70 



JOHAN KIÆR. M.-N. Kl. 



of growth, right from the Paraprotâspis stage, this form is one of the best 

 known and studied Mesonacidac. It is also found at Tomten in a piece 

 of weathered sandy limestone from the Holmia slialcs. 



It has also been found at several localities in the Mjes district, e.g. by 

 Th. Münster^ by the River Finna in Snertingdalen, to the west of Mjesen, 

 by the Braastad River by J. Brastad-, and in a loose piece of dark lime- 

 stone shale to the south of Helgeberget by \'. M. Goldschmidt". 



Outside the Mjes district it has been found in Norway at Kletten in 

 the ordinary Holmia shales by W. C. Brogger^ in limestone boulders in 

 dark shale at Aasta near the River Glommen by Schjøtz"^ and Bjorlykke''. 



Holmia grandis, nov. sp 



(PI. VI, fig. 12). 



Description. Only a portion of the cranidium is known. Avery 

 large form. In form the Glabella approaches very close to Holmia Kjerulfi 

 Lnrs., but is of more even breadth than in large specimens of the same. 

 The frontal lobe have a similar form, but continues posteriorly at the sides 

 in a broad flap to the eye; this flap is distinctly bifurcated by a medial 

 furrow. The posterior portion continues as usual in the palpebral lobe; 

 the anterior portion stops at the eys which is considerably shorter than in 

 the case oï Holmia Kjenilfi. The second lobe is less markedly genicu- 

 lated more evenly bent, and more pointed. The 3rd and 4th lobes resemble 

 those in Holmia Kjerulfi. The occipital segment is unknown. The 

 outer cheeks are very broad; the posterior margin and the inter- 

 genal spines appear to have a similar form to those of the geno-type. 



Dimensions. Half the breadth of the cranidium is 40 mm. It has 

 thus been about 80 mm. broad and presumably 42—43 mm. long. 



Occurrence. Only one fragmentary cranidium \n \.\\e Holmia shales 

 at Tomten (A. K. 114). 



Observations. In the above description we have given the points 

 by which this form differs from Holmia Kjenilfi. The chief characters are 

 the small eyes whereby the posterior flaps of the frontal lobes are bifur- 

 cated and much more markedlv elongated than in the case of the geno-type, 



1 Karlbladet Lillehammer, Tekst (Norg. Geol. Unders. No. 30, 1900, pag. 22I. 



2 J. Br.xst.^d, Disdnelli HolstM&wnaçn, etc. (N. G. Tidsskr. Bd. II, 1915, pag. 13). 



3 V.M.Goldschmidt, Profilet Ringsaker — Brøttum (N. G. U. aarb. 1908, pag. 34I. 



4 Fossiler fra Øxna og Kletten (Geol. Foren. Stockh. Förh. Bd. II, 1875, pag. 572». 



5 Den sydøstlige del av Sparagmitkvartsfjeldet (N. G. L'. No 35, 1902, pag. 18). 

 ö Det centrale Norges bergb3'gning (N. G. U. No. 39, 1905. pag 40). 



