19G 
vine: polyzoa of the wenlock shales. 
Genus Polypora, M'Coy. Type P. dendroidea M'Coy. 
Genus Phyllopora, King. Type P. ehrenbergii, Geinitz. 
The genus Polypora, so far as I am aware, is not represented in 
British Sihirian rocks, otherwise than by the species P. problematica, 
and I have no record of the genus having representatives in the 
Sihirian rocks of other countries. Our first acquaintance with Phyl- 
lopora is, as a new genus, founded for very pecuhar Permian 
fossils. When compiling my Brit. Assoc. Report, 1881, I was 
allowed to examine the whole of the type species of the so 
called Retepora in the School of Mines, and I was unable to accept 
this genus for any of the Silurian Polyzoa, and the next best asso- 
ciation for the group was in the genus Phyllopora, as founded 
by King. I accepted the term, however, not without compunctions, 
because two good workers, Salter and De Koninck, had consecrated 
the genus for other than Permian fossils. It is impossible, judging 
from King's figures alone (Perm. Foss. pi. v. figs. 1-6) to recognise the 
p. Ehrenbergi, as of the same character as the Silurian fossils which 
bear, or may bear, the same generic term, but the author must be 
credited with a desire to establish the genus both for Permian and 
Silurian species. "I suspect that Phyllopora will eventually embrace 
several species of Palaeozoic corals, &c." (Op. cit., p 42.) With 
this knowledge in hand, Mr. Shrubsole, when re-examining the types 
as well as other Permian Polyzoa preserved in the Newcastle Museum, 
assented to King's judgment, by adopting Phyllopora both for the 
Permian as well as the Silurian species. (Quart. Journ. Geol. Soc, 
Aug. 1882, pp. 347-349.) Since then Mr. E. 0. Ulrich (14th Ann. 
Rep. Bryozoa of Minnesota, p. 63, 1886, in his remarks on a new 
species, Phyllopora ? corticosa— has offered the [suggestion that in 
all probability King's species may be allied to Polypora M'Coy and 
Lyropora Hall, and *' should that be the case, then it would be 
necessary to establish a new genus for the reception of the species " 
cited by him, such as Intricaria, Hall, and Retepori trentonensis, 
Nicholson, <S:c., which were suggestively placed by me among the 
Phylloporcie, (See notes on species of Phyllopora and Thamniscus 
from the lower Sil. rocks. Quart. Journ. Geol, Soc, May, 1885.) 
