l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



Helcionella pauper (Billings) 



Stenotheca pauper Billings, Canadian Nat., new ser., vol. 6, p. 479, 1872. 

 Stenotheca rugosa paupcra Walcott, lofh Ann. Rep. U. S. Geol. Surv., 

 p. 617, pi. 74, fig. 7, 1891. 



This species must be restricted to the form from Newfoundland. 

 BilHng's type was not figured, but Walcott states that he compared 

 the type with the specimen he figured in 1891. 



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

 ception Bay, Newfoundland. 



Holotype. — Nat. Mus. Canada; plesiotype, U.S.N.M. no. 18312. 



Helcionella foerstei, n. sp. 



Stenotheca rugosa pauper Shaler and Foerste, Bull. Mus. Conip. Zool., 

 vol. 16, p. 29, pi. I, fig. 7, 1888. 



Compared with the specimen Walcott figured as H. pauper, the 

 Massachusetts species is much more curved and has stronger ribs. 

 Lower Cambrian, Hoppin ; North Attleboro, Massachusetts. 

 Holotype.— US MM. no. 96478. 



Helcionella terranovica, n. sp, 



Stenotheca ? rugosa Icvis Walcott (part), loth Ann Rep. U. S. Geol. Surv., 

 p. 617, pi. 74, fig. 5, 1891 (see H. levis). 



This is a much taller and stouter form than the other specimen 

 Walcott referred to his variety levis. This species is stouter and more 

 erect than H. levis and has fewer, much larger, annulations. 



Lower Cambrian, Etcheminian; (loc. 41) Manuels, Conception 

 Bay, Newfoundland, 



Holotype. — U.S.N.M. no. 96479. 



Helcionella striata, n, sp. 



Stenotheca levis Grabau (not Walcott), Occ. Paper Boston Soc. Nat. Hist., 

 vol. 4, p. 641, pi. 31, fig. 15, 1900. 



This form is shaped somewhat like H. terranovica, Ijut the illustra- 

 tion shows pronounced longitudinal striations. 



Lower Cambrian, Weymouth; Pleasant Beach, Cohasset, Massa- 

 chusetts, 



Holotype. — Boston Soc. Nat. Hist. no. 11961. 



Helcionella recurva, n. sp. 

 StcnotJicca pauper Grabau (not Billings), Occ. Papers Boston Soc. Nat. 

 Hist., vol. 4, p. 639, pi. 31, fig. 14, 1900; Grabau and Shimer, N. A. Index 

 Foss., vol. 2, p. 374, fig. 16746, 1910. 



