il CALIFORNIA ACADEMY OF SCIENCES. 



Ellipsocephalus hoffi, Schloth. Asaphusexlenuatus\W&\\\. Acidaspis verneuilli 

 Barr., A. leonhardi Barr. Dalmanites mcialis Barr. Ej'e of Bronteus 

 hrongniarti. Illcejius taur'icornis, etc. 



Giebel (C.) Die silurische Fauna des Unterharzes. 



In Abhandl.Nat. Vereins Sachsen u. Thtiringeu, vol. 1, 1858, p. 1, 7 pis. 



Harpes hischofi A. Roem. Proetus pictus u. sp. Cyphaspis hydrocephala 

 Romer. Phacopn angustice.ps n. sp., P. ? sternbergi n. sp. Dalmanites 

 tuberculatus n. sp. lAchas nexlohaUis Riimer. Acidaspia selcana Romer, 

 .1. hercynice n. sp. Bronteus bishofi u. sp. 



Goldfuss (A.) Observation sur la place qu'occupent 

 les Trilobites dans le r^gne animal. 



In Annales Sci. Nat. Paris, vol. if), 1828, p. 8*2, pl.i2. 

 AHaphuH. Calymene. 



Catalogue des Trilobites. 



In Handbueh der Geognosie von de la Becbe, 1832. 



This list was copied by Dr. Jacob Green in his "Monograph of the 

 Trilobites of North America," p. 20. 



Beitrage zur Familie der fossilen Crustaceen. 



In Nova Acta Physico Med., vol. 19, 1839, Breslau, p. 3o3, pi. 33. 



Harpes n. g. Arges u. g. Bostrichopus n. g., B. antiquum n. sp. Arges 

 urmatus n. sp. Harpes macroce.phalus u. sp. Brontes Jtabel'tifer n. sp. II- 

 hejius ? Iriacanlhtis n. sp. 



Systematisclie Uebersicht des Trilobiten und 



Beschreibung eniger neuen Arten. 



la Nei;es Jahrbuch fiir Mineral., 1843, p. 537, pis. 4-6. 

 New genera Anthes, Gerastos and Symphysiirus. 



The author classifies 204 species under 31 genera principally on the 

 characteristics of the eyes as follows : 



I. Without ej'es. a— without segments. 1, Agiiostus Brong. b — with 

 segments. (a) segments of the pygidium effaced. 2, Ampyx. 3, Crypto- 

 lithus. 4, Arges. 5, Olenus. (b) segments of the pygidium distinct. 6, 

 Zethus. 7, Otarion. 



II. Eyes smooth or finely reticulated. A — Thorax and pygidium indis- 

 tinctly separated, (a) The last segment without appendages. 8, Para- 

 doxides. 9, Amjihion. 10, Harpes. (b) The last segment with append- 

 ages. 11, Bronteus. 12, EllqyHOcejjhalus. 13, Ceraurus. 



, B — Pygidium clypiform, axis and sides not segmented, a — without dorsal 

 grooves. The axis and sides indistinct. 14, Nileus. 15, Bumastus. b — 

 Dorsal grooves faint. Grooves of the sides invisible on the pygidium. 

 16, Dipleura. c — Dorsal grooves prolonged even to the pygidium. 17, 

 Symphysurus. 18, Illceuus. 19, Isotelus. Pygidium clj'piform, axis seg- 



