378 The American Geologist. June, 1892 
names of Battus nudus and Bb. integer. The discovery of an entire speci- 
men by this author removed'the doubts regarding the affinities of these 
fossils with the order Trilobita. 
The investigations made by M’Coy in 1846, Syn. Silurian Fossils of 
Ireland, p. 56, added the new genus 7rz/nodus and one new species, 7’. 
agnostiformis. The non-adoption by paleontologists of 7rinodus, and 
the imperfect illustration of this species have caused several identical 
forms to be classed under new names such as Agnostus converus Salt. 
A, trinodus Salt. and A. tardus Salt., Brit. Pal. Foss. 1851, p. 141 (not Bar- 
rande’s species). The species ranges high up in the geologic column as 
it approaches its extinction, in the zone with the genus Asaphus and 
Trinucleus. 
Barrande described in his Preliminary work on the Silurian System 
of Bohemia, 1846, pp. 14 and 35, nine new species under this genus; 
which he reduces to six in his finai great work on the Bohemian trilo- 
bites. Etage C with Paradozides bohemicus contains—Agnostus integer 
Beyr., A. granulatus Barr., A. nudus Beyr., A. bibullatus Barr. and A. rex | 
Barr. Etage J) with Asaphus nobilis contains Agnostus tardus Barr. 
Corda, Prodrom 1847, reclassifies the genus into seven new genera and 
29 species. All the genera and species have been referred to well 
known Bohemian species and genera. 
In the Mem. Geol. Survey, vol. 2, part 1, p. 351, pl. 8, Salter & Phillips 
reproduce under the name of Agnostus trinodus the Irish species which 
M’Coy described as 7rinodus agnostiformis. The authors also describe a 
variety of this species as connerus. 
1851—Angelin describes and figures 12 species from Sweden, Paleont. ° 
Scand., p. 5, pl.6. Regio A (Olenus zone). Agnostus pisiformis Linné, 
A. levigatus Dalm., A. reticulatus Ang., Regio B (Paradoxides forchham- 
meri zone), Agnostus plaunicauda Ang., A. exrsculptus Ang., A. punctuosus 
Ang., A. aculeatus Ang., A. brevifrons Ang., A. glandiformis Ang., A. bituber- 
culatus Ang., Regio C (Asaphus zone), Agnostus lentiformts Ang., Regio 
D., Agnostus glabratus Ang. 
The first North American contribution to Agnostus was made by Bil- 
lings in 1860, Canadian Nat., vol. 5, p. 802, in which he describes from 
the so-called Quebec group, three new species, Agnostus americanus, A. 
orion and A. canadensis. These species are republished in Paleozoic 
Fossils of Canada, vol. 1, 1865, p. 395. Agnostus americanus is of the type 
Longifrontes, congeneric with A. trisectus Salt. which occurs at An- 
drarum with Peltura and Sphwrophthalmus. A. orion differs from A. pist- 
formis by having the glabella proportionally shorter. The same name 
was used by Barrande in 1846 for a species of the genus. 
1860—Eichwald, Lethea Rossica, vol. 1, p. 1351. The author describes 
four species, two of which are for the first time illustrated—Agnostus para- 
doxus Eichw. and A. nodiger, n. sp. Eichwald refers A. boeckii to A. 
exsculptus Ang. The two new species are from the Asaphus zone. 
1863—An important contribution to American paleontology was pub- 
lished during this year by James Hall; entitled Preliminary notice of 
the fauna of the Potsdam Sandstone, 16th Report N. Y. State Cab. Nat. 
