ART. 21 ORDOVICIAN TRILOBITES ULEICH 11 



and in believing that it belongs to this species. This cheek, judging 

 from Barrande's figure of it, is very much like the one found in this 

 country with T. hicornls. 



As I have no specimens of T. fractus and have nothing to add to 

 what has been published already the reader is referred to the works 

 above cited for details not shown in the reproductions of Barrande's 

 Illustrations on Plate 1. 



Occurrence. — Etage D 4, Lodewitz and Koenigshof , Bohemia. 



TELEPHUS GRANULATUS Angelin 



Plate 1, Figures l£^-23 ; Plate 2, Figure 13 



Telephus granulatus Angeojn, 1854, Pal. Scandin., p. 91, pi. 41, fig. 21. 

 Bohcmillaf denticulata Linnarsson, 1875, En egendomlig Trilobitfauna 



fr^n Jemtland, G. F. F. vol. 2, p. 291. (Free cheeks.) 

 Aeglina denticulata (cheek) and Telephus hicuspis (cranldia) Holm, 1897, 



Palaeont. notiser. No. 4, G. F. F. vol. 19, pp. 461 and 463. 

 Telephus granulatus Hadding, 1913, Slaktet Telephus Barr., Meddel. Lunds 



Geolog. Faltklubb, No. 18, p. 35, pi. 1, figs. 8-10 



Though relying mainly on Hadding's work in estimating the char- 

 acters of this species comparison of his figures of Swedish specimens 

 referred by him to the species with Angelin's figure of the Norwegian 

 specimen on which the latter founded the species gives no convincing 

 reason for doubt as to their specific identity. Still, and aside from 

 certain observed differences between Angelin's and Hadding's illus- 

 trations of the cranidium that can not be explained without direct 

 comparison of the originals, I note also — in comparing Hadding's 

 figures 8a and 9 — differences in the shape of the glabella and in the 

 outline of the free cheek that are not readily conceivable as due to 

 compression and which therefore suggest confusion of two closely 

 allied species or varieties rather than individual variation. The fact 

 that both of these cranidia possess a pair of glabellar horns is not 

 sufficient to prove the specific identiy of the animals to which they 

 belonged. Such hornlike spines occur also in the clearly distinct 

 American species, T. hicomis, the 40-plus cranidia of which afford 

 convincing evidence of the constancy in cranidial characters that pre- 

 vails in species of this genus. That the word " prevails " is not too 

 strong is indicated by similarly manifested constancy in all other 

 American species of which numerous specimens have been found. 



Occurrence. — Angelin's type of the species is said to have been 

 found in " D a ? " in Norway. The specimens referred to the species 

 by Hadding come from the upper part of the Ogygiocaris shale in 

 Jamtland, Sweden. 



