PROF. P. M. DUNCAN ON STREPTELASMA FLETCHERI. WE7E 
beset with rows of rhomboidal scales, a row of scales existing for 
each half of a costa. Thus on Tab. 1. fig. 2, the costae are marked 
with a herring-bone ornament, the axis of each series being along 
the middle of the costae. There is nothing like this in the British 
specimens. ‘The magnified view of the scales, Tab. v. figs. 18-22, 
shows something entirely new. 
The presence of these scales in specimens of corals seen by Lind- 
strom caused him to evolve a new genus, Pholidophyllum, in 1870, 
and from the synonymy it was first associated with Cyathophyllum 
Loveni, and not with the form under consideration. 
Puoriornyiium, Lindstrom, 1870. 
Synonymous genera :— 
Triplasma, Lonsdale. 
Scarithodes, Dybowski. 
Acanthocyclus, idem. 
*‘Corallum composite, budding on the quadrisection of the mother 
ealice. Longitudinal plications (coste) of the surface of single 
individuals arranged in pairs, beset with rows of rhombic scales, a 
row of scales for each half of the longitudinal plication. In indivi- 
duals crowded into colonies these scales are wanting. Septa of 
equalsize. Loculi filled with ‘like-formed’ stereoplasma, numerous 
in the midst of the coral, most frequently in regular equidistant 
tabule ”*. 
This generic description, doubtless admirably correct for the forms 
described by Lindstrém from the special area of his researches, will 
not include the British Paleocycl = Cyathophyllum, upon the evi- 
dence which I have had. 
In the Index to the Genera of Paleozoic Corals, by Lindstrom +, 
we find ‘‘Palwocyclus, Edw. & H., 1849, Comptes Rendus, xxix. 71. 
From this genus are to be excluded Pal. Fletcher and P. porcatus. 
P. porpita is the only species as yet known.” In the communication 
to the Royal Society published in the Philosophical Transactions, 
1867, p. 643, the absence of synapticule in Palcocyclus porpita was 
proved, and the microscopic appearances figured. The nature of the 
septal nodules was explained, and it was shown that they did not 
stretch across the loculi as synapticule. I got dissepiments here and 
there. ‘This statement requires refutation by Lindstrom before it 
ean be simply ignored. 
Under the circumstances I retain the species of Palcwocyclus in 
the genus Cyathophyllum, and consider that Pholidophyllum is a 
genus whose diagnosis does not cover the English forms. 
* T have to thank Mr. Percy Sladen, F.G.S., for this translation. 
Tt Communicated to the Royal Swedish Academy of Sciences, May 8, 1883. 
Q.J.G.8. No. 157: N 
