File:The Quarterly journal of the Geological Society of London (13889800459).jpg

ALDINGA AND THE RIVER-MURRAY CLIFFS, SOUTH AUSTRALIA. 307
hoc. Living : Off Cape York, lat. 10° 30' S., long. 142° 18' E.,
8 fathm. .B.)\ Semaphore, Adelaide .A. W. IV.). Fossil: Aldinga,
Eiver-Murray Cliffs (dome-shaped and iucrusting) ; Yorke's Penin-
sula (irregular cone-shaped) ; Waiimkerau (New Zealand).
69. Cellepora fossa, Haswell, Waters, Quart. Journ. Geol. Soc.
vol. xxxvii. p. 343, pi. xviii. fig. 89, and vol. xxxviii. p. 275.
From the River-Murray Cliffs there is a specimen about 25 millim.
in diameter, with the one surface, which may be called the under
surface, flat ; the other is slightly rounded. On the flat surface
there are about forty well-marked pits and a few smaller ones.
Fig. 2. — Zooecium o/CeUepora fossa. (Enlarged 2o diam.)
Mr. Haswell, in a " IS'ote on a curious instance of Symbiosis " (Proc.
Linn. Soc. N. S. Wales, vol. vii. 1882), refers to his discovery of
small red Actinids lodged in cylindrical pits in recent Cellepora, and
he attributes these pits in C. fossa to a similar parasite. It is
therefore extremely interesting to frequently find similar pits in
fossil Celleporce. Mr. Busk refers to a perforation two thirds through
C. tubulosa, a fossil from Australia, which, however, cannot be
identified, as the description only takes cognizance of the mode of
growth.
The straight edge of the aperture is irregularly rough, but there
are no teeth.
Loc. Living : Holborn Island. Fossil : Curdles Creek, Mt. Gam-
bier, River-Murray Cliffs, and Aldinga.
70. Cellepora fossa, Hasw., var. marsupiata, nov.
Zoarium subglobular (6 millim. diam.), with a central pit as in
0. fossa. In the typical C. fossa, the avicularium is very large,
often nearly as large as the oral aperture (fig. 2), so that in badly pre-
served specimens the appearance is of one large round aperture
with a bar across. In the present variety the avicularium is much
smaller, with the avicularian chamber raised, forming a kind of
pouch with a semicircular aperture (fig. 3). Surface granular. The oral
aperture (0' 1-0*12 millim.) is narrower than in C. fossa but is pro-
portionately longer ; inside the aperture directed downwards, towards
the interior of the zooecium, there is a tooth on each side of the
aperture, and sometimes these teeth are continued as a plate round