54 Prof. T. R. Jones and Dr. H. B. Holl on 
An evergreen tree, 8-16 feet high, with a trunk 8 inches 
in diameter: leaves 13—4 inches long, 5-12 lines broad, on a 
etiole 14-2 lines long; peduncle 13-1? inch long, gradu- 
ally thickening to the summit; sepals 4 lines long, 3 lines 
broad, free and attached to the margin of the thickened apex 
of the peduncle, each with seven parallel nervures; petals 
9-11 lines long, 4-5 lines broad, including the inflected 
margins, with three apical teeth 1 line long, glabrous; co- 
lumnar disk 1 line high, 2 lines in diam., glabrous ; filaments 
3 lines, anthers 5 lines long ; scabridly rugulose ; ovary 3 lines 
long, 2 lines broad; style 4-7 lines long; capsule 8-10 limes 
in diameter; seeds at least 2 lines in diameter, attached to the 
central column*, 
VII. — Notes on the Paleozoic Bivalved Entomostraca. 
No. VIII. Some Lower-Silurian Species from the Chair of 
Kildare, Ireland. By Prof. T. Ruprerr Jones, F.G.S., 
and Dr. H. B. Hout, F.G.S. 
[Plate VIL] 
In 1863 Mr. W. H. Baily, F.G.S., Paleeontologist of the Geologi- 
cal Survey of Ireland, sent us, from the mountain near Kildare 
known as the Chair of Kildare, some of the grey, crystalline, 
encrinital limestone, of ‘‘ Caradoc-Bala” age, containing the 
minute fossils referred to by Prof. M‘Coy, in Sir R. Griffith’s 
‘Synopsis of the Silurian Fossils of Ireland,’ p. 58, as Cythere 
phaseolus of Hisinger. In 1865 Mr. Joseph Wright, F.G.S., 
of Cork, visiting the Chair of Kildare, brought away a quan- 
tity of this limestone to examine at his leisure; and having 
broken it up and picked out the separate fossils, he found 
many of these little Entomostraca, and sent us a liberal supply 
of them for examination. ‘These specimens are all smooth 
calcareous representatives of closed carapaces: they may be 
said to consist of the carapace-valves replaced by calcite and 
filled with the same; while a very thin film of pulverulent 
calcareous material sometimes represents the outermost portion 
(or surface) of the valves. 
It has been difficult to find alliances for these Lower-Silu- 
rian Entomostraca, simple as they are in form and structure ; 
but since our determination of the Silurian Primitie of the 
* A representation of this plant, with particulars of its floral structure, 
will be seen in plate 83 A of my ‘ Contributions,’ 
+ See the explanatory memoir entitled ‘Data and Descriptions to ac- 
company Quarter-Sheet 35 N,E. of the Map of the Geol, Survey of Ire- 
land,’ 1858, 7 
