

THE OTTAWA NATURALIST 



>. 



VOL. XXIX. AUGUST-SEPTEMBER, 1915 Nos. 5 and 6 



REVISION OF THE CANADIAN SPECIES OF 

 "AGELACRINITES." 



By Percy E. Raymond* 



There are two famous regions for these pretty medallion- 

 like little fossils, one in the Trenton formations of Ontario, and 

 the second in the younger Cincinnatian and Richmond strata 

 of southern Ohio and Indiana. The localities in Ontario have 

 produced by far the more perfect specimens, but those found in 

 the higher strata of the "Cincinnati dome" are generally 

 larger. The specimens found in the latter region are almost 

 always attached to a shell of some sort, most often abrachiopod, 

 generally a Rafinesquina. In Ontario it is very unusual to find 

 a specimen attached to any foreign object, though such specimens 

 do occur. 



It has been the custom to refer all the Canadian specimens 

 to two species, Agelacrinites hillingsi Chapman and A. dicksoni 

 Billings, while a third name, Agelacrinites chapmani, has been 

 current, and ascribed to Billings, though I cannot find that 

 such a species was ever described. In the present paper 

 several new species are described. More adequate illustrations 

 will be given in a paper soon to be published in the Bulletin of 

 the Victoria Memorial Museum. 



Genus Lebetodiscus Bather. 



Lebetodiscus, Bather, Geol. Mag. dec. 5, 5, 1908, p. 550. 

 Type, Agelacrinites dicksoni Billings. 



Dr. Foerste in his recent "Notes on Agelacrinidae "f 

 remarks that a new name is required for the Ordovician species 

 usually referred to Agelacrinites or Lepidodiscus. It seems, 

 however, that a name proposed by Dr. Bather in the third of 

 his Studies in Edrioasteroidea, entitled "Lebetodiscus, N.G. for 

 Agelacrinites Dicksoni, Billings," may possibly supply the want. 



Bather proposed the name after studying the incomplete 

 specimen of Agelacrinites dicksoni collected by Bigsby and 

 figured by Billings as figs. 4 and 4a of plate 8 of the third of the 

 "Decades." 



♦Published by permission of the Director of the Geological Survey of 



Canada. 

 tBull, Denison Univ. 17, p. 400, 1914. 



