C. Schuchert — Notes on Arctic Paleozoic Fossils. 473 



1. Ordovician. Gray to white, dense, magnesian limestone 



with a scarcity of organisms. 



Rafinesquina alternata (Emmons). Small specimens up to 



one inch across. 

 Rafinesquina alternata loxorhytis (Meek) ?. Much smaller 



than the typical specimens. 

 Peptama nitens (Billings). Common. 

 Zygospira, n. sp. Reminds of Z. cincinnatiensis, but is 



more coarsely plicated. 

 Rhynchotrema, sp. undet. Recalls small R. perlamellosum 



but no lamellae show. 

 Leper ditia sp. A large form 9 mm in width. 

 Encrinurus sp. 



This formation is clearly the Richmond, and of about the 

 same zone as the ostracod limestone of southeastern Baffin 

 Island. 



2. Silurian. In a crystalline, slightly granular limestone. 



"Streptelasma robustum Whiteaves." Grows to a diameter 

 of 2 "5 and a length of upward of 7 inches. A transverse 

 section is not round but oval, with the septa much twisted 

 in the center into a false columella. No fossula is to be 

 seen. In some ways these specimens look like Streptelasma 

 and in others like Zaphrentis. If they are associated with 

 the undoubted Silurian corals listed below, they are not 

 Whiteaves' species, bat as the Richmond formation is also 

 present on Southampton Island it is possible that they are 

 from the Ordovician and then related to S. robustum. 

 Lambe has labelled them S. robustum, a form common in 

 the Richmond formation of Lake Winnipeg, Manitoba. 



" Pycno stylus elegans." As the specimens are molds of the 

 exterior this identification is not yet established. 



Syringopora verticillata Goldfuss. The corallites are here 

 larger than is usual for this species. 



JPlasmopora follis Edwards and Haime. 



Haly sites catenularia (Linn6). As usual there is also here 

 considerable variation in the size of the corallites. 



Favosites gothlandicus Lamarck. Very common in the 

 typical form with small corallites. 



Favosites gothlandicus variety. Also very common. Here 

 the corallites are nearly twice as large as in the typical 

 forms of tbis species. As there are no transition specimens 

 between this and the typical forms of the species, it may 

 be a distinct species. 



Favosites favosus (Goldfuss). Rare. Here the corallites do 

 not attain the larger sizes of this species seen elsewhere. 



Clathrodictyon vesiculosum (Nicholson and Murie). This 

 characteristic hydroid is present in three specimens. 



" Pentamerus oblongus Sowerby ?." A fragment of a dorsal 

 valve too poor to identify. 



