178 BRITISH PALAOZOIC SPONGES. 
The figure given is a very imperfect representation of the original, which is 
said to be from Coniston. 
54, Bornroconis pLana, King. 
1850. Mon. Permian Foss., Pal. Soc., vol. iv, p. 18, pl. ii, fig. 6. 
The original specimens, now in the Museum of Queen’s College, Galway, con- 
sist of shallow, circular depressions on the weathered surfaces of shelly limestone. 
In some instances the pits are close together, whilst in others there are consider- 
able interspaces between them. Their origin is problematical; they may be due 
to mere weather-erosion since the limestone was exposed. They are certainly not 
Sponges. 
The types are from Magnesian Limestone (Permian), Tunstall Hill, Durham. 
55. CNemipium TENUE, Lonsdale. 
1839. Murchison’s Silurian System, p. 694, pl. xvi bis, figs. 11, 11 a, 110. 
The original specimen, shown on the weathered surface of a slab of Wenlock 
Limestone, now in the Museum of the Geological Society of London, appears to be 
either a small coral or a polyzoon. It is from Dudley. 
56. Coscinopora pLacenta ? Lonsdale (non Goldfuss). 
1840. Transactions Geological Soc., ser. 2, vol. y, pl. lviii, figs. 5 a—5 d. 
The original belongs to the Stromatoporoid group, and is the form known 
subsequently under the name of Caunopora placenta. It occurs in the Devonian 
Limestone of Plymouth and Torquay. 
57. Enropia Antiqua, Portlock. 
1843. Report on the Geology of Londonderry, &c., p. 360, pl. xxi, figs. 5a, 56. 
Judging from examples of this species now in the Museum of the Geological 
Survey, Jermyn Street, which correspond closely with Portlock’s descriptions and 
