1 91 6. No. lO. THE LOWER CAMBRIAX HOLMIA FALXA- 



however, are characters to which we should not attach special importance. 

 Of greater significance is the uniform development of the segments, a fea- 

 ture that is seen again in certain Callai'ia forms. 



I am inclined to believe that the Kjendfia type has developed from 

 Callavia forms; but it possesses such prominent peculiarities that it roust 

 be placed in a new genus by itself. I have named it after Th. Kjerulf 

 who was the first to depict a typical cranidium from Tomten. 



In addition to the form described here, we may also presumably add 

 that described by Moberg as Holniia Ltindgrem from Skaane. 1 have 

 already (p. 56) emphasized that this form cannot be referred to Holntia. 

 .\lthough the frontal lobe of the glabella is more rounded it agrees gene- 

 rally with Kjenilfia in the structure of the cranidium, with its broad genal 

 spines, its broad h\*postome attachments, and its rudimentary spine on the 

 occipital segment. The hypostome is narrower. The pleurae of the thoracic 

 segments and the pygidium appear to be built according to one and the 

 same type. The spines of the segments, however, differ slightly. However 

 the fragments found do not give a clear idea of the above and a number 

 of other structural features; we may therefore await more complete disco- 

 veries, before this form can with certaintj^ be included here. 



Kjeralßa lata nov. gen. Ä: sp. 

 «PI. IX— Xlli, XI Y, fig. 1—2.» 



1873. Paraeioxides Kjerulfi, Lnrs. p. p. Th Kjercxf, Sparagtnitfjeldet, page 83. figs, i and 

 4. Depicts cranidium and segments of thb form, with Holniia Kjenilfi Lxrs- 



1879. Paradoxides tOiaie/Jus} KJmtlß. Lnrs. p. p. W. C. Brogger. Om Paradoxidesskifeme 

 ved Kreitling <Xvt Mag. f. Xaturv. p. 44». Certain parts of the description refer to 

 this form, which Brogger regarded as large specimens of Holmia Kerulfi. 



1888. Olenellits Kjerulfi. Lnrs. p. p. G. Houi. Om OUnelltiS Kjernlfi (Geol. Foren. Fôrh. 

 Bd. IX. Tafel 15, fig. 17 -ao». Certain parts of the description refer to this form, 

 which Hout regarded as large and old specimens of Holntia Kjerulfi. Figs. 17 — 20 

 on pi. 15 represent the occipital spine and the scolptnre of the shell. 



Description. The state of preservation of this form is not so favour- 

 able as in the case of the far smaller Holniia Kjenilfi L.xrs. The speci- 

 mens are alwa\s greath' compressed, most often pressed obliquely, and 

 fragmentary. The amount of material however at our disposal is so large that 

 it is possible to give a satisfactory picture of this form in all essential points. 



The form of the body is broad and comparatively short, ft-om which 

 feature the name laUi appears to be suitable. The size is very considerable. 



The Cranidium is almost semicircular in outline; the length, however, 

 is somewhat greater than half the breadth. (See section on dimensions 



