16 OLAF HOLTEDAHL. fsEC. ARCT. EXP. FRAM 



always witli a slightly irregular curvalure. The diameter of tlie corall- 

 ites is 1,5 !2,"> mm., the distance between the cells about the same. In 

 longitudinal sections, numerous closely arranged funnel-shaped diaphragms 

 are visible in the interior. The detailed characters of the surface as to 

 annulations etc. not known. 



Occurrence: B, lower part. Seal Bay. 



Hydrozoa. 



Stromatoporoidea. 



Stromatopora GOLDF. 



Stromatopora sp. 



A portion of a colony, not large, of a Stromatopora was found, but 

 unfortunately the preservation is so poor that scarcely any structure can 

 be seen in microscopic section, and we will therefore refrain from any 

 closer consideration. Macroscopically the numerous undulating laminae 

 can well be seen. 



Occurrence: B, lower part, Seal Bay. 



Graptoloidea,. 



Axonophora. 



Monograptus GEKV. 



Monograplns sp. 



In pieces of dark argillaceous limestone from two localities repre- 

 senting -- according to SCHEI'S preliminary report- - the upper part of 

 series B, occur several badly preserved specimens of a Monograptus. 

 No specific determination can be made. The rhabdosomes are straight with 

 a width from the smooth margin to the end of the theca amounting to 

 1'j 1-':; mm. The theca generally seem to be nearly straight, but 

 -MUM- of Ihr belter preserved ones indicate a very slight curvature near 

 the aperture. In some polyparies an axis can be observed along the 

 smooth margin. 



A> far as can be seen, the form seems to approach a species like 

 the Kiiropean Moitof/nipfiis ( Pristiograptusj colomts BARH. and allied 

 form-. With its fairly straight theca il is distinctly different from Ihe 

 ,17. i>rio<l<i grniip which is the only one of large Mon oyrapti known from 

 North America, represented by the lw<> species, M. dintonensis HALL and 

 the very closely related M. cl/<tpnt(t)H'HKix I\UEDEMANN from the Clinton. 



