79 
The animal described and figured by Dr. J. Bigsby, 
to which we have already referred, seems rather 
different from our species. His specimens were 
found at Montmorenci, near Quebec, (Canada) more 
than an inch and a half in diameter. The following 
are his remarks on this trilobite.* “The front of 
the buckler is remarkably convex, and has on each 
side near the base, three very-small transverse lines, 
scarcely to be called depressions, corresponding to 
the sulci so strongly marked in the genus Calymene. 
There is frequently, but not universally, a very minute 
pisiform process on the centre of the front. The 
whole upper edge of the buckler is always surround- 
ed by a very ornamental semicircular border, some- 
times semi-elliptical, of punctures placed in the 
meshes of a net-work in high relief and arranged 
close together, in rays, passing perpendicularly from 
the buckler and forming at the same time when ob- 
served transversely, curved lines parallel to its upper 
rim or edge, excepting at the sides, where they di- 
verge, leaving a space occupied by other lines of dot- 
tings, parallel to the former, but speedily terminat- 
ing on the cheeks of the buckler. The lines which 
tantummodo sex, rhachide angusta. Pygidium breve, rotun- 
datum, leve; adeo parvum ut ne quidem capitis disco respondeat. 
Obs.—Oculos atque suturam facialem ex autopsia describere 
licet. } * | 
Vide Om. Paleaderna eller de sa kallade Trilobiterna af. 
J. W. Dalman, pages 50—4. 
* See Geology of the Island of Montreal, in igen of Nat. 
History, N. Y. p. 214. 
