Skånes Coloniisskiffer 



63 



are effaced before reaching the margin. On each segment there is an oblique groove 

 narrow just at the axis and there directed backward-outward, then broader and hol- 

 ding the middle of the segment, gradually, however, approaching the posterior margin. 

 Length 18 mm., breadth 29 mm. 



This pygidium resembles that of Dalmanites dubia Barr, but differs by its 

 flatness (resp. concavation) on the side-parties of the axis-rings, by the more rounded 

 outline, and by the more quickly narrowing side lobes. 



Acidaspis cardiolarum n. sp. 



Pl. IV, fig. 20 (and 21?) 



Pygidium (fig. 20) triangular, and, apart of the spines, three times as wide as 

 long. Axis (somewhat damaged) very convex, short, about one-third the width of 

 the pygidium, slowly narrowing and not reaching the posterior border. Axis as 

 well as side lobes with three segments. The middle segment of the side lobes 

 continuâtes over the border, ending in a long spine directed backward and a little 

 bent. Also the anterior segment has on each side a marginal spine, but this is 

 nearly rudimentary. The posterior one has 6 marginal spines relatively short, all 

 of equal strength and directed straight backwards. One specimen found. 



Locality a. 



Also a fragment of a thorax (fig. 21) belonging to an Acidaspis-species has 

 been found in the same layer as the pygidium above-described. 



The axis, very convex, is not fully one third the width of the segment. 

 The rings show a rather low wale running between the axial furrows and contin- 

 uing in the middle wale of the pleura. On each ring two small tubercles can be 

 seen. Such a one is also to be found near the outer end of the pleune, at the base 

 of the strong, gently recurved spine, in which the middle wale of the pleura is 

 running out. 



It seems very possible that this fragment belongs to Acidaspis cardiolarum. 

 But it is also possible that these thoracic segments represent another species, hitherto 

 unknown. On that account it is with some reservation that I here, for the 

 present, will bring it together with Acidaspis cardiolarum. 



Oryptocaris scanica n. sp. 



Pl. IV, fig. 27 and 28. 



The small chitinous shell is semicircular with rounded corners. That part of 

 the outline which corresponds to the base of the segment (in the following for the 

 sake of brevity called »the lower margin»), is, indeed, not straight but forms an 

 outwards convex line. The shell is very thin, excepting the thickened border, 



