26 JOHAN KIÆR. M.-N. Ki. 



Hyolithus sp. No. 2. 

 (PI. III, fig. 6.) 



Description: Only one imperfect impression was found. The 

 greater part of the apex is lacking. The length of the fragment is 

 10 mm., the breadth at the aperture 65 mm., and at the broken end 

 (about 9 mm. from the aperture) 3.3 mm. The angle of divergence is 

 about 23^. The sculpture consists of somewhat irregular folds that cross 

 the shell in a faint arc. 



Occurrence: One specimen, fragmentary, from the Holniia shales 

 at Tomten. 



Remarks: See under Hyolithus sp. No. 3. 



Hyolithus sp. No. 3. 

 (PI. Ill, fig. 8 and 11.) 



Description: We have two impressions of greatly compressed 

 specimens. Length of one (fig. 8, Cat. No. 13, XXVII, 1000) is 14 mm., breadth 

 at the aperture 5 mm., and at the broken apex 1.2 mm. The length of the 

 other and more complete specimen (fig. 1 1, Cat. No. 13, XXVII, 698) is 20 mm. 

 Both are somewhat bent; the angle of divergence at the broader part is 

 about 20 0, at the narrow part 8 — 10 "^. The shell appears to have been 

 smooth. 



Occurrence: Hohnia shales at Tomten. 



Observations on Hyolithus sp. No. 2 — 3: The angle of diver- 

 gence is about the same in both forms. Ihey do not appear, however, 

 to belong to the same species, one form (No. 2) having a somewhat 

 coarse sculpture, whilst the other (No. 3) appears to be smooth. It is 

 possible that we are dealing with the same form or forms that were de- 

 scribed by LiNNARSsoN from the Hohnia zone at Forsemölla in Skåne as 

 Hyolithus sp. ^ The form and the angle of divergence agree somewhat 

 throughout. The incompleteness and poor state of preservation of the 

 material, however, do not permit any certain identification. 



' LiNNARSSON, De undre Paradoxides-lagren vid Andrarum (Sver. Geol. Unders. Ser. C. 

 No. 54, 1883, page 34, plate IV, figs. 21 — 23). 

 G. Holm, Sveriges kambro-silur. Hyolithidae, page 109. 



