Genus Agnostics. — Yogdes. 379 



Hist. The memoir describes the fossils of the Dikel»cephalus zone of 

 Wisconsin. In this work we have illustrations and descriptions of 

 Agnostus josepha, A. parilis and A. disparilis. The first species ap- 

 proaches A. cyclopyge Tull. of the Olenus zone of Sweden. The second 

 is of the type Lsevigati of which A. Un-igatus Dalm. is its nearest congen- 

 eric form. Dr. Shumard described in the Am. Jour. Sci., vol. 32, 1861, 

 p. 218, Agnostus coloradensis from Burnet county,. Texas. This species is 

 of the type A. neron H. & W. 



1864 — Salter in the Mem. Geol. Survey, Decade XI, describes five new 

 species of the genus as follows: Agnostus p>rinceps alsovars. ornatus ard 

 7'udis (Olenus zone). (This species is of the type A. atauus, gihhus, punc- 

 tuosus, ainericanus), Agnostus maccoyii. Upper Llandeilo Flags, Wales, 

 A. limbatus, Caradoc, A. morea, Lower Llandeilo, A. tj-itiodus, syn. of A. 

 agnostiformis M'Coy, A. trisectus, Upper Lingula. (This species occurs 

 at Andrarum with PeUura2Jid.SpTnerophthalrnus). 



1865 — Billings in the Palaeozoic Fossils of Canada, vol. 1, redescribes 

 A. (onericanus, A, orion and A. canadensis. The author adds two new spe- 

 cies to the list from the so-called Quebec group of Newfoundland, 

 Agnostus galha, and A. fahicus. The former species differs but slightly 

 from A. tardus Barr., Etage D, in Bohemia. The latter approaches A. 

 lentiformis Ang., Kegio C, of Sweden. 



1866 — Schmidt describes a new species in the Bull. Acad. Sci., St. 

 Petersb , vol. 30, 1866, p. 505, fig. 45, Agnostus cyckanoicskii. 



1866— Linnarsson describes a new species in Om de Siluriska bildnin- 

 garne i Mellersta ^Vestergotland; Agnostus affinis from the zone with 

 Paradoxides tessini. 



1867 — Belt in the Geol. Mag., vol. 4, p. 294, describes Agnostus nodosus 

 and .4. pisiformis var. obesus, from the "Upper Cambrian" of Wales. 

 Tullberg remarks that A. nodosus Belt is probably identical with A. re- 

 ticulatus Ang. The author illustrates a broad and narrow form of A. 

 pisiformis var. obesus. In vol. 5, 1868, of the same inagazine, the author 

 describes Agnostus obtusus from the Upper Dolgelly and A. harlowii from 

 the Tremadoc. 



1868 — Barrande describes Agnostus bavaricus, in Fauna Silurienne des 

 environs de Hoff en Baviere, p. 32, figs. 46-47. 



1869 — Linnarsson, Om Vestergotland Camb. «& Sil. aflagringar. The 

 author describes 8 species of Agnostus including the following new 

 species, A. gibbus, A. 2)arvifroas^ A. sidenbladhi, and A. fallax. The first 

 two species occur with Paradoxides tessini at Andrarum. Agnostus 

 sidenbladhi ranges higher up in ihe Ceratopyge chalk. 



Sjogren in Om nagra forsteningar i Oland Kambriska lager 1871, de- 

 scribes Agnostus regius from the zone with Paradoxides olandicus. 



1871— Hicks in the Quart. Jour. Geol. Soc, vol.27, 1^1, p. 400, de- 

 scribes a new species, Agnostus cambriensis. 



1872— Meek in the sixth Report U. S. Geol. Sur. Territories, p. 664, 

 gives the name of Agnostus maladensis to a species from Malade City,. 

 Utah; and that of Agnostus bidens to one from Gallatin City, Montana. 



1872— Hicks in the Quart. Jour. Geol. Soc, vol. 28, 1872, p. 174, de- 



