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J. E. Hede 



which is only visible on the inner side of the shell. The margin is plain upon 

 the whole ; a small concavation being, however, visible in the middle of its lower 

 part, and traces of a ridge in the middle of the upper one. From the corners of 

 the lower margin, a broad sinus stretches towards a concavation situated on the 

 symmetry-line, quite near the upper part of the margin, and a little above the apex 

 of the shell. The sector thus enclosed is convex, but itself again divided through 

 a sinus proceeding from the apex and widening downwards. From the concavation 

 above the apex, the shell is rapidly elevated towards the margin, making a distinct 

 ridge which is, perhaps, more conpicuous since it is bordered by a very shallow 

 sinus on each side. Only on the peripheric parts of the exterior surface, a fine, 

 sharp striation parallel with the margin is observed. The interior surface is quite 

 smooth. 



Locality b. 



The species here described presents great similarity to Cryptocaris pulchra 

 Barr, but is, however, as I think, to be distinguished from this. 



Conclusions drawn from the fauna. 



Especially remarkable among the characteristics of this fauna is the great number 

 of species common with the Silurian of Bohemia, and further the richness of lamelli- 

 branchiates, which, numbering 11 determinable species (among 16 in all), makes an 

 essential part of this fauna. 



For estimating the age of these isolated layers, the stratigraphical data give us 

 little or no guidance, especially because no analogous formation is known from 

 any other locality of Skåne, where the stratigraphical conditions are more instructive. 

 Of course, it is rather exclusively in examination of the faunas we must try to find 

 hold for the comparison of the strata on the localities a and b, and even for an 

 eventual fixation of their very place in the silurian system. As has been told before, 

 only 3 fossils are common to both localities. These fossils are Cardiola interrupta 

 Sow., Cardiola migrans Bårr. and Orthoceras originale Barr. As all these are of 

 somewhat greater vertical extent, they afford only little information as to the age of 

 the layers. Excepting the above mentioned fossils, only 7 fully determinable spe- 

 cies are found at loc b. Of the two species there observed and formerly known, 

 only Monograptus Flemingi Salt, has value for the fixation of the geological age of 

 the layers. According to all other evidences, this species is characteristic for the 

 upper part of the Cyrtograptus shale. 



At loc. a, besides the 3 common species, 27 exactly determinable species have 

 been met with ; of these 14 are new and of course of no importance to the pre- 

 sent question. Of the 13 remaining species, 7 are known from Bohemia, and for 

 some of them we also have to note Portugal or France as habitats. None of these 



