70 CALIFORNIA ACADEMY OF SCIENCES. 



2. Honmlonotnti Kiinig ( Trhnerus and JJipleura Green, j k—Dipleura 

 dekayi, B. Trimerus. H. knightU Koiiig., H. delphinocephilus, H. armatus, 

 H. hemcheUi. 



3. Cyphaspis Bnrm. C. claci/rons Dalm. 



4. Phacops Emm. (Pleuracaiithus & Peltura, Milne Edwards). P.lat- 

 ifrons, P. protuberans, P. cuichtops, P. roiundifrons, P. macrophthalmuH, 

 P. odontocephcduH, P. sclerops, P. hautimaimi, P. caudatus, P. mucronatus, 

 P. archnoides, P. siellifer. 



5. Aeonia Bnrm. (Calymene Dalm., Asaphus Emm.) A. diops, A. con- 

 ci»ma Dalm., A. cornuta Goldf. 



6. Illaemis Bnrm. (Bumastus Aut.) A — Illaenus crasskauda, I. gigan- 

 ieua Bnrm. B — Biimastus. /. harriemiK. 



7. Archegouns Burm. (Illcenus Dalm. Asaphus Emm. Calymene H. 

 V. Mey. Phillipsia Fort. ) A — Dysjdanus centrotiis. B — Archegonus cequalis, 

 A. globkeps. 



8. Asaphus Broug. (Asap/hus ,i- Nileus Dalm. Isotelus Dekay. Hemi- 

 crypturus Green). A — Nileus Dalm. A. (N.) armadillo Dalm. B — A. 

 palpehrosus, A.expansus, A. tyrannus, A. raniceps, A. extenatus, A. jila- 

 (ycephalns. 



9. Ampyx Dalm., A. «rt.s«(!«.s- Dalpi., A. mammillatus Sars., A. rostratus 

 Sars. 



10. Trinucleiis Mnrcb. (CryptoUthus Green). T. cataracti, T. granu- 

 latus, T.Jfmhriatns, T.ornatus, T. tessellatus. 



11. Ogygia Brong. O. huchii, O. guetlardi. 



12. Odontoplenra Emm. (Acidaspis Murch.) 0. ovnta Emm., O. ellip- 

 tica Bnrm. 



13. Arges Goldf. A. armatus GolAi. 



14. Bronteus Goldf. (Goldins DeKon.) B. flabelliferGoldi., B. signatus 

 Phil., B. laticauda Wal. 



15. Paradoxides Brong. (Olenus Dalm.) P. boheviicus, P. spinulosus. 



16. Oleniis Bnrm. (Paradoxides and Olenns Ant.) O. gibbosus, O. 

 scrabaeoides, . forficula Sars. 



17. Conocephalns Zenk. C. sulzeri Schloth, C. striatus Emm. 



18. Ellipsocephalns Zenk. E. Hoffi Schloth. 



19. Harpes Goldf. H. ungula. 



Poecilopoda 3. Belinurus Konig, B. trilobitoides Buckl. 



Family 1. Eurypteridae : Eurypterus Dekay, E. remipes, E. lacusiris 

 Harlan, E. tetragonopthalmus. 



Family 2. Cytherinida?: Cytherina Lam., C . balthica Hisinger, C. phas- 

 eolus His. 



Carbonformation und Dyas in Nebraska. Dres- 

 den, 1866, 5 pis. 



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



