380 The American Geologist. june,i8j« 



scribes five species, illustrating a new one under the name of Agnos- 

 tus eskriggei from near Dolgelly, Wales. This article also contains de- 

 scriptions of Agnostus davicUs Salt., A scutaUs Salt., A. scarceoides Salt, and 

 A. harrandei Salt. 



1872 — Ford illustrates an imperfect trilobite under the name of Ag- 

 nostus nohilis 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 be a 

 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, 18T2: Agnostus caducus, A. perruga- 

 tus and A. similaris. 



1876— Kayser, Beitnige zur. Geol. «fe Paheont. der Argentinischen Re- 

 publik, p. 5. The author describes Agnostus tilcuryensis from the 

 Olenus zone. 



1877 — White in his Preliminary Report for 1874, also in the final Re- 

 port U. S. Geol. Sur., west 100th Mer., vol. 4, 1877, describes Agnostus in- 

 terstridus 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. tmiddosus. 



1878 — Hartt, in Dawson's Acadian Geology, 2d Edition, describes A. 

 acadicus and A. similis ; the latter species is now included as a synonym 

 of A. acadicus. 



1878— Brogger, Om Paradoxide^skifrene ved Krekling, describes 14 

 species including the following new forms, Agnostus gihhus var. hyhrida 

 A. JijenUJi, A. natliorsti, A. incertus, A. pavifrons var. mammilata, also var. 

 nepos, A. nudus var. marginntas, A. p^unctuosus var. ajfinis and A. trunca- 

 tes. 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. lundgre?ii, A. cyclopyge, A. pusillus. Group Ltievigati — A. cicer. 

 Group Limbati — A. quadratus. 



Dames in Richthofin's China, vol. 4, p. 27, pi. 2, describes Agnostu» 

 chinensis from the Olenus zone. 



1882— Holm, in Kongl. Svenska vet. Akad. Handl., vol. 6, No. 9, de- 

 scribes A. torquisti. 



1884— Walcott in Pahi?ont. 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. natliorsti 

 Brogger. 



1885— Matthew in the Trans. Roy. J^oc. Canada, vol. 3, describes 10 

 species from the Paradoxides zone of St. John: Agnostus regulus, A. 

 partihus, A. vir, also var concinnus, A. acadicus Hartt, var. decliris, A. tes- 

 sella, A. umbo, A. ohtusilohus and A. acutilohus. 



