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 1 

 the face of a clock or watch ; 

 the radii representing the 

 figures marking the hours. 

 AVithin 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 

 inflected disc, the rays appear to be rather stronger than else- 



Ann. ^ Mag. N. Hist. Ser.2. Vol.i. 22 



