138 
G. W. Lee — Trepostomata. 
proper the family Chaetetidae, placed in the Bryozoa Cyclostomata ; it is therefore of 
interest to note that in the latest edition of his “ Grundziige ” Nicholson’s classification is 
reverted to. 1 
It may be stated here that the greater part of Nicholson’s observations bore on 
materials of American source, mostly Silurian and Devonian. He recognised but two 
species of British Carboniferous Monticuliporids, viz., “ Monticulipora ” tumida (Phill.) 
and Stenopora howsei Nich. 
An able contemporary of Nicholson was J. Young of Glasgow. He took a keen 
interest in the Scottish Carboniferous Bryozoa and in a short note published in 1883 
proposed the new genus labulipora for the reception of the common Scottish 
M onticuliporid ? 
Of Vine’s contributions, there is little touching the British Carboniferous Monticuli¬ 
porids that can be of use to the student, his only addition to the fauna, Heterotrypa 
delicatula Vine, being too insufficiently characterised to be recognisable. 3 
Research on the Carboniferous Trepostomata of Britain ceased with the labours of 
Nicholson, Young, and Vine, and our knowledge of this group of British fossils is as it 
was left by these three investigators. Of the five species proposed at different times, 
Stenopora howsei Nich. is the only one that can be readily identified from the author’s 
description. The true nature of M’Coy’s Verticillopora dubia could not be ascertained 
without examination of the holotype, fortunately preserved. As for Cellepora urei Flem., 
Calamopora tumida Phill. and Heterotrypa delicatula Vine., these names must be 
discarded, the holotypes being lost and the descriptions totally inadequate. 
The largest share of the work done during the last thirty years on Palaeozoic Bryozoa 
belongs to American authors, and specially to Mr. E. 0. Ulrich. In 1882 4 he began the 
publication of a monograph describing the Palaeozoic Bryozoa of America. The 
Mouticu 1 iporidae are considered as Bryozoa and constitute his sub-order Trepostomata of 
the Bryozoa Gymnolaemata. The classification proposed in this important work atid in 
subsequent large monographs by the same author on the Palaeozoic Bryozoa of Illinois 
and Minnesota has gained general recognition in America, and is laid along lines 
in harmony with the requirements of modern palaeontology. 
The modern literature on the Trepostomata of other countries is not very voluminous, 
and mainly of a descriptive nature. One of the most widely known accounts is 
that by Waagen and Wentzel on the Monticuliporids of the Productus limestone 
of the Salt-Range. 5 In this work, published in 1887, they give accurate descriptions 
5 49. 
1 51a. 
2 50, p. 154. 
3 48, p. 386. 
4 41. 
