•2(54 Proceedings of the Royal Physical Society. 



typical forms of restricted range (e.g. Monomerella, Pentamerus oblongus, 

 Megalomus, etc.), it must be understood that the above suggestions are 

 made under reservations necessitated by the limited nature of the collection. 

 On the other baud, it must be noted that in the chart of the distribution 

 of the G-uelph illustrating the " Palssogeography of North America,' 

 Prof. C Schuchert indicates the presence of that formation on the shores 

 of Prince Regent Inlet, though he does not discuss this point in the 

 body of his memoir. 1 



Limestone with Styliolina [Fig. 6]. 



A thick slab of earthy limestone shows a peculiar mode of formation, 

 being almost entirely made up of turreted Gasteropods. These are 

 indeterminable and give no clue to the age of the rock. Nevertheless, 

 considerable interest attaches to this limestone, as besides being striking 

 in its constitution, it contains numerous specimens of the small Pteropod 

 Styliolina. 



In the Devonian of the State of New York the minute Styliolina 

 fissurella (Hall) is diagnostic of the Styliolina or Genundewa Limestone, 

 and the genus does not seem to have been recorded from lower horizons 

 in the Paheozoic rocks of North America. 



The species considered here is much larger than Styliolina fissurella, 

 and yet not so large as Styliolina spica (Hall) 2 which it resembles closely 

 in shape. Several specimens attain a length of 6 mm., with a diameter 

 of about 0'75 mm. Although specific identity cannot be established 

 between this form and the known American species, tire presence of. an 

 abundantly represented Styliolina is in itself at first sight suggestive of 

 an horizon in the middle Devonian. On the other hand, Prince Eegent 

 Inlet lies so far from the classical New York district, that conditions 

 suitable to the development of Styliolina might ijuite well have taken 

 place there at a different epoch. Reckoning with this contingency, and 

 owing to the absence of record regarding the stratigraphic position of 

 this limestone relatively to that of the Upper Silurian fauna described 

 here, no more can be done than to draw attention to this interesting 

 occurrence, leaving to future expeditions the task of settling its position 

 in the sequence of the Palaeozoic rocks of Prince Regent I nl-t. 



| Bull. Geol. Soc. America, xx., L010. 



' Pal. New fork, Suppl, vol. vii., pi. 114, fig. 2s, 1888. 



{Issued separately, \5lh Men 1912.) 



