XVI THE PALEONTOLOGY OF MINNESOTA. 



westward to the headwaters of the Missouri and is said to embrace the lead-bearing lime- 

 stones of Wisconsin; it also covers a great extent of country to the east, especially around 

 the St. Lawrence river and in New York state. There are 138 species of fossils described; 

 these are principally from the lake region of the United States. He discusses at some 

 length the existence of ambulatory appendages in the trilobites, drawing his conclusions 

 from his examinations of specimens of Calymene on which he finds certain spots or scars 

 which seem to indicate the places of attachment of branchial feet*. The author regards 

 the ' ' systeme magn^sif ere" as forming an upper member of Murchison's Silurian, or as 

 perhaps constituting a separate formation just above the Silurian. The structure, age 

 and formation of the great lake basins are also discussed. 



LIST OF CASTELNAU'S FOSSILS, PREPARED BY CAPT. A. W. VOGDES. 



Crustacea. 



Asaphus micrurus Green, p. 18, Trenton, N. Y. 



A. limulurus Green, p. 18, pi. iv, flg. 1, Lockport, N. Y. 



A. cordieri, n. sp., pi. iv, flg. 2, p. 18, Lockport, N. Y. 



A. caudatus Brong., p. 19, Trenton, N. Y. 



A. edwardiis, n. sp., p. 19, Trenton, N. Y. 



A. murchisoni.pl. iv, flg-. 3, Trenton, N. Y. 



Homalonotus giganteus, n. sp., pi. in, flg. 1, p. 20, Lockport, N. Y. 



H. herculaneus, n. sp., pi. iv, flg. 5, p. 20, Lockport, N. Y. 



H. atlas, n. sp., pi. iv, flg. 4, p. 20, Lockport, N. Y. 



Arctinurus, n. gen., p. 21. 



Arctinurus boltoni Bigsby, pi. in, flg. 2, p. 21, Lockport, N. Y. 



Calymene bufo Green, pi. n, flgs. 1-4, p. 21, Capon prfcs du Potomac, Va. 



Odontocephalus, Conrad, p. 23. 



Acantholoma, idem, p. 23, Clarksville, N. Y. 



Aspidolites, idem, p. 24. 



Dicranurus, idem, p. 24. 



Cephalopoda, 



Orthoceras hercules, n. sp., p. 29, He. Drummond. 



O. conicum, idem, pi. x, flg. 3, p. 29, He. Drummond. 



On propose de substituer il ce nom de'jil employe 1 celui d'O. Castelnau. 



O. flllformis, idem,., pi. x, flg. 2, p. 30, He Drummond. 



Cyrtoceras markoei, n. sp., pi. ix, flg. 3, p. '30, Montmorency fall's. 



Actinoceras richardsoni ? Stokes, pi. vn, flgs. 1-2, He Manitouline (lac Huron);idem, pi. vm, flgs. 



2a-b, p 30. 



A. blainvillei, n. sp., pi. v, flg. 1, p. 31, He Manitouline; idem, pi. vm, flg. 1. 

 A. cordieri, n. sp., pi. v, flg 2, p. 31, He Manitouline. 

 A. baudanti, n. sp., pi. vi, flg. 2, p. 31, He Drummond. 

 A. beaumonti, n. sp., pi. vi, flg. 1, p. 32, He Drummond. 

 A. lyonii? Stokes, pi. rx, flg. 4, p. 32, Lac des Bois. 

 A. dufresnoyi, n. sp., pi. vm, flg. 3, p. 32, He Drummond. 

 A.? deshayesii, pi. vm, flg. 4, p. 32, Bale Verte. 

 Huronia obliqua, n sp., pi. ix, flg. 9, p. 32, He Drummond. 

 H. stokesi, pi. ix, flg. 3, p. 33, Schoharie, N. Y. 

 Sidemina, Castlenau, p. 33. 



Sidemina infundibuliforme Castln, pi. x, flg. 1, p. 33, He Manitouline. 

 Nelimenia, Castelnau. 



Nelimenia incognita, n. sp., pi. x, flg. 4, p. 33, Moutmorency falls. 

 Tentaculites irregularis, n. sp., pi. x, flg. 5, p. 34, Trenton, N. Y. 

 T. regularls, n. sp., pi. x, flg. 6, p. 34, Trenton, N. Y. 

 Goniatites canadensis, n. sp., pi. xi, flg. 7, p. 34. Montmorency falls. 



Late literature on this subject seems to make no reference to this work of Castelnau's. 



