ia 
“Contributions to the Actinology of the Atlantic Ocean.” 367 
the wall, and Pourtalés distinctly denies the existence of 
an epitheca. Lindstrém’s drawing of a calice does not 
correspond in a very important character with the photo- 
graph of Pourtalés. There are no septa in Lindstrém’s 
figure (pl. u. fig. 27) in the position of the primaries of 
Pourtalés, and what are marked primaries by Lindstrém are 
the secondaries of Pourtalés. Lindstrim, however, states 
that there are six primaries, twelve secondaries, and six 
tertiaries. The coral is most carefully described by our 
author, and the discrepancies are perfectly incomprehensible 
and inexplicable. Nothing can be more interesting to 
zoophytologists than Lindstrém’s remarks on the stereo- 
plasma of this coral, on the prolongation of the ornamental 
granules to form false synapticula, and on the nature of the 
septum. 
Lindstrém combats the teaching of Milne-Edwards and 
Jules Haime that each septum consists of two lamine. He 
believes that the dark irregular central line seen in sections is 
the primary condition, and that the thick calcareous substance 
on either side is superadded—that really three and not two 
structural elements exist. He candidly admits that the two 
laminz are to be seen in some fossils. They are visible 
enough in many recent forms; and in some Australian fossil 
forms where the costa does not correspond with the septal end, 
and this is continuous with the intercostal median line, the 
line which separates the septal lamine is singularly distinct. 
In investigating this matter [ find that the centre of the 
recent septum has more connective tissue than the laminz on 
either side; and this can be well made out by treatment with 
acid—the ultimate microscopical structures radiate often from 
the central plane. That Lindstrém is right about the central 
line being anterior to the rest is beyond a doubt, but I do 
not find that it was a lamina for all that. 
The splitting of the parent by an internal bud, noticed 
probably in the first instance by Savile Kent in a Flabellum, 
does not appear to be the phenomenon observed in Schizocya- 
thus according to Lindstrom. He points out that “it is not 
a gemmation, but an interrupted and then continued growth 
of the same individual.” He instances similar processes of 
growth in Flabellum laciniatum and Diaseris crispa. Now 
Pourtalés states that the budding takes place on the secondary 
septa in the calice; and it must be confessed that although 
Lindstrém’s figure (pl. in. fig. 29) looks like what has re- 
cently been called rejuvenescence, and has been known for 
a generation as growth after arrest, the appearance of figs. 28, 
30, and 31 favours the opinion of Pourtales. 
