Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: A REVIBW OF THE PROGBESS OF NORTH AMEEICAN IN- VERTEBBATE PALEONTOLOGY FOE 1884. By John Belknap Maecou. In this work I have endeavored to collect the titles of all of the works on North American invertebrate paleontology published during the past year. An attempt has been made to give a brief idea of the contents of each work, the new genera and species described, and the general conclusions of the authors. The alphabetical arrangement by authors seemed, after a good deal of thought, the best method of arrangement and has consequently been adopted. The explanatory notices are placed after each title. The work I hope will prove useful, and I will be glad if those who notice them will call my attention to any omissions. Ami, H. M.Notes on Triarthus spinozus Billings. (Trans. Ottawa . Field Naturalists' Club, No. 4. Ottawa, 1883.) Interesting notes on this Trilobite with two figures, one a copy of Billings's, the other original, with some of the furrows and grooves on the occipital segment imperfectly figured. Beecher, C. E.Ceratiocaridce from the Chemung and Waverly Groups at Warren, Pa. (Rep. of progress, P. P. P., 2d Geol. Surv. Penna., pp. 1-22, pis. i and ii, Harrisburg, 1884.) A very interesting paper on a group of which but little is known. Oives descriptions of two new genera, Elymocaris and Tropidocaris, HI. jiliqua n. sp. and T. bicarinata, T. interrupta, T. alternata n. sp., and also a new species of Echinocaris, E. socialis n. sp. He also redescribes and gives good figures of E. punctata Hall. The figures and descriptions are excellent; a short bibliography of the subject is also given. Billings, W. R.Notes on, and description of, some fossils from the Trenton Limestone. (Trans. Ottawa Field Naturalists' Club, No. 4. Ottawa, 1883.) Describes a ...