880 The American Geologist. June, 1892 
scribes five species, illustrating a new one under the name of Agnos- 
tus eskrigged from near Dolgelly, Wales. This article also contains de- 
scriptions of Aynostus davidis Salt., A scutalts Salt., A. scarwoides Salt. and 
A, barrandet Salt. 
1872—Ford illustrates an imperfect trilobite under the name of Ag- 
nostus nobilis in the Amer. Jour. Sci., vol. 3, 1872, p. 421. This species 
is from the Olenellus zone near Troy, New York, and may prove to bea 
species of the genus Microdiscus, which occurs in the same locality. 
1872—-Barrande describes three new species from Etage D, in the 
Supplement Syst. Sil. Bohm., vol. 1, 1872: Agnostus caducus, A. perruga- 
tus and A. similaris. 
1876— Kayser, Beitriige zur. Geol. & Paleont. der Argentinischen Re- 
publik, p. 5. The author describes Agnostus tilewryensis from the 
Olenus zone. 
1877— White in his Preliminary Report for 1874, also in the final Re- 
port U. 8. Geol. Sur., west 100th Mer., vol. 4, 1877, describes Agnostus in- 
terstrictus from Antelope Springs, Utah. This species is related to A. 
integer Beyr. 
Hall & Whitfield in U.S. Geol. Sur. 40th Par., vol. 4, 1877, describe 
four new species from the Dikelocephalus zone of Nevada: Agnostus 
communis, A, neon, A. prolongus, A. tumidosus. 
1878—Hartt, in Dawson’s Acadian Geology, 2d Edition, describes A. 
acadicus and A, similis; the latter species is now included as asynonym 
of A. acadicus. 
1878—-Brogger, Om Paradoxidesskifrene ved Krekling, describes 14 
species including the following new forms, Agnostus gibbus var. hybrida 
A, kjerulfi, A. nathorsti, A. incertus, A. pavifrons var. maminilata, also var. 
nepos, A. nudus var. marginatas, A. punctuosus var. uffinisand A, trunca- 
tus. All these species occur in the Paradoxides zone. 
1880—Tullberg, in his excellent monograph on the Agnostus species 
in the Cambrian formation at Andrarum, illustrates and describes 28 
species of this genus with the following new species: Group Longi- 
frons—Agnostus fissus Lund, MSS., A. atavus, A. intermedius, A. elegans, 
A. lundgrent, A. cyclopyge, A. pusillus. Group Levigati—A. ezcer. 
Group Limbati—A. quadratus. 
Dames in Richthofin’s China, vol. 4, p. 27, pl. 2, describes Agnostus 
chinensis from the Olenus zone. 
1882—Holm, in Kongl. Svenska vet. Akad. Handl., vol. 6, No. 9, de- 
scribes A. torqguisti. 
1884— Walcott in Paleont. Eureka Dist. describes six species includ- 
ing two new species: Agnostus seclusus and A. richmondensis. The first 
species is of the type A. parvifrons Linrs. and the second of A. nathorsté 
Brégger. 
1885—Matthew in the Trans. Roy. Soc. Canada, vol. 3, describes 10 
species from the Paradoxides zone of St. John: Agnostus regulus, A. 
partibus, A, vir, also var concinnus, A. acadicus Hartt, var. declivis, A. tes- 
sella, A. umbo, A. obtusilobus and A. acutélobus. 
