XXVI THE PALEONTOLOGY OF MINNESOTA. 



1. Grayish buff-colored magnesian limestone, with numerous casts of fossils. Thickness not given. 



2. Ash-colored argillaceous hydraulic limestone, sometimes with conchoidal fracture. No fossils 



observed. Thickness 5 feet. 



3. Ash-colored limestone, clouded with blue, full of fossils. Contains about 65 per cent, carbonate 



of lime. Thickness, 15 feet. 



In the appendix, Article III, p. 598, is a short discussion of the tables showing the 

 distribution of the fossils collected by Dr. Owen's survey. The following thirty-seven 

 ' ' may be referred to species distributed through the Trenton limestone, Utica slate and 

 Hudson River group of New York, as follows: 



Chaetetes lycoperdon. Leptaena alternata. 



Conularia trentonensis. Leptsena sericea. 



Ambonychia undata. Leptaena deltoidea. 



Ambonychia amygdalina. Atrypa hemiplicata. 



Nucula levata. Atrypa modesta. 



Bellerophon bilobatus. Atrypa capax. 



Pleurotomaria lenticularis. Spirifer biforatus. 



Pleurotomaria subconica. Orthis testudinaria. 



Pleurotomaria umbilicata. Orthis tricenaria. 



Subulites elongata. Lingula quadrata. 



Murchisonia subfusiformis. Echino-Encrinites anatiformis. 



Murchisonia bellicincta. Heterocrinua heterodactylus. 



Murchisonia tricarinata. Calymene senaria. 



Cyrtoceras macrostomum. Isotelus gigas. 



Orthoceras vertebrata. Illasnus crassicauda. 



Orthoceras laqueatum. Ceraurus pleurexanthemus. 



Orthoceras junceum. Phacops callicephalus. 



Leptsena planumbona. Lichas trentonensis. 



"One species, Gonioceras anceps, is peculiar to the Black River limestone; one, the Orthoceras 

 multicameratum, to the Birdseye limestone; and Maclurea magna, to the Chazy limestone." 



In addition to the foregoing his tables also contain the following, referred to the 

 "Shell beds" or Trenton limestone. 



Asaphus jowensis. Orthoceras undulostriatum. 



Illsenurus ovalis. Campulites arcuatus (?) 



Bumastus barriensis. Endoceras proteiforme. 



Lituites undatus. Endoceras subcentrale. 



Lituites convolvans. Trocholites ammonius. 



Cyrtolites ornatus. Orthis subzequata. 



Cyrtolites compressus. Orthis subquadrata. 



Ambonychia orbicularis. Orthis occidentalis (?) 



Orthis bellarugosa. Leptsena deflecta (?) 



Orthis sinuata. Leptsena recta. 



Orthis disparilis (?) Leptaena trilobata. 



Orthis perveta. Selenoides iowensis. 



The following are referred to the age of the Utica slate: 



Asaphus Iowensis. Bellerophon bilobatus. 



Cyrtoceras conicum. Ambonychia obtusa. 



Campulites ventricosum. Spirifer lynx. 



Trocholites ammonius. Spirifer lynx, var. biforatus. 



Maclurea magna. Orthis testudinaria. 



Pleurotomaria lenticularis. LepUena alternata. 



Murchisonia bellicincta. Leptsena sericea. 



Murchisonia abbreviata. Atrypa hemiplicata. 



Murchisonia subfusiformis. Atrypa capax. 



Murchisonia tricarinata. Lingnla quadrata. 



The following are referred to the age of the Hudson River group. 



Calymene senaria. Endoceras cuvieri. 



Cyrtoceras macrostomum. Pleurotomaria subconica. 



Orthoceras vertebrale. Pleurotomaria biles. 



