P A R T I I 



CATALOGUE OF TEILOBITES. 



For the geological horizons the author has used the 

 term "Cambrian" for the original Cambrian of Sedg- 

 wick, 1836 (Lower Silurian, Murchison). The term 

 " Laconic " is used for the zone with the Olenellus, Par- 

 adoxides, Olenus and Dicellocephalus faunte. " Silurian" 

 is used for Murchison's Upper Silurian. 



A SYSTEMATIC CLASSIFICATION OF THE GENERA. 

 Agnostidje. 

 Agnostiis Brouguiart, 1822. Hist. Crust. Foss., p. 38. Type, Agnostua 

 pisiformis Linne. Taconic. Cambrian. 



Sec. 1. Parvifrontes. Type, Agnostus brevi/rons Aug. 

 Sec. 2. Lougifrontes. Type, A. punctuosus Aug. 

 Sec. 3. Limbati. Type, A. rex Barr. 



(B) Fallaces. Type, ^. /aZ^ax Liurs. 

 Sec. 4. Lajvigati. Type, A. kevigatus T)&\xa. 

 Sec. 5. Arthrorhachis. Type, A. tardus B&rr. 

 Shumardia Billings, 1862. Pal. Foss., vol. 1, p. 92. Type, Shumardia 

 granulosa Bill. Taconic. 



Microdiscus Emmons, 1856. Am. Geology, vol. 1, pt. 2, p. 116. Type, 

 M. speciosus Ford. Taconic. 



TrINOCLEIDjE. 



Trinucleus Lhlwyd, 1698 (Cryptolithus Green, 1832). Murchison's Silu- 

 rian Syst., 1839, p. 659. Type, Trinucleus Jimhriatus Mnrcli. 



Cambrian. 

 Ampyx Dalmau, 1826. Palisad., p. 53. Type, Ampyx nasutus Dalm. 



Cambrian. Silurian. 

 Sec. 1. Brevifrontes. Tyiie, Ampyx niidus Mnrch. 

 Sec. 2. Longifrontes. Type, A. nasutus Dalm. 

 Sec. 3. Lonchodomas. Type, L. domains Ang. 

 Dionida> Barrande, 1847. Neues Jahrb. fiir Mineral., 1847, pt. 4, p. 391; 

 Syst. Sil. Bohfeme, vol. 1, p. 540. Type, Dionidce formosa Barr. 



Cambrian. 



1. Saltei'ia Wy v. Thompson, 1864. Mem. Geol. Survey United King- 

 dom, decade xi, pi. 7, p. 1. Type, Salteria primieva Wyv. Thorn. 



2. Endyminia Billings, 1862. Pal. Foss., vol. 1, p. 93. Type, En- 

 dymini'i /i><'> H Bill. Cambrian. 



