362 Rev. T. Hincks on the Genus Retepora. 
R. monilifera affords a very striking illustration of the 
diversities in the habit of growth which are so characteristic 
of the present family. So utterly different in aspect are its 
simply caliculate and its convoluted and chambered variety, 
that it is difficult to believe that they are reterable to one 
and the same species. I was at first so completely deceived 
by the very distinctive habit of the latter, combined with 
some other trifling peculiarities, that I had marked it as a 
new species, under the name of Lf. contortuplicata. 
2. Retepora phenicea, Busk *. 
Zoartum of a rich red colour, irregularly cup-shaped, 
variously contorted, the edges of the lamina sometimes uniting 
so as to form cylindrical cavities. Jenestre small, oval, the 
inosculating branches broad and rather massive. Zooacia 
rhomboidal or irregularly ovate, commonly enlarged aboye, 
narrowed downwards, and truncate at the bottom, flat, with 
a conspicuous line and a few very large punctures round 
the edge; surface smooth and polished; orifice orbicu- 
lar ; peristome raised and somewhat thickened, subtubular, 
slightly bent forwards, the margin often serrulate; some- 
times a minute circular orifice in the centre, immediately 
below it; a depression on the front of the cell below the 
mouth, from which a pointed avicularium extends upwards to 
the lower margin. Dorsal surface solid, smooth or minutely 
warty, strongly vibicate, and generally destitute of avicularia. 
Ooecia globose, subimmersed ; surface entire, smooth and 
shining, hollowed out in front, the fissure being filled in by 
a thick opercular plate, which is prolonged below within the 
orifice. 
Locality. South Australia, Adelaide and Glenelg. 
Mr. Busk has characterized R. phenicea with his accus- 
tomed accuracy ; but as his description is very concise, in har- 
mony with the plan of his work, it may not be superfluous to 
furnish a further account of it. 
To the elements of beauty which are common to the tribe, 
the charm of rich colouring is superadded in the present 
species; and its fine red tint is well preserved in fresh un- 
bleached specimens. The cell exhibits strongly marked cha- 
racters, but is subject to a certain amount of variation. The 
subtubular peristome is sometimes wanting, and the orbicular 
orifice, with its slightly thickened rim, is on a level with the 
surface. The edge is often entire and shows no trace of ser- 
rulation. ‘The minute central foramen below the mouth I have 
* Cat. Marine Pol. part ii. p. 94, pl. exxi. figs. 1, 2, 
