CONTEJS'TS Continued. 



H. C. Chapman, M.D. Rete Mirabile in Bradypus Didactylus 95 

 Thomas G. Gentry. On Habits of some American Species of 



Birds 96 



Thomas Meehan. Chanjre of Habit in Smilacina bifolia . 115 

 Edward D. Cope. On the Genus Storeria . . . .116 



Edward D. Cope. Synopsis of Geological work during 18*73 . 116 



Persifor Frazer, Jr. Description of a Coal-cutting Machine 117 



James Lewis, M.D. Description of a new species of Helix . 118 

 Edward D. Cope. On some Batrachia and Nematognathi 



brought from the Upper Amazon by Prof. Orton . . 120 

 Thomas Meehan. Dimorphism in the Leaves of Acer Penn- 



sylvanicura, Lin. ......... 138 



Joseph Leidy, M.D. On Pectinatella magnifica . . . 139 



Joseph Leidy, M.D. On a Parasitic Worm of the House Fly 139 



Joseph Leidy, M.D. Notice of some Fresh-water Infusoria . 140 



Edward J. Nolan, M.D. Obituary Notice of Dr. Slack . . 141 



Joseph Leidy, M.D. Notice of a Remarkable Amoeba . . 142 

 Joseph Leidy, M.D. On the Mode in which Amceba swallows 



its Food 143 



Joseph Leidy, M.D. On the Motive Power of Diatomes . 143 



J. Gibbons Hunt, M.D. On Excretory Ducts in Nepenthes . 144 



Joseph Leidy, M.D. Remarks on Sponges .... 144 



Prop. Leeds. On a Fulgurite from Fayetteville, N. C. . . 145 



Prof. Leeds. On a sudden rise of Temperature in -a Lead Mine 145 



Thomas Meehan. Change of Habit through Fungoid Agency 146 

 Edward D. Cope. Notes on the Santa 4 Marls, and some of 



the Contained Vertebrate Fossils 141 



