138 
Protoeetepora ampla, LonsdaleP 
PL VIII, Pig. 4.'^' 
Fcnestclld ampla, Lonsdale, 1844, in Darwin’s Greol. Obs. Yol. Islands, p. 163. 
,, „ Idem, 1845, in Strzelecki’s Phys. Descr. N. S. Wales and Y. D. Land, 
p. 268, pi. 9, fig. 3. 
„ „ McCoy, 1847, Ann. Mag. Nat. Hist., xx, p. 226. 
„ „ J. D. Dana, 1847, G-eol. Wilkes’ U. S. Explor. Exped., p. 710, pi. 11, fig. 
1 (fig. 1 excl.) and pi. 10, fig. 2. 
The coenoecmm is in the shape of a conical vase with a rim more or less 
raised and variously folded. It must have been attached to a straight and 
pointed peduncle; its general appearance decidedly recalls that of many 
Tertiary and living species of Betepora. Just like these the branches of the 
coenoecium are so intimately connected that they form one homogeneous tissue, 
pierced by a large number of oval fenestrules, which, arranged in straight 
lines, often bifurcate, radiating from the peduncle towards the margin. Unlike 
Fenestella the cells are on the internal surface, and three parallel lines of 
them, very small and arranged quincuncially, occupy the free space between 
two rows of fenestrules ; two or three small cells like the first border the 
upper and underside of each fenestrule. Exteriorly the branches are much 
better defined, owing to the slightly rounded form ; their surface is covered 
with a large number of fine, faintly marked, longitudinal striae. 
Dimensions. — The most perfect specimen at my disposal is only three 
centimetres high, with a diameter of from five to seven centimetres at its 
free edges. There are about seven or eight fenestrules in each centimetre of 
length. 
Delations and Differenees . — Of all known species, Frotoretepora 
Halliana, Prout, is that which is most like this one. It differs only in the 
less regular arrangement of its cells. The other species have for the most 
part smaller fenestrules, and a different arrangement of their cells. The 
specimen which Dana figured on his Plate X, fig. 15, and which he has 
doubtfully assigned to F. internata, Lonsdale, appears to me not to differ 
from the specimen I have just described. 
(') { Vide'R. Etheridge, junr., Geol. and Pal. Q’land, 1892, pp. 221-223. Mr. Etheridge describes the 
specimen figured in De Koninck’s Pi. 8, tigs. 5 a — c as P. ampla, var. Woodsii. — W'.S.D.] 
(2) [PI. VIII, fig. 5.— W.S.D.] 
