62 

 Spirifeba plicatella, L. 



Anomia pUcatella, Linnaeus. . . .1767. Systema Naturse, 12th ed., p. 1154. 



plicatella, Davidson. .1866. Brit. Silur. Brach., p. 84 (which see for a 

 complete list of synonyms of British and European 

 specimens up to that date) pi. 9, figs. 9-12. 



Durham, J. Townsend, 1874-82; one small specimen with both valves 

 preserved, two separate dorsal and two separate ventral valves. Elora, 

 J. Townsend, 1892: one small specimen with both valves preserved. All 

 the specimens that the writer has seen, so far, are either casts of the 

 interior of the shell or else have the outer layer of the test exfoliated and 

 hence do not show the fine radiating raised lines characteristic of the 

 species. The two dorsal valves from Durham have the mesial fold partly 

 divided by a faint longitudinal grove, and there are three low, rounded 

 plications on each side of the fold. The characters of the two ventral valves 

 from Durham are so similar to those of the Spiri/er bicostatus, the Orthis 

 biaostatus of Vanuxem, as described and figured by Professor Hall, that 

 it is just possible that these two valves should be referred to that species 

 rather than to S. plicatella. S. plicatella and its var. radiata had pre- 

 viously been recorded (in the Geology of Canada, 1863) as occurring in the 

 Clinton formation at Flamborough "West, near Dundas ; in the Niagara 

 limestone at Thorold, Flamborough West and Grimsby ; in rocks of about 

 thle same age at Port Daniel, in the Baie des Chaleurs ; and in division 4 

 of the Anticosti group at South-west Point and the Jumpers. 



Spirifera ceispa, Hisinger. 



Terebratula crispa, Hisinger (not of Linnseus) . . 1826. Vet. Akad. Handlingar, pi. 



7. fig. 4. 



Spirifer crispii.s, Yl&W 1852. Pal. N. York, vol. II., p. 



262, pi. 54, figs. 3, a-le. 



Spirifera crispa, Davidson 1866. Brit. Silur. Brach. , p. 97 



(which see for a full list of 

 synonyms, with references, of 

 British and European specimens) 

 3, u.-k. pi. 10, figs. 13-15. 



Durham, J. Townsend, 1882 : a single ventral valve. 



According to Professor Hall (op. cit., p. 263), S. crispa occurs in the 

 Niagara shales at Lockport, Lewiston and other localities in the state of 

 New York, but Dr. Davidson says that he does "not feel certaia" 



" whether the American fossil really belongs to Hisinger's species." 



In the " Geology of Canada " (1863) S. crispa is recorded as having been 

 found in the Niagara limestone at Thorold, Ontario, and (under the name 

 " S. crispata," an obvious inadvertence or typographical error) in rocks of 

 the same age, at Port Daniel. 



