262 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 4 



Illaenurus convexus Whitfield. Lower Magnesian. 



Ann. Eept. Geol. Surv. Wis., Whitfield, 1877, p. 66. 



Geol. of Wis., Whitfield, 1882, Vol. 4, p. 203. pi. 4, figs. 3-5. 

 Locality — Baraboo, Wis. 

 Tjpes — Univ. of California. 



ML-enurus quadratus Hall. Upper Cambrian. 



Sixteenth Ann. Eept. N. Y. State Cab. of Nat. Hist., Hall. 1863 r 



p. 176, pi. 7, figs. 52-57. 

 Locality — Osceola Mills, Wis. 

 Types— Am. Mus. of Xat. Hist. 



Hlaenus cuniculus Hall. Niagara (Sil.) 



Twentieth Ann. Eept, X. V. State Cab. of Xat. Hist.. Hall, 1S07. 



p. 377, .pi. 22, (13.), fig. 12. 

 Locality — Wauwatosa, Wis. 

 Type— Am. Mus. of Nat. Hist, 



lllaenus imperator Hall. Niagara (Sil.) 



Geol. Surv. Wis., Eept. of Prog., Hall, 1861, p. 49. 



Eighteenth Ann. Eept. N. Y. State Cab. of Nat. Hist.. Hall, 1864, 



p. 332, pi. 22 (13.), figs. 15-17, and pi. 23. (14.). figs. 2. 3. 

 Locality — Burlington, Wis. 

 Types— Am. Mus. of Nat. Hist. 



Illaenus indeterminatus Walcott. Trenton (Orel.) 



Advanced Sheets. Thirty-first Ann. Kept. N. Y. State Cab. of 



Nat. Hist,, Walcott, 1877, p. 19. 

 Thirty-first Ann. Kept. N. Y. State Cab. of Nat. Hist,. Walcott, 



1879, p. 70. 

 Locality — Platteville. Wis. 

 Types — Museum of Comparative Zoology. Cambridge. Mass. 



iikenus insignis Hall. Niagara. (Sil.) 



Eighteenth' Ann. Eept. N. Y. State Cab. of Xat. Hist., Hall, 1864, 



p. 331. figs. 5. 6 and pi. 22, (13.), figs. 13. 14. 

 Geol. of Wis.. Whitfield, 1882, Vol. 4. p. 305, pi. 21. figs. 6-10. 



Obs. The specimen from which figures 5 and were 

 drawn must have been collected at Bridgeport. 111., 

 as the Wisconsin specimens of this species are not 

 so accurate. 

 Locality — Milwaukee, Wis. 

 Types — Am. Mus. of Nat. Hist, 



