict. vol. xix.
pi. i. fig. 6 ; also pt. yiii. p. 8, pi. ii. fig. 6 (advance copy).
In the growth and the shape of the cells this so much resembles
various Cyclostomata that until sections were prepared I did not
recognize that it was a Chilostoma ; and even after careful examina-
tion the fossil remains very incomprehensible, and further study of
recent specimens is much to be desired. The state of fossilization is
not favourable for studying the minute structure. The zooecia, which
are subtubular, open only on one side of the zoarium, and are erect
and often more or less in bundles, giving the appearance of Frondi-
jpora. The small opening on the side of the aperture which
MacGillivray describes as an avicularum, is only distinguishable in
a few cases. On the front of the zoarium there are a number of
globular mamillations, sometimes with a small opening in the centre.
These much resemble the enlargements on the front of the cell
•which Professor MacGillivray describes as ovicells ; but these
enlargements in the fossil are usually entire, with comparatively
large pores on the surface. The solid under surface of the zoarium
has a few irregularly scattered large-sized pores.
72. Ctjpulaeia CANAEiEifsis, Busk.
Cujoularia ccinariensis, Busk, Q. J. Micr. Soc. vol. vii. p. 66,
pi. xxiii. figs. 6-9 ; Crag Polyzoa, p. 87, pi. xiii. fig. 2 ; Manzoni,
Foss. Ital. Contrib. i. p. 10, pi. ii. fig. 17; Bri. foss. del Mioc.
d'Aust. ed TJngh. p. 24, pi. xvii. fig. 56.
. Memhranipora canariensis, Smitt, Floridan Bryozoa, pt. 2. p. 10,
pi. ii. figs. 69-71.
Specimens from Aldinga have larger zooecia and larger opesial
openings than some recent specimens from Princess Charlotte Bay.
In the recent one the sulcate structure of the under surface is very
marked ; but upon careful examination faint cross-divisions can also