20 



JOHAN KIÆR. M.-N. Kl. 



Helcionella rugosa Hail, var. acuticosta Walcott. 

 (PI. II, figs. 4, 4 a.) 



Description: The margin of the shell is very ovate and narrow; 

 but the specimen has evidently been compressed and its original outline 

 cannot be determined. The shell is very high, with a very prominent 

 and bowed apex, the latter thereby lying almost over the anterior margin 

 <fig. 4). Thus when seen in profile the dorsal region forms a marked 

 arc in the direction of the posterior margin, and the anterior side is bent 

 strongly concave. The sculpture consists of sharp, fine cross ribs, which 

 are very close below, and become more and more steep upwards. The 

 spaces between them are almost flat, and provided with very fine but sharp 

 radiating ribs or stripes. The interior mould of the shell, which is shown 

 in fig. 4, exhibits faintly raised and broad cross furrows; the latter appear 

 to be most marked in the central part of the shell. The length of the 

 shell is 4.6 mm., height 3.4 mm. 



' Occurrence: One excellently preserved specimen (Cat. 15, III) in 

 a loose piece of weathered sand}- limestone from Tomten. In the same 

 piece were found Scetiella depressa nov. sp., Hohnia Kjcrulfi Lnrs and 

 Obolella rotundata nov. sp. One little fragment also from the Holmia 

 shales (Cat. 13, XXVII, No. 453 a). 



Observations: This particularly beautiful little form agrees in 

 every respect with Walcott's variety acuticosta from the Lower Cam- 

 brian in North America. The sculpture is very characteristic. 



Pteropoda. 



Fam. Torellellida,e Holm. 



Torellella, Holm. 



Torellella laevigata Lnrs., var. Holmi nov. var. 



(PI. Ill, figs. 1 — 5.) 



ia7i. 



Hyolithus. laevigatus Lnrs., Eophytonsandstenen, page 9, pi. i, fig. i. 

 The first description of this form. 

 1893. Torellella laevigata Lnrs. G. Holm, Sveriges Cambr.-Sihiriska Hyolithidae &c. (Sveriges 

 Geol. Unders. Ser. C. Vol. 112, page 147, pi. i, fig. i — 12, pi. 5. fig. 95'- 

 Fundamental description of genus and species. 



1897. Torellella laevigata Lnrs. G. Holm, Om forekomsten af Torellella laevigata Lnrs. i 

 Olenellus-sk\Sern vid Tomten, Ringsakers socken i Norge (Geol. Foren. Förh. Vol. jg). 

 Mentions the first proof of the existence of Tor. laevigata at Tømten. 



