VINE : BRITISH PALEOZOIC CTEN0ST0MAT0US POLYZOA. 83 
like these would have been sorely tried if he was not allowed to place 
his treasures in the family Valkeriidse at least. In Valkeria tuberosa, 
fig. 2, pi. IV., whorls of cells are similarly placed at intervals on a 
delicate hollow stolon, the walls and the central portions of which 
are like the stolons of A. situriense, and the only difference between 
the two, so far as structure is concerned, is the Zoaria of recent 
Valkeria are free, whilst the Zoaria of Ascodictyae are repent. 
PALiEOzoic Ctenostomatous Polyzoa 
Genus Vinella, Ulrich. 
1. Vinella repens, Ulrich, Upper Silurians, Shropshire. 
2. „ „ var. contorta, Vine, „ ,, ,, 
Genus Ascodictyon, Nicholson and Etheridge, jun. 
3. Ascodictyon filiforme, Vine, Upper Silurian, Shropshire. 
4. ,, radiciforme, Vine. ,, „ „ 
5. siluriense, Vine „ „ „ 
Middle Devonian, Ontario. 
?6. ,, fusiforme, Nich. & Eth. jun., and Garb. Shales 
Scotland. 
7. ,, stellatum, Nich. & Eth. jun. 
Carboniferous. 
?8. „ radians, Nich. & Eth., Carb. Shales, Scotland. 
9. ,, Youngi, Vine, „ ,, Hairmyres. 
Genus Rhopalonaria, Ulrich. 
10. Rhopalonaria venosa, Ulrich, Low. Sil. Cincinnati Group. 
111. ,, botellus, Vine, Up. Sil. Shropshire. 
Description of Species. 
In the synopsis of classification which prefaces the description of 
Pala30zoic Bryozoa in the Report already referred to,* Mr. E. 0. 
Ulrich suggests the following arrangement. : — 
Order Gymnolemata, Allman. 
Sub-order Ctenostomata, Busk. 
Family Ascodictyonid^:, Ulrich. 
* Geol. Survey of Illinois, Vol. viii. Geology and Paleontology, 1890, p. 367. 
