THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[SECOND SERIES.] 
No. 5. MAY 1848. 
XXXII. — On a new British species 0 / Campylodiscus. 
By W. C. Williamson. 
Whilst examining some sand dredged up by George Barlee^ 
Esq. from a depth of sixty fathoms, off the coast of Skye, I was 
fortunate enough to meet with a remarkably fine species of 
Campylodiscus, which does not appear to have been hitherto 
described. 
It presents a nearly orbicular disc, which, though slightly 
saddle-shaped, is considerably less curved than the Bohemian 
C. clypeus, and still less so than the C. zonalis of Mr. J. Phillips. 
The centre of the disc is perfectly smooth ; but around this is a 
circle of short, elegant projecting radii, which extend nearly to 
the periphery, and give to the 
whole the general aspect of 
the face of a clock or watch ; 
the radii representing the 
figures marking the hours. 
Within this ring, and closely 
bordering the inner extremi- 
ties of the rays, is a circle of 
very minute and slightly elon- 
gated tubercles, like those 
which surround the central 
siliceous umbo of the Arach- 
noidiscus Japonicus, but much 
smaller. There are usually 
four or five of these to each interspace separating the rays. A 
similar circle, but with the tubercles rather more conspicuous and 
elongated, connects the outer extremities of the rays with the ex- 
treme margin of the disc. On the two elevated portions of the 
infiected disc, the rays appear to be rather stronger than else- 
Ann. ^ Mag. N. Hist. Ser. 2. Vol. i. 22 
