16 



G. HOLM AND A. H. WESTEEGAAED 



Agnostus sp. No. 5 



[PI. I, fig. 46, 47] 



The fragments figured seem to show the pygidium of an undetermined Agnostus. 



The aspect given to the small shields in fig. 48 and 49 of pi. I when they were drawn 

 indicates that Holm may have considered them to be cephala of some species of Agnostidae 

 (or Eodiscidae Raymond ?). I should prefer to look on the former as possibly a poorly 

 preserved pygidium of A. repandus. The latter (fig. 49) resembles certain species of Gonio- 

 discus Raymond (e. g. G. pa/rkeri Walcott), but no specimen belonging with certainty to 

 Eodiscidae has been met with in the material, and, moreover, Eodiscidae of the type in 

 question are known only from deposits older than those under consideration.^ It seems 

 likely that also this small shield may be the pygidium of an immature specimen of an 

 Agnostus. 



Genus Centropleura Angelin 

 Centroplem-a loveni (Angelin) 



[PL III, fig. 13—16; pi. IV, fig. '24—25] 



1851 Paradoxides loveni, Angelin, Palaeont. Suecica, p. 2, pi. 3, fig. 1 — 3. 



1854 Ceniropleura loveni, ANGELrN, Palaeont. Scandinav., p. 87. 



1878 Centropleura loveni, AsoEhm, Palaeont. Scandinav. (Appendix), p. 95, pi. 3 (emend.), fig. 1, la, 4a, 4b. 



1902 Centropleura loveni, Gronwall, Bornholms Paradoxideslag, p. 124. 



Four fragmentary cranidia of young individuals may be identified with this species. 

 So far as they are preserved they agree completely with the Scandinavian form. 



The specimen in fig. 16 probably belongs here too. Apparently it difl'ers from G. loveni 

 in the course of the anterior two pairs of glabellar furrows, which appear to meet across 

 the glabella; this however does not seem to be an actual characteristic, but is due to pres- 

 sure on the test when embedded. The frontal lobe of the glabella of this specimen does not 

 show the oblique furrows owing to imperfect preservation. 



Gentroplewra loveni is common in the Paradoxides forclihammeri zone of Scania and 

 Bornholm. 



Genus Anomoearo Angelin 

 Anomocare excavatum (Angelin) 



[PI. II, fig. 1—14; pi. lY, fig. 19—21] 



1851 Proetus? ecccavatus, Angelin, Palaeont. Suecica, p. 22, pi. 18, fig. 3. 



1854 Anomocare excavatum, Angelin. Palaeont. Scandinav., p. 25, pi. 18, fig. ?•. 



1878 Anomocare excavatum, Bbogger, Paradoxidesskifreue ved Krekling, p. 39, pi. 3, fig. 14, 14a. 



1902 Anomocare excavatum, Gkonwall, Bornholms Paradoxideslag, p. 140, pi. 4, fig. 6. 



1906 Anomocare excavatum, Wiman, Bull. Geol. Inst. Upsala, vol. 7, p. 295, pi. 29, fig. 23. 



The Siberian form seems to be identical with the Scandinavian one. Even as regards 

 small details the uniformity is complete. Thus, for instance, a very small median tubercle 

 on the glabella just in front of the occipital ring, visible only in well preserved Scandina- 

 vian specimens, is "also ^een in some of the Siberian ones. 



1 The latest Scandinavian species of Eodiscidae 

 appear at the verj top of the Middle Cambrian (zone of 



Af/nostus laevigatus) 

 Pagetia Walcott. 



It seems to belong to the genus 



