OLAF HOLTEDAHL. [SEC. ARCT. EXP. FRAM 



studies, however, made it apparent that species from Elles- 

 mereland must he distinguished as a distinct species, because of its cons- 

 tantly smaller size and somewhat different form. I had an opportunity 

 of .studying the I., plioca not only in the descriptions and old figures 

 hut fortunately in specimens from a collection from one of the type 

 localities. Beechey Island. The collection was brought to the University 

 of Kri.sti.-Miia by the "Gjia"-Expedition of 19031905, Captain ROALD 

 AMUNDSEN. As a result of this comparison I found that there undoubt- 

 edly exists a difference in size and some also in form between these 



. 



specimens, and those from Ellesmereland. Out of more than one hundred 

 specimens I possess of the latter, only the very largest attain nearly 

 the size of small adult specimens of the former. It is evident also 

 from the illustrations of SALTER and HAUGHTON that L. plioca is a rela- 

 tively large form. In outlineL.se/zenisniuchmorerectangularthanthe 

 other form, that has a rather acute triangular outline in the posterior part. 



As to the phyllogenetic relation of the new genus, 1 believe that 

 Dr. TWENHOFEL will consider this question, especially as he has found 

 the oldest representative of the genus. So much may be said however, 

 that as the genus as far as we know appears at about the same time 

 as the true Atrt/pas, it cannot be derived from this genus. We have to 

 seek its origin down in the Ordovician and probably among the same 

 forms that have given rise to Atrypa, viz. Zygospira-\'\ke forms. 



Occurrence : B. lower part, Reindeer Valley, B, lower part, Seal Bay. 



Spiriferidae. 



Spirifer SOWKRBY. 



Spirifer modestus HALL var. striatissimns nov. var. 



PI. VIII. fig. 2. 



\\"e have <,ne complete and several fragmentary specimens. The 

 size and the ouler form are exactly like in Spirifer modestus HALL 

 which is one of the mo-t common brachiopods of the Keyser of Mary- 



\ .lli'ii/in /ilium Ki m:mi>.,r. I '.il.-runtology of Aivl i<- ( inasl <-lr. Oimrl. Jour- 



nal <M-ol. SlPC., vul. oi. |l. .V.il). 



I'.MII 1 .. Iliinli'lln filKii-n AMI. Citc.l in the list of lo-^ils IV. nn I! ..... -li.-y Maml. 

 A|.|M-mlix to tli,> "Cniisr ..f the Nr|itiinr" (\>\ A. 1'. Low - Ollawa 



I'.Mu. A/I//IXI /iliiini I, AMI. i. A|>|H'inlix lii "iJcporl on an Expedition to the Arctic 



M. .|,- (.n I'.c.anl Hi.- Arctic" ll.y .1. lv |'.I:HNH:II. Ottawa P.MO). |>. i-SI. 



I'.Hj. Alni/iii iil/in-K <;.\V. l.ii. Note on Arctic Palaeozoic Fossils from the "Hecla" 



an.) "Fury" ( lol lections. I'm.-. li,,y. I'liys. S,,c. K.liiilmr.yli. \'ol. IS, No. 1, |).^:.S. 



