58 CALIFOKNIA ACADEMY OF SCIENCES. 



American Geology, containing a statement of 



the principles of the science, with full illustrations of 

 the characteristic American fossils. Vol. 1, Parts I, II 

 and VI. Albany, 1855-57, atlas, 17 pis. 



This incomplete work only appeared in three parts, as enumerated 

 above. 



Trilobites. Tacouic System: EUijitocephalus asaphoides Emm. ()lenii< 

 ijlbbosus Dalm. Paradoxides bohemicus. Atojts triUneatus Emm. Micro- 

 discus n. g., M. quadricostaius n. s]). 



Crustacea: Conocephcdus striatus. Harpes. Acidaspis. Trinucleus coii- 

 centricus. Ccdymene senaria, Conrad. Trianthriis beckii Green. Phaco)i< 

 callicephcdus. Illaenus crassicauda, I . trentonensis. Isotelus gigas. Ogi/gi" 

 vetusta. Acidhspis trentonensis. Ceraurns jileurexanthemus, ('. vigilam-. 

 Beyrichia simplex Jones, B. regularis n. sp., B. ciliata n. sp. Agnostiis 

 lobatus. Cytherina subeUiptica n. sp., C. crenulata n. sp., C. subcylindricc 

 n. sp. Dikelocephcdus minnesotensis Owens. Illaenus arcturus Hall. 

 Asaphus marginalis. Isotelus canalis. Asaphuf ohtusiis. Calymene conradi 

 n. sp. Lichas trentonensis, etc. 



Manual of geology, designed for the use of 



colleges and academies. New York, 1860. 



Paradoxides? quadrispinosus . fig. 57; P. macrocej/halus fig. 70; Atop-i 

 punctatus, fig. 71; Microdiscus quadricostatus, fig. 73; Calymene senaria, fig. 

 87; lllmnus trentonensis, fig. 89 (a); /. crassicauda, fig. 89 (b); Triarthrn-'^ 

 beckii, figs. 89 (c) and 91; Isotelus gigas, fig. 89 (d); Beyrichia, Cytherina, 

 Cyproides, fig. 90; Trinucleus caractaci, fig. 93 (1); Hemicripturus, fig. 97 

 (2); Illcenus barriensls, fig. 98 (3); Dcdmania selenurus, fig. 118 (1); Phacopv 

 bufo, fig. 124 (6); Dalmania calliteles, fig. 124 (7); Phacops nupera, fig. 138 

 (2); Cyphaspis girardeauensis, fig. 145(2); Homcdonotus dekayi, figs. 134, 

 135. 



Note A, p. 280, the author remarks: " We now know the following trilo- 

 bites, all of which belong to a slate beneath the Calciferous, viz, : Atoji-^ 

 punctatus, Elliptocephcdus (Paradoxides) asaphoides, Paradoxides thompsoni, 

 P. vermonti, P. macrocephalus, P. ( Pagura) quadrisjnnosus, and Microdis- 

 cus quadricostatus. "' 



Dr. Emmons misprints Pcltnra and uses it in a subgeneric sense to 

 Paradoxides (Pagura) quadricostatus. 



Emmrich (H. F.) De Trilobitis Dissertatio petrefacto- 

 logica quam consensu et auctoritate amplissimi philos- 

 ophorum ordinis, etc. Berolini, 1839, 1 pi., 56 pp. 



