THE FOBAMINIFEEA OF LORD HOWE ISLAND. 629 
deeply depressed, showing no sign o£ coiling or o£ an oral aperture. As in 
Spirillina lucida Sidebottom, the oral extremity of the tube is compressed and 
sealed into the outer wall of the test. The protoplasmic body, which is dark 
yellow in colour and full of minute granules of darker tint, is voluminous 
and occupies the whole of the convolutions. 
Spirillina campanula is interesting as presenting an entirely novel plan 
of growth. The genus is normally a plano-spirally coiled tube, but in most 
of the species a certain degree of asymmetry is observable between the two 
faces of the spire, one being raised and the other depressed. This tendency 
is particularly noticeable in S. revertens Rhumbler and S. lucida. Sidebottom, 
and is still more pronounced in S. groornii Chapman, })ut none of these can 
compare with the extraordinary convexity of S. camjxcmda. 
The species is probably abundant at Lord Howe Island, as many specimens 
were found in spite of the very small quantity of fine material available for 
examination. All the specimens were free except one, which was sessile on 
a fragment of coralline. The perfect manner in which the rim of the bell 
with its excised edges adapted itself to the shape of the host suggests that 
such a sessile habitat may be normal, at any rate, up to a stage in the existence 
of the organism. Such conditions would account for the peculiar form of 
the rim and the varying degree of compression of the bell. But a careful 
search of the small quantity of coralline available did not provide further 
specimens. 
One large individual has lost all internal septa by absorption, and the entire 
cavity of the bell is packed with young individuals, each consisting of a 
proloculum encircled by a complete coil of tube. At least ten individuals 
can be counted in the cavity. 
The size and relative proportions are very variable. Five specimens 
measured for height and maximum breadth gave the following measure- 
ments : — 
Height -15 -075 
Breadth -187 -125 
Four others measured gave : — 
Maximum breadth . . 'ISS 
Thickness at rim -107 
Sub-family RoTALiiNiE. 
Patellina Williamson. 
140. Patellina corbugata Williamson. 
Patellina corrugata Williamson, 1858, EFGB. p. 46, pi. 3. figs. 86-89. 
Brady, 1884, FC. p. 634, pi. 86. figs. 1-7. 
Heron-Allen & Earland, 1914-15, FKA. p. 687. 
Common and typical. All of the rather low-domed, scaly type. 
LINN. JOURN. ZOOLOGY, VOL. XXXV. 45 
■15 
•095 
•115 mm. 
162 
•125 
•125 mm. 
■1 
•11 
•095 mm. 
•08 
•087 
■08 mm. 
