52 CALIFORNIA ACADEMY OP SCIENCES. 



Recent explorations in the Wappinger Valley 



limestone and other formations of Dutchess county, New 

 York. 



In Am. Joiir. Sci., 3d ser., vol. 28, 1889, p. 139, plate. 

 Fossiliferous strata of the paradoxides zone at Stissing Leperditia ebenina 

 n. sp. Olenoides sttssingensis n. sp. 



Eaton (Amos). Geological Equivalents. 



Description of Ogygles latissimus and Cancer trilobioides. 



In Am. Jour. Sci., 1st ser., vol. 21, 1832, pp. 135, 136, note. 



Trilobites. 



Am. Jour. Sci., 1st ser., vol. 22, 1832, p. 165. 



Brongniartia n. g. 



We learn from reference to Dr. Amos Eaton's description and figures 

 given in his "Geological Text-book," p. 33, pi. 1, lig. 3 (2d ed., 1832), 

 that the original of Brongniartia carcinodea Eaton, was the same as that 

 afterwards described by Dr. Jacob Green (Monthly Am. Jour. Geology, 

 vol. 1, June, 1832; also Mon. Tril. N. A., p. 87, pi. 1, fig. 6, cast 34), as 

 Triarthrus bechii. 



Geological text-book for aiding the study of 



North American geology; being a systematic arrange- 

 ment of facts collected by the author for his pupils, etc. 

 2d ed., 5 pis. June 15, 1832. 



The following species are described in this work, pp. 31-34: Genus 

 ^'(Jalamena," Cblumenbachii(Calymenesenaria Conrad), pi. 2, fig. 19; gemas^ 

 Asaphus, A. hatismannii, A. caudalus ( Dalmanitea limulurus Green), pi. 2, 

 lig. 18; A. selenourus (Dalmanites selenurus Eaton), pi. 1, fig. 1; genu& 

 Brongniartia, B. platycephala ( Homalonotvs dekayi Green), pi. 2, fig. 20; 

 B. imtelea (Asaphus platycephalus Stokes), pi. 2, fig. 22; B. carcinoida 

 ( Triarthrus becki Green), pi. 1, fig. 3; genus Nuttainia, N. concentrica 

 ( Trinucleus concentrica Eaton), pi. 1, fig. 2; N. sparsa ( Homalonotus dekayi 

 Green). 



Eichwald (Eduard). Observationes geognostico-zo- 

 ologicEe per Ingriam marisque Baltic! Provincias nee 

 non de Trilobites. Casani, 1825, 4 pis. 



The author hei-ein describes and figures eight species of Lower Silurian 

 Trilobites under the new generic term Cryptonymus. In his later work 

 (" Lethcea Rossica, " p. 1449) the first three are referred to the genus Asa- 

 phus, viz.: Cryptonymus schlotheimii to Asaphus schlotheimii, Cryp. loeissil 

 to Asaphus iceissii, Cryp. panderi to Asaphus expansus Wahl. The last five 

 are classed as follows: Cryp. lichtensteinii under Niobe lichentsteinii, Cryp. 



