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



Solenopora gotlandica 1 differs distinctly by its much thinner cells, 

 according to ROTHPLETZ only 0.025 - 0.030 mm. thick. The specimen appro- 

 aches nearer to Solenopora compacta BILL, from the Ordovician (Tren- 

 ton) of North America and Europe but this form also shows usually 

 narrower cells. A. BROWN in his article "On the Structure and Affinities 

 of Solenopora, together with Descriptions of New Species" 2 says the dia- 

 meter of the cells of this form is about Yi? mm - while ROTHPLETZ 1. c. 

 p. 12 writes 0.070 0.130 mm. If the latter dimensions of the cells are 

 correct it will be difficult to distinguish the Ellesmere Land specimen from 

 Solenopora compacta*. It would require very good material in which all 

 minute details could be studied. 



I have seen some sections of an hitherto un-described Solenopora 

 from the Silurian of the Island of Oesel in the Baltic Sea, made from 

 material collected by Professor KLER, and they show a very marked 

 resemblance to those made of the Arctic specimen. It is possible that 

 the cells of the first mentioned form are slightly narrower, generally 

 about Yi4 mm - in diameter. 



Occurrence: B, lower part, Seal Bay. 



Coelenterata. 



Anthozoa. 

 Tetracoralla. 



In a light coloured massive dolomitic rock, differing from all others 

 seen in the material from series B, some pieces of very badly preserved 

 aggregate corals that cannot be identified even as to genus occur. The 

 corallites which are subparallel, or in some cases more irregularly diver- 

 gent, show a circular or subcircular section with a diameter of from 2 

 to 4 mm. In some of the pieces we see numerous septa reaching the 

 center, in others they cannot be seen at all, but we find instead horizontal 

 or curved tabulae. I presume, however, that the different specimens belong 

 to one species, having both septa and diaphragms. The genus that 

 comes nearest into consideration is probably Diplophyllum HALL, although 

 nothing can be seen of the peripheral wrinkled epitheca characteristic 

 of this and other related genera. 



Occurrence: B, lower part, Reindeer Valley. 



1 Uber Algen und Hydrozoen im Silur von Gotland and Oesel. Kgl. Sv. Vet.-Ak. 

 Handl. Vol. 43, No. 5. Stockholm 1908. 



2 Geological Magazine. Dec. IV, Vol. I, 1894. 



3 After this was written a paper by ROTHPLETZ "Uber die Kalkalgen, Spongiostro- 

 men und einige andere Fossilien aus dem ObersilurGottlands" (Sver. Geol. Unders., 

 Ser. Ca. No. 10, 1913) has appeared where this form is cited also from the Silurian. 



