REMARKS ON CEPHALASPIDES. 
139 
are three good specimens in tlie Montrose Museum, one of which 
was discovered in a quarry near Brechin ; another is from the 
neighbourhood of Friockheim, I have also been able to secure three 
specimens in tolerable preservation. Two of these were found in a 
quarry at Legguston, near Friockheim. The only other specimen I 
know of, a very small one picked up by Mr. Walter McMcoll, in a 
singularly rich deposit discovered by him in the Sidlaw range, is now 
in the cabinet of Lord Kinnaird. As already stated the buckler- 
shaped heads are occasionally met with wherever the flagstones are 
wrought, in some places rather plentifully, as in a quarry on the Tur 
hill range, about a mile east from the Mansion House of Pitscandly, 
also in a Red Sandstone quarry near Brechin ; yet even there these 
are only to be had by getting the workmen to preserve them as they 
turn up. Indeed I may say that the only locality which has as yet 
yielded these organisms to individual research is mentioned as dis- 
covered in the Sidlaws by Mr. Walter McXicholl, one of the most 
energetic and consequently successful of our local explorers. On the 
same slab on which Mr. McNicholl found the small entire Cephalaspis 
noticed above, may be seen the heads of some four or five others, some 
of these heads showing the very lengthened and toothed cusps above 
described. 
Whether these lengthened and toothed cusps may mark a different 
species from that generally found (Gephalasjjis Lyellii) it is not my 
province to decide : my own impression however is that this rather 
points to difference in age or sex, most probably the latter. Should 
this be the case it is worthy of remark that only one species of 
Cephalaspis has yet been found in Forfarshire (in Scotland I ought 
lather to say), where the remains of these curious creatures have been 
found in comparative abundance and good preservation, while in the 
contemporaneous rocks of England, where, so far as I am aware, they 
are both rarer and much more fragmentaiy, there would seem to 
have been not only a considerable number of different species detected, 
but also the so nearly allied genus Aucliena^ijis. Could it be possible 
that the above causes, age or sex, should have occasioned this seeming 
variety of species— fracture and displacement of the parts when first 
laid down might also occasion very considerable apparent divergence. 
Beyond Forfarshire I only know of one locality that has been at 
all fruitful in these organisms, the well-known den of Balruddery, 
and this is just on the confines of the counties of Perth and Forfar. 
One or two heads have also been found in Canterland Den, in 
Kincardineshire, by the Rev. Hugh Mitchell, of Craig, A quarry in 
Sheriffmuir, not far from the Dunblane station of the Scottish Midland 
Railway, has yielded one imperfect head ; and two have been got at 
Langfine, near Muirkirk, in Ayrshire. In no case has an entire fish 
been found in any of these localities. 
In this short notice of the Forfarshire Cephalaspis I have purposely 
endeavoured, as fiir as I could, to avoid all scientific names and phrases, 
so that my description might be as intelligible as possible to all your 
readers. I ought also to remark that although the proportions and 
