352 CALIFORNIA ACADEMY OF SCIENCES. 



PTYCHOPAKIA. 



- OCCIDENTALS Wai., 1884; Pal. Eureka Dist., Mon. U. S. Geol. Survey, 



vol. 8, p. 51, pi. 10, fig. 5. Eureka Dist., Nev. Tacoiiic. 



Conoceph. ORESTES Hartt, 1868; Acadian Geology, p. 649, fig. 225. 



Katcliff's Millstream, St. John, N. B. Taconic. 



Syn., Conoceph. halli (Hartt) Wai.; Bull. U. S. Geol. Survey, No. 10, 



p. 40. 



Conoceph. thersites (Hartt) Wai.; Bull. U. S. Geol. Survey, No. 

 10, p. 40. 



ORESTES var. THERSITES Wai., 1884; Bull. U. S. Geol. Survey, No. 10, 



p. 40. 

 Syn., orestes Wai., 1884; Bull. U. S. Geol. Survey, No. 10, p. 39, pi. 



5, figs. 3, 3 a. 

 Solenopleura ORESTES Matt., 1887; Trans. Koyal Soc. Canada, vol. 4, 



p. 154, pi. 2, figs. 4 a-e. 



- Pterocephalus OCCIDENTS Wai., 1884; Pal. Eureka Dist., Mon. U. S. 



Geol. Survey, vol. 8, p. 58, pi. 9, fig. 21. Canon east of Hamburg 



Ridge, Nev. Taconic. 



Conoceph. OUANGONDIANA Hartt., 1868; Acadian Geology, p. 651, fig. 



226. EatclifFs Millstream, St. John, N. B. Taconic. 



OUANGONDIANA Wai., 1884; Bull. U. S. Geol. Survey, No. 10, p. 37, 



pi. 5, figs. 4, 4a-f. 



OUANGONDIANA var. AURORA (Hartt) Wai.; Bull. U. S. Geol. Survey, 



No. 10, p. 38, pi. 5, fig. 5. 



Liostracus OUANGONDIANA Matt., 1887; Trans. Royal. Soc. Canada, 

 p. 138. 



- OWENI (M. & H.) Wai., 1884; Pal. Eureka Dist., Mon. U. S. Geol. 



Survey, vol. 8, p. 55, pi. 10, figs. 3, 3 a. (See Agraulus oweni 



M. & H.) Big Horn Mts., Montana. Taconic. 



The following species are referred by Walcott (Mon. U. S. Geol. 



Survey, vol. 8, p. 55) to Ptychoparia oweni: 



ArionellusoweniM.. &H., 1862; Am. Jour. Sci., 2d series, vol. 33, p. 74. 

 Agraulos oweni M. & H., 1864; Pal. Upper Missouri, p. 9, figs, a-c, 



pi. 1, fig. 4. 

 Conocoryphe (Ptychoparia) gallatinensis Meek, 1870; 6th Ann. Rep. 



U. S. Geol. Survey Territories, 1872, p. 485. 

 Crepicephalus(Loganellus) centralisWhit., 1880; Geol. Resources Black 



Hills, Dakota, p. 341, pi. 2, figs. 21-24. 

 Conoceph. OWENI Hall, 1863; 16th Rep. New York State Cab. Nat. 



Hist., p. 155, pi. 8, figs. 17-20. Marine Mills, Wis. Potsdam, 

 Conoceph. PATERSONI Hall; 16th Rep. New York State Cab. Nat. Hist., 



p. 159, pi. 7, figs. 45-46. Tremapleau, Wis. Potsdam. 



- Liostracus PANOPE Wai., 1890; Proc. U. S. Nat. Mus., vol. 13, p. 275, 



pi. 21, fig. 13. Spring Creek Canon, Black Hills, Dakota. 



Taconic. 



