274 CALIFORNIA ACADEMY OF SCIENCES. 



ASAPHUS. 



MARGiNALis Emmous, 1S55; Am. Geol., vol. 1, pt. 2, j). 235, pi. 3, 



fig. 16. 



Isotelus MAXiMus Locke, 1S38; 2d Aim. Eep. Geol. Survey Ohio, p. 



246, figs. 8, 9. Trenton and Hudson. 



Syn., Isotelus megistos Locke, 1841; Trans. Am. Assoc. Geol. Nat., i>. 



221, pi. 6. 



Isotelus meglstos Locke, 1842; Am. Jonr. Sci., 1st series, vol. 



42, p. 366, pi. 3. 

 Isotelus meg/stos Meek, 1873; Pal. Ohio, vol. 1, p. 157, pi. 14, 



fig. 13. 

 Isotelus megistos Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 



1, p. 137. 

 Asaphus megistos ^\'a\., 1884; Science, March 7, vol. 3, p. 200, 

 fig. 1. 

 Asa/'hus megalopthalmus Troost, 1840; 5th Geol. Eejj. Tennessee, j). 57. 

 This is a species of the genus Phacops. 



MIOROPLErRUS Green, 1835; Suppl. Mou. Tril. North America, p. 21, 



cast No. 41. 



micrxirus. (See Dalmaiiites micrurus.) 



■ mor)-isi Bill., 1865; Pal. Foss., vol. 1, p. 272, fig. 257, syu. to Asaphus 



huttoni Bill. 

 murchisoni Castelnau, Essai Sys. Sil., 1843, p. 19, pi. 4, fig. 3. Buthy- 



nrus'.i murchisoni . Trenton. 



mi/rmecoj>horus. (See Dalmcmites inyrmecophorus.) 



uasiitus. (See Dalmanites nasutus.) 



/ nodostriatus Hall, 1847; Pal. New York, vol. 1, p. 248, pi. 01, figs. 



1 a, b. (See Bathyurus extans Hall.) 



NOTANS Bill., 1866; Catalogue Silurian Foss. Anticosti, p. 25, fig. 8. 



cf. Asaj'hus maximus Locke. English Head. Hudson. 



? OBTusus Hall, 1847; Pal. New York, vol. 1, p. 24, pi. 4 his, fig. 14. 



Chazy village, Clinton county, N. Y. 



OBTusrs Emm., 1855; Am. Geol., vol. 2, pt. 2, p. 236, pi. 3, fig. 14. 



PELOPS Bill., 1865; Pal. Foss., vol. 1, p. 317, fig. 304. Bedford, in 



the bed of Pike Kiver, and upper end of the island of Orleans . 



Quebec. 



PLATYCEPHALus Stokes, 1823; Trans. Geol. Soc. London, 2d series, 



vol. 1. p. 208, pi. 27. Canada, New York, Kentucky, etc. 



Trenton. 

 Syn., Isotelus gigas Dekay, 1824; Annals Lyceum Nat. Hist. New 

 York, vol. 1, p. 176, pi. 12, fig. 1. 

 Isotelus planus Dekay, 1824; Annals Lyceum Nat. Hist. New 



York, vol. 1, p. 178, pi. 13, fig. 7. 

 Asaphus gigas Dalm., 1826; Pala^ad., p. 70. 

 Asa]>h us gigas nud planus Dahn., 1826; PaUvad., ji. 70. 



