38 
VINE : CLASSIFICATION OF THE PALAEOZOIC POLYZOA. 
1881. Upper Helderberg GROUP.=Devonian. 
In this paper the "Bryozoaus of the Upper Helderberg and 
Hamilton formations " are described. Mr. Hall in a note says that 
he has " included a few forms of Ch.^itetes, which fi'om their 
structure can scarcely be separated from FAVOSiTiDiE, while the 
differences between this genus and Trematopora is hardly deter- 
minable by any well-marked characters. Under the Fenestellid^e, 
I have not recognized the genus Polypora, though describing species 
with from two to four ranges of cells on the branches. The numerous 
examples of this variation have rendered the distinctions between 
the genera obsolete." 
Genus Chsetetes, Fischer Four species. 
Trematopora, Hall Six 
„ Callopora, Hall Three „ 
„ Lichenalia, Hall Nineteen 
„ Sub-genus Phractopora, One species. 
Thallostigma, n.g. Three species. 
„ Stictopora, Hall Nine „ 
„ Intrapora, n.g. One 
Thamnopora, n.g. One 
Prismopora, n.g. Two „ 
„ Scalaripora, n.g. Two 
„ Glauconome, Goldfuss. Three 
„ Thamniscus, King Two 
„ Cystopora, n.g. One 
Clonopora, n.g. Two „ 
„ Crisina, D'Orbigny One „ 
Genus Fenestella (Miller), Lonsdale, Sixty-three species. 
Including Fourteen bracheted (Hemitrypa). 
In addition to the above lists I have by my side a carefully 
compiled MS. Catalogue of Palaeozoic Bryozoa, by my friend J. M 
Nickles, in which he enumerates, including Hall's species up to 
1887, the names, together with a few synonyms, of nearly 1,500 
species, American and Foreign. It is very certain that this amazing 
wealth demands the closest scrutiny, and to deal with all the mimitice 
which links together gToup with group, is beyond my powers. To 
