16 OLAF HOLTEDAHL. [SEC. ARCT. EXP. FRAM 



always with a slightly irregular curvalure. Tlie diameter of the corall- 

 ites is 1,5 ^,5 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 GEIN. 



Monograptus 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 

 I 1 /.) l 2 /;j mm. The tbeca generally seem to be nearly straight, but 

 some of the better preserved ones indicate a very slight curvature near 

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

 smooth margin. 



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

 the European Monograptus (PristiograptusJ colonus BABR. and allied 

 forms. With its fairly straight theca it is distinctly different from the 

 M. priodon group which is the only one of large Monograpti known from 

 North America, represented by the two species, M. dintonensis HALL and 

 the very closely related M. chapmanensis RUEDEMANN from the Clinton. 



