84 CALIFORNIA ACADEMY OF SCIENCES. 



Geol. Survey Wisconsin, vol. 1, 1862, p. 425. 



Dikelocephalus mhinesotensis, D. pephiensis. Asaphus barrandi, A. (Iso- 

 telus) fjigas. Dalmmiia vigilans, D. meta n. sp. Calymene mammtllata 

 u. sp. Acklaspis danai n. sp. 



On a new Crustacean from the Potsdam sand- 



tone. A letter addressed to Principal Dawson, dated 

 Albany, Oct. 31, 1862. 



In Canadian Naturalist, vol. 7, 1862, p. 443, figure. See The Geologist, 

 vol. 6, London, 1863, p. 247, figure. 

 Aglaspis n. g. (A. harrandi Hall.) 



— On the occurrence of Crustacean remains of 



the genera Ceratiocaris and Dithyrocaris, with a notice 

 of some new species from the Hamilton group and Gen- 

 esee slate. 



In Sixteenth Kept. New York State Cab. Nat. Hist., Albany, 1863, p. 71, 

 plate. 



Ceratiocaris armatus n. sp., C. longicaudtis n. sp., C. ? punctatus n. sp. 

 Dithyrocaris neptuni n. sp. 



Preliminary notice of the fauna of the Pots- 



dam sandstone, with remarks upon the previously known 

 species of fossils, and description of some new ones 

 from the sandstones of the Upper Mississippi Valley. 



In Sixteenth Kept. New York State Cab. Nat. Hist., 1863, p. 119, 6 pis. 

 Siipplementary note, p. 110. 



TriarthreUa n. g. Chariocephalus n. g. Ptychaspis n. g. Illamurus n. 

 g. Pemphirjaspis n. g. Aglaspis n. g. 



Descriptions of Dikelocephalus minnesotensis Owen also var. limbatus, 

 D. minnesotensis var. D. pephiensis Owen, D. spiniger n. sp., D. misa 

 n. sp., D. osceoia n. sp. Conocephaliies miwor Shuniard, C. minutus Brad- 

 ley, C.eos n. sp., C.perseus n. sp., O. shumardin. sp., O. nasutusn. sp., C. 

 oiveni n. sp., G. eryon n. sp., G. anatinus n. sp., G. patersoni n. sp., G. ? 

 hinodosus n. sp., G.iuinonan. sp., G. ioioensis Owen., G. tvisconsensis Owen, 

 C. hamulus Owen, G. diadematus n. sp. Arionellus hipunctatus Shumard. 

 Ptychaspis miniscaensis Owen, P. granulosa Owen. P.?sp. Ghariocephaliis 

 ivhitfieldi n. sp. Illcenurus quadratus n. sp. TriarthreUa auroralis n. sp. 

 Agnostus josepha n. sp., A. parilis n. sp., A. disparilis n. sp. Aglaspis 

 barrandi n. sp. Pemphigaspis bullata n. sp. Amphion ? matutina n. sp. 

 Gonocephalites ? (Arionellus ?) dorsalis n. sp., G. optatus n. sp. Lichus 

 grandis (subgenus / Terataspis) L. armatus, L. boltoni, L. nereus n. sp. 



