70 CALIFORNIA ACADEMY OF SCIENCES. 



2. Homalouotus Koiiig (Trimerus aud Dipleura GreeiiJ k—Diplcura 

 dekayi, B. Trimerus. H. kniijhtii Kbnig., H. delj^hinocephihis, H . armdtus, 

 H. herscheUi. 



3. Cyphaspis Burm. C. clavifrons Dalm. 



4. Phacops Emm. (Pleuracanthns & Peltura, Milne Edwards). P. hit- 

 ifrons, P. protuberant, P. auchiops, P. roiundifrons, P. macrophthalmits, 

 P. odontocephalm, P. sclerops, P. hansmann't, P. caudcdiifi, P. mucronatus, 

 P. archnoides, P. utelUfer. 



5. Aeonia Biirm. (Calymene Dalm., Asaphus Emm.) A. diops, A. eon- 

 cM«9ia Dalm., A. cornuta Goldf. 



6. Illaeuiis Biirm. (Bnmastus Aut.) A — Illaenus crassicauda, I. <jig<ui- 

 tenn Burm. B — Bnmastus. /. barriensis. 



7. Archegoniis Burm. (lUcenus Dalm. Asaphus Emm. Calyme.ne H. 

 T. Mey. PhiUipslaFovt.) A — Dysplcmuscejitroiiis. B — Archegonus ceqnalis, 

 A. globiceps. 



8. Asaphiis Brong. (Asaphus ((• Nileus Dalm. Isoielun Dekay. Hemi- 

 crypturus Green). A — Nileus Dalm. .-1. (N.) armaddlo Dalm. B — A. 

 pcdpebrosus, A. expcmnus, A. tyrannus, A. ranice.ps, A. extenntun, A. pla- 

 tycephalus. 



9. Ampyx Dalm., A. »rt,sH^«.s' Dalm., A. maminUlatus Sars., A. rostratns 

 Sars. 



10. Trinnclens Murch. (CryptoUthus Green). T. cataract), T. graim- 

 latus, T. Jfmbriatus, T.orncUus, T. tesnellatus. 



11. Ogygia Brong. O. buchii, 0. guettardi. 



12. Odontoplenra Emm. (Acidaspis Murch.) 0. ovnta Emm., 0. el/ip- 

 tlca Biirm. 



13. Arges Goldf. A. armatus Goldt. 



14. Bronteus Goldf. (Goldius DeKon.) B. flabelUfer Goldf., B. signatn.'^ 

 Phil., B. laticauda Wal. 



15. Paradoxides Brong. (Olenus Dalm.) P. bohemicus, P. spinuloaus. 



16. Olenus Burm. (Paradoxides and Olenus Aut.) O. gibbosua, 0. 

 scrabaeoides, O.forficula Sars. 



17. Conocephalus Zenk. C.sulzeri Schloth, C. striatum Emm. 



18. Ellipsocephalus Zenk. E. Hoffi Schloth. 



19. Harpes Goldf. H. nngula. 



PcBcilopoda 3. BeUnurus Konig, B. trilobitoides Buckl. 



Family 1. EurypteridcB: Eitrypterus Dekay, E. remipes, E. lacu.stri.s 

 Harlan, E. tetrago7iopthalmn.t. 



Family 2. Cytherinid*: Cylhcriua I^am., C.baUhkri 'H.isingev, C pIiaK- 

 eoliis His. 



Carbonformation und Dyas in Nebraska. Dres- 

 den, 1866, 5 .pis. 



Phillipsia sp. ? Cythere nebrajicennii n. sp., C. cyclas ? Keys var. 



