1916. No. 10. THE LOWER CAMBRIAN HGLMIA FAUNA. 25 



Hyolithus Eichwald. 



Hyolithus corragatus nov. sp. 



(PI. III. figs. 9— 9 a.» 



Description: One impression of a plastically preserved specimen 

 (Cat- No. 13. NXVII 197). Length of the remaining portion ii mm,, breadth 

 at the broad and imperfectly preserved end 2.5 mm., at the narrow end 

 0.75 mm. The angle of divergence at the broad end is 15 — 16^', and di- 

 minishes to about 10° towards the apex. The cross section appears to 

 have been round, without marked compression. 



The sculpture is very characteristic and consists of fine, undulating, 

 very irregular folds that run across the shell. 



Occurrence: One somewhat imperfect specimen from the Holmia 

 shale at Temten. 



Observations: This form has a very characteristic sculpture and 

 cannot be compared with any other known form. Its section indicates 

 that it belongs to the sub-genus Orthofheca. 



Hyolithus sp. No. i. 

 (PI. Ill, fig. 7.» 



Description: The form is quite small, length 5.2 mm., but originally 

 about 6 ram., the extreme apex being lacking. Breadth at the opening 

 2.3 mm. Angle of divergence about 20'^'. The apex appears to be some- 

 what slightly bent to the right, a feature which does not appear distincdy 

 in the figure. The shell is compressed, but has evidently been fiat on 

 one side and vaulted on the other. The broad end appears to have been 

 cut straight away. The sculpture cannot be seen. 



Occurrence: One specimen (Cat. No. 13, XXX'II, 8201 from Holmia 

 shales at Tomten. 



Observations: This little form reminds one strongly of Hyolithus 

 con/usus Holm 1 from the Lower Cambrian sandstone on Öland, but the 

 angle of divergence of the latter is greater 130°». It may possibly be 

 identical with Hyolithus sp. No. 2-. which is "not unlike confusus. but o{ 

 more elongated fornr'. 



The last-named form was found by Moberg in the Lower Cambrian 

 sandstone on Öland. 



1 Holm, Hyolithidae. page 74. 

 - Holm, ibidem, page 108. 



