2 



BRITISH FOSSILS. 



rings separates it, and that genus lias so broad and expanded a 

 margin, which is without a furrow, and the facial suture so far out- 

 wards, that there evidently is but little affinity with Angelina. 

 The genus is named in honour of the Swedish paleontologist, who 

 IS carefully illustrating the old rocks of Christiania. Two fasciculi 

 of his quarto work are already published, and we wait anxiously 

 for the remainder. His Calymene ? leiostraca, Pal. Suecica, t. xix. 

 fig. 3, may very possibly belong to this genus. 



Description. — Usually three or four inches long (one specimen 

 fully six inches), of a broad oval contour, the head blunt, and the tail 

 only moderately pointed. The head occupies less than one-third 

 of the length, and is semicircular, but rather tnmcated forwards ; a 

 narrow equal margin, not raised or thicker in front, runs all round, 

 scarcely broader than the occipital border of the cheek, and con- 

 tinuous with it ; an equal space separates this margin in front from 

 the glabella, which is parabolic, much longer than broad, and quite 

 destitute of any lobes. It is about equal in width to the cheeks 

 (exclusive of their margin). The cheeks themselves are gently 

 convex, smooth, and bear the small curved eye midway, but nearer 

 the glabella than the marginal furrow. The facial suture is nearly 

 vertical to them above, and then turns sharply outwards to cut the 

 posterior margin at its outer third. 



The labrum is seen on one or two specimens. It has a central 

 raised portion, separated by rather a deep groove from a flat margin, 

 which is broadly and abruptly truncate at the apex.* 



Thorax of 15 segments ; the axis narrower than the sides, gently 

 convex, and tapering quite regularly backwards. The pleurae are 

 nearly direct, slightly produced and bent back at their ends, and 

 grooved throughout. They are bent down a little from the angular 

 fulcrum, which is placed at rather more than one-third in front (our 

 figure shows it too far out at this point), and at much less than one 

 half in the middle segments. The hindermost segments are scarcely 

 at all produced or curved backwards ; and all the segments are 

 facetted for rolling. The pleural groove is deepest beneath the 

 fulcral point, and as beyond this the facet bounds it in front, and 

 the posterior edge of the segment is convex beyond the fulcrum, 

 the groove becomes an elongated rhomboidal depression : a feature 



* It is a little like that of Lichas, but is -without the terminal notch and the " auricles " 

 or lateral wings, and differs from that of Olenus by its broad margin. Conocoryphe has a 

 labrum without so broad a margin, and not nearly so truncate. 



