TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 63 



17446. Aristozoe rotundata Walcott. Cotype. 



Lower Cambrian. Near North Greenwich, Washington 

 County, New York. 



Walcott, Amer. Journ. Sci., (3) XXXIV, 1887, p. 193, pi. 1, fig. 

 9; Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 627, pi. 80, 



17447. Aristozoe troyensis (Ford). Plesiotype. 



Lower Cambrian. Washington County, New York. 



Walcott, Arner. Journ. Sci., (3) XXXIV, 1887, p. 193, pi. 1, fig. 

 8; Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 628, pi. 80, 

 fig. 2a. 



26380. Arthracantha punctobrachiata Williams. Plesiotype. 



Hamilton (Dev.). Thedford, Ontario, Canada. 



Wood, Smithsonian Misc. Coll., Quart., XI/VTI, 1904, p. 81, pi. 

 16, fig. 4. 



43633. Arthroclema armatum Tjlrich. Cotypes. 



Trenton (Ord. ). Cannon Falls, Minnesota. 



Ulrich, Journ. Cincinnati Soc. Nat. Hist., XII, 1890, p. 194, fig. 

 19, I9a-h; Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, 

 Pt. I, 1893, p. 201, pi. 2, figs. S-n, 25, 28-33; pi. 3, fig. 7. 



43415. Arthroclema billingsi Ulrich. Holotype. 



Trenton (Ord.). Ottawa, Canada. 



Ulrich, Geol. Surv. Illinois, VIII, 1890, p. 642; Geol. and Nat. 

 Hist. Surv. Minn., Final Rept., Ill, Pt. I, 1893, p. 197, pi. 2, 

 fig- 7- 



43634. Arthroclema cornutum Ulrich. Cotypes. 



Black River (Ord.). Minneapolis, Minnesota. 



Ulrich, Journ. Cincinnati Soc. Nat. Hist., XII, 1890, p. 193, figs. 

 18, i8a-g. Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, 

 Pt. I, 1893, p. 200, pi. 2, figs. 16-21, 23 



43665. Arthroclema spiniforme Ulrich. Cotypes. 



Stones River (Ord.). Lebanon, Tennessee. 



Ulrich, Journ. Cincinnati Soc. Nat. Hist., V, 1882, p. 161, pi. 6, 

 figs. 10, 10a. 



= Helopora spiniformis. 



43498. Arthroclema striatum Ulrich. Cotypes. 



Black River (Ord.). Minneapolis, Minnesota. 



Ulrich, Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, Pt. I, 

 1893, p. 198, pi. 2, figs. 22, 24; pi. 3, figs. 28-33. 



33068. Arthrolycosa antiqua Harger. Plastotype. 



Upper Coal Measures. Mazon Creek, Grundy County, 

 Illinois. 



Beecher, Amer. Journ. Sci. (3), XXXVIII, 1889, pp. 219-223, 

 figures. 



