62 (r. F. MATTHEW ON THE 



ovate-conical, with two pairs of short, slightly oblique furrows. Occipital furrow distinct, 

 crossing the axis. Occipital ring broad in the middle, bearing a tubercle to which a 

 spine is sometimes attached. Fixed cheeks tumid. Eyclobes prominent. Posterior fold 

 and furrow distinct. 



Movable cheek, rather narrow, attenuated backward into a spine of about its own 

 length ; the cheek has a strongly folded margin on the outside, but scarcely any behind. 

 The cheek is vaulted on a line extending from the eyelobe to the spine. 



The pleurœ are traversed by a strong furrow, extended toward the extremity. 



The pygidium found with this species is a third wider than long, with a high narrow 

 rachis and low side lobes, and a flattened border fold, furrowed within. The rachis is 

 divided into 5 (or 6) joints, and the side lobes are marked by two furrows on each side of 

 the rachis. 



Size — -Length of centre piece of the head (excluding the spine), 2| mm.; width, 

 4 mm. ; apical spine, i mm. Movable cheek, length, 4J mm. ; width, 1 mm. Pygidium, 

 length, li mm. ; width, 2 mm. 



Horizon and Locality. — Found with the preceding. 



Dr. W. Dames, in his studies of the Cambrian fauna of Liau-Tung, discovered a num- 

 ber of species which he referred to Anomocare, chiefly on the ground of the broad borders 

 and the narrow, many jointed pygidia. In this connection he discusses Angelin's descrip- 

 tion of the genus, and speaks of the difficulty of recognizing species of the genus owing 

 to the imperfect figures in Angelin's work,' and some errors in placing together the heads 

 and tails of difterent species. Through Linnarsson's and Brogger's corrections of these 

 errors, and by means of the well arranged material of the Royal Museum at Stockholm, 

 he was enabled to reach a certainty in naming the Chinese forms. In his remarks on the 

 various genera of the Chinese deposits he gave the range of this genus. Through the 

 studies of Nathorst andTullberg the layers of the Cambrian slates have become thoroughly 

 known, and it has been found that the chief extent of territory of the genera Anomocare 

 and Liostracus is in the Andrarum Limestone or the Zone of Paradoxides Forchamniexi. 



If we were to follow this ruling we would place the shales with Anomocare at the 

 top of the Paradoxides beds. But our species are not typical, and so strict a limit should 

 not be given. It is worthy of consideration, however, that the species of Agnostus which 

 accompanies these two species of Anomocare ranges in Europe through the lower Olenus 

 ])eds. We should, therefore, be inclined to place these Long Island trilobites at a lower 

 horizon than we did when originally describing them, i.e., in the Olenus beds proper. 



Obolus pulcher. Matt. 



' Can. Record Sci.,' Jan., 1889, p. 303. 



'Trans. Roy. Soc. Can., Vol. vii, Pt. iv, p. 151. PI. viii, figs. 1 a to m and 2 a to /. 



Note on the above species. — On a comparison of this species with the Obolus described 

 on a preceding page, it is clear that there are important difl'erences of structure. 



O. refulgens occurs at the geological horizon of O. Apollinis of Russia, the type of the 

 genus ; with this species it agrees in all respects as regards its generic characters, except 



' ' Palseontalogiea Scandinavica.' 



