28 Dr. H. Woodward—A new Cyclus from the Coal-measures. 
YV.—NotE on a NEW British species oF CYcLus FROM THE COAL- 
MEASURES OF Bacup, LANCASHIRE. 
By Henry Woopwarp, LL.D., F.R.S., F.G.S. 
OME years since, Mr. Mark Stirrup, F.G.8., of High Thorn, 
Bowdon, Cheshire, placed in my hands a new form of Cyclus 
for examination. J had a drawing of it prepared, and made 
a note of it for future reference, but proceeded no further. That 
specimen is now in the Museum of the Owens College, Manchester, 
and by the kindness of Mr. W. E. Hoyle, the Keeper of the 
Collections, I am permitted to describe it in the GroLocicaL MaGazine, 
The specimen was obtained by Mr. George Scott, from the 
“Gannister seam” of the Lower Coal-measures, Old Clough Colliery, 
Bacup, Lancashire, and shows the dorsal aspect of a small circular 
Crustacean (?) shield, about the size of a shilling, a figure of which 
is subjoined. (The ventral aspect adheres firmly to the matrix, and 
cannot be described.) 
Cyclus Scotti, H. Woodw., sp. nov., Lower Coal-measures, Bacup, Lancashire. 
A. Dorsal aspect of carapace (nat. size). 
B. A portion of the left posterior border magnified to show ornamentation. 
Specific description.—Shield, or carapace, nearly circular in outline, 
bilaterally symmetrical (25 millimetres broad by 20 mm. long), 
having a well-marked median ridge dividing the carapace in half 
for 8 mm. from the posterior border; posterior margin slightly 
indented or notched in the centre; the lateral and posterior margins 
of the shield encircled by a smooth raised rim, which stops short at 
the antero-lateral margin (which is slightly compressed where the 
rim terminates), the shield being truncated for a breadth of 12 mm. 
in front. There is evidence on the right side of a slight extension 
of the smooth margin of the shield extending beyond the outer 
raised rim. Anteriorly the shield is ornamented by four, nearly 
equal, oval, prominences, each being about 5 mm. long, placed two 
on either side of the central line,’ with their longer axis directed 
towards the front of the shield; a well-marked, smooth, semi- 
circular ridge occupies the centre of each lateral area, and unites 
with the raised median ridge near the posterior border of the shield. 
The area enclosed between the outer and median ridges becomes 
considerably narrower as these approach the centre, near the 
posterior region of the carapace. The median ridge ends in front 
close to the outer pair of oval prominences; two other rather 
1 The two inner oval prominences have been largely cut away at some time 
in an injudicious attempt to develop the anterior part of the carapace. 
i 
