On the Geographical Distribution of the Cetacea. 387 
ene and hence that no septate coral can be referred to the 
y 
The affinities of Favositipora with Favosites, on the one 
hand, and Alveopora, on the other, also demonstrate that 
the recognition of the Tabulata and Perforata as two widely 
separated sections must now cease to be defensible, the first- 
mentioned genus showing how A the one group 
merges into the other, 
alæozoic epoch were bruno e gia and ee deve- 
or tabulate Alyeopora. In Paleozoic times there existed a 
coral Lact identical with it, and a number of others 
closely allied a ssessing ina s still greater degree of deve- 
lopment this more highly differentiated character. 
wo plates accompanying this arise are prepared from 
the dea hotographs executed for aris, the first 
one representing the coral of the Puis size, pei Pl. XVIII. 
illustrating a portion of the reverse side of VIL, consider- 
ably enlarged. As an experiment, they are gh) successful, 
and promise much for the future of photo-lithography as applie 
to the representation of objects of natural history ; at the same 
time, neither the tabulate arrangement nor the essentially 
tétosulir character of the sclerenchyma are evidenced so con- 
ieuously as in the original photographs. InPl. XVIII, on the 
left-hand side the letter æ is placed opposite an extraordinarily 
large calyx (about half an inch from the margin), in which a 
abula has been fractured across its centre, leaving the larger 
half of the calyx entirely open. Recognizing this, it will be 
easy to detect where the tabulæ occur or are absent in the 
remaining portion of the plate, 
XXXVIIL— 77e Geographical acer gee +g the Cetacea, 
By Dr. J. E. Gray, F.R. xo 
payer i yds and Magazine of Natural History, mee I have 
combined these, En with the materials I have been able 
to collect from various travellers and other scientific writers on 
Cetacea, in the * Catalogue of Seals and Wh se wu en. 
