80 CALIFORNIA ACADEMY OF SCIENCES. 



Trilobites of the Hudson River group: Trinuc.le.us concentricus. Olenus 

 asaphoides Emmons, O. undulostriatus n. sp. Thaleops ( Illcenus) ovatus 

 Conrad. Agnostus lobatus 11. sp. 



Palaeontology of New York. Vol. 1. Con- 

 taining descriptions of the organic remains of the lower 

 divisions of the New York system. Albany, 1847, 100 pis. 



Trilobites from the Chazy Limestones: Illcenus arcturus n. sp., /. cm-s- 

 xicauda ? Asaphus ? .obtusus n. sp., A. marginalia n. sp. Isotelus gigas /, 

 /. canalis Conrad Ms. Ceraurus sp.? Cytherina sp.? 



For other Crustacea see Trilobites of the inferior strata. 



- Remarks on the observations of S. S. Halde- 

 man " On the supposed identity of Atops trilineatus with 

 Triarthrus beckii." 

 In Am. Jour. Sci., 2d series, vol. 5, 1848, p. 322, 10 woodcuts. 



Descriptions of new species of fossils, and ob- 

 servations upon some others previously not well known, 

 from the Trenton limestones. 



In Third Eept. N. Y. State Cab. Nat. Hist., 1850, p. 167, 5 pis. (2 eds.) 



Asaphus extans Hall. 



This species was used by Mr. E. Billings for the type of Bathyurus. 



Description of new, or rare species of fossils, 



from the Palaeozoic series. 



In Eept. Geol. Lake Superior Land Dist. (Foster and Whitney), 1851, 

 pt. 2, p. 203, pis. 22-35. 



Harpes escanabica n. sp. Dikelocephalus. Proetus. Phctcops anchiopx 

 Green, P. callicephalus Hall. Asaphus barrandi n. sp. Tracks of a 

 Crustacean. ? 



Paleeontology of New York. Vol. 2. Con- 

 taining descriptions of the organic remains of the lower 

 divisions of the New York system. Albany, 1852, 104 

 pis. 



Trilobites of the Clinton Group. Homalonotusdelphinocephalus. Cybeh 

 /tunctata Briinn. Calymene clintoni Vanuxem, (7. blumenbachii var. ? senaria 

 Conrad. Acidaspis sp.? Phacops trisulcatus Hall. Ceraurus insignia 

 Beyr. Beyrichia lata Conrad. 



Trilobites of the Niagara Group. Bumastus barriensis Murch. Phacopx 

 limururus Green. Ceraurus insignis Beyr. Calymene blumenbachii var. 

 niagarensis Hall. Homalonotus delphinocephalus Green. Lichas boltone 

 Bigsby. Bronteus ? magarensis n. sp. Arges phlyctainodes Green. Proetus 



