TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 59 



1468S. Archaeocyathus atlanticus Billings. Plesiotypes. 



15301. Lower Cambrian. L'Anse au Loup, Labrador and Silver 



Peak, Nevada. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 73, pi. 3, figs. 

 i-2a. 



=Spirocyathus atlanticus. 



15302. Archaeocyathus billingsi Walcott. Holotype. 



Lower Cambrian. L'Anse au Loup, Labrador. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 74, pi. 3, figs. 

 3-3C- 



= Coscinoc3'athus billingsi. 



18352. Archaeocyathus ( Archaeocyathellus ) dwighti Walcott. 



Cotype. 

 Lower Cambrian. Troy, and Washington county, New 

 York. 



Walcott, Proc. U. S. Nat. Mus., XII, 1889, p. 34; Tenth Ann. Rept. 

 U. S. Geol. Surv., 1890, p. 601, pi. 54, figs. 4, 4a. 



15304. Archaeocyathus profundus (Billings). Plesiotype. 



Lower Cambrian. L'Anse au Loup, Labrador. 



Walcott, Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 600, pi. 52, 

 figs, i-ic; pi. 53, figs, i-ib; pi. 54, fig. 3. 



See Ethmophyllum profundum. 



15306. Archaeocyathus (Archaeocyathellus) rarus (Ford). 



Plesiotype. 

 Lower Cambrian. Troy, New York. 



Walcott, Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 601, pi. 54, 

 figs. 2, 2a. 



See Ethmophyllum rarum. 



15305. Archaeocyathus ( Archaeocyathellus )rensselaericus (Ford). 



Plesiotypes. 

 Lower Cambrian. Troy, New York. 



Walcott, Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 600, pi. 54, 

 figs. i-ie. 



See Ethmophyllum rensselsericum. 



43416. Archimedes communis TJlrich. Cotypes. 



Chester (Miss.). Sloans Valley, Pulaski County, Ken- 

 tucky. 

 Ulrich, Geol. Surv. 111., VIII, 1890, p. 573, pi. 63, figs. i-id. 



43736. Archimedes compactus TJlrich. Cotypes. 



Chester (Miss.). Sloans Valley, Pulaski County, Ken- 

 tucky. 

 Ulrich, Geol. Surv. 111., VIII, 1890, p. 572, pi. 63, figs. 2, 2a. 



44097. Archimedes distans Ulrich. Cotypes. 



Chester (Miss.). Chester, Illinois. 



Ulrich, Geol. Surv. 111., VIII, 1890, p. 578, pi. 63, figs. 9-9D. 



