3 1 Frederick Chapman : 



B. — Probably a nodal columnar joint ; Avith a rounded peri- 

 phery, but inclined to be subpentagonal in outline ; axial canal 

 pentagonal : area around perforation depressed on both facets, 

 and having five distinct grooves from axis to margin ; surface 

 smooth, tumid between the radial grooves. Diameter} 5.25 mm. ; 

 height, 2.6 mm. (Fig. 17 a, h.) 



Some ossicles (? arm-joints) are found forming the nuclei of 

 the (?) Girvanella pellets, but these also are obviously of an 

 indeterminate character. 



OhKervations. — In the Appendix to the chapter on the Crinoi- 

 dea m Eastman-Zitters Text-book of Palaeontology,^ it is stated 

 that ■' Crinoidal fragments have been detected in the Cambrian, 

 but consist of stem-joints only {Dendrocrinus).'' 



In their " Revision of the Crinoidea " Messrs. Wachsmuth and 

 Springer^ give, in the diagnosis of Dendrocrinus, " Column 

 pentagonal, or excei^tionally round." They record all the 

 species, except one from the Niagara Group, in the Lower Ordo- 

 vician (Trenton Limestone). The stem of Dendrocrinus cylin- 

 dricus, Billings, 3 is of the same general form as our fragmentary 

 specimens indicate, but further comparison is impossible, since 

 the indispensable portion, the crowm, is not represented in our 

 series, except by isolated (?) brachials, seen only in sections of 

 the pellets. 



Horizon. — L^pper Cambrian. Brachiopod Zone. Roan Horse 

 Gully. 



Class Brachiopoda. 

 Genus Linyulella, Salter, 1861. 



(?) Lingulella, sp, (PI. LIX., Fig. 13). 



Description and Affinities. — Tlie shell is ventral, and shows 

 the impression of a broad pedicle canal on the denuded umbo. 

 It is ovately pentagonal in outline, with slightly divergent sides, 

 and widely curved anterior margin. There is no dorsal valve 

 to indicate its inaequivalve condition or othei'wise, but the width 



1 Vol., 1000, p. 177. 



2 Proc. Acad. Nat. Sci. Philad., 1879, p. 298. 



3 Geol. Surv. Can. -Canadian Organic Remains, dec. iv , 1S59, p. 44, pi. iii., figs. 8a, b. 



