14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



Helcionella sp. 



Stcnotheca riigosa Walcott (part), loth Ann. Rep. U. S. Geol. Surv., p. 617, 

 pi. 74, fig. id, 1891 (see H. nigosa). 



This Atlantic Province form referred to H. riigosa cannot be found 

 in the collections as it evidently never was properly marked as a type. 

 Until the specimen is located, its description cannot be written. 



Lower Cambrian, Etcheminian ; Conception Bay, Newfoundland. 



Helcionella kiaeri, n. sp. 



Helcionella cf. rugosa Kiaer, Skft. Vid. Kristiania, 1916, Mat.-Natur. Kl., 

 vol. 2, p. ig, pi. 2, fig. 3, 1917. 



This is a rather stout, coarse-ribbed form but is not as large as 

 some of the New York species. Its outline is evidently nearly 

 circular. 



Lower Cambrian. StrcnucUa limestone; T^mten, Ringsaker. 

 Norway. 



Holotypc. — Pal. Mus. Oslo. no. 6ib. 



Helcionella norvegica, n. sp. 



Helcionella rugosa acuticosta Kiaer, Skft. Vid. Kristiania, 191 6, Alat.-Natur. 

 KL, vol. 2, p. 20, pi. 2, figs. 4, 4a, 1917. 



This is a small form characterized by strongly curved outlines front 

 and back, with the apex turned beyond 90°. The ribs are sharply 

 angled. 



Occurrence same as preceding. 



Holotypc. — Pal. Mus. Oslo no. 15. 



Helcionella erecta (Walcott) 



Stcnotheca rugosa crccta Walcott, loth Ann. Rep. U. S. Geol. Surv.. p. 617, 

 pi. 74, fig. 4, 1891. 



Lower Cambrian, Etcheminian; (loc. 41) Manuels Brook, Con- 

 ception Bay, Newfoundland. 



Holotypc— \JS.^M. no. 18311. 



Helcionella acutacosta (Walcott) 



Stcnotheca ? rugosa acutacosta Walcott, loth Ann. Rep. U. S. Geol. Surv., 

 p. 617, pi. 74, figs. 2-2b, 1891. 



Occurrence same as preceding. 



Lectotype {fig. 2) and paratype. — U.S.N.M. no. 18310. 



Helcionella curvirostra (Shaler and Foerste) 



Stcnotheca curvirostra Shaler and Foerste, Mus. Comp. Zool., Bull. 16, 

 p. 30, pi. I, fig. 8, 1888; Walcott, loth Ann. Rep. U. S. Geol. Surv., 

 p. 618, pi. 74, fig. 10, 1891. 



