﻿H. S. Williams — Zamellibrcmchiata and Species-making, 193 



Glossites (type, Olossiies lingualis Hall), Elymella (type, Ely- 

 mella nuculoides Hall), Protomya (type, Protomya oblonga Hall), 

 one subgenus, Palceosolen (type, Orthonota siliquoidea Hall), 

 and 79 new species. The drawing and engraving are excellent; 

 and, next to having the type specimens, these illustrations 

 are of great value to paleontologists, who owe thanks to 

 the Board of Regents, who have gotten this volume finally 

 published. 



The first part of the volume, published in 1883, contains 

 pages i to xviii, 1 to 268, and Plates I to XL VI. The com- 

 plete work contains 642 pages and 96 plates, and it figures and 

 describes 520 species and 6o genera. It is a magnificent work, 

 placing before the student figures and descriptions of all the 

 known species and varieties of the Devonian Lamellibranchiata 

 of Eastern United States ; it will take its place among the 

 indispensable monographs on the table of the working paleon- 

 tologist. 



The illustration of these Lamellibranchs, as a whole 

 group, was begun in 1869-70, in the issue of a pamphlet, 

 called Preliminary Notice of the fossil Lamellibranchiata, 

 etc., No. 2, 80 pages of which appeared, and a few copies of 

 which were distributed in 1869. The title page of this pamph- 

 let contained no author's name, it was accompanied by no 

 plates. In 1884, Preliminaiy Notice No. 1 appeared in the 

 35th Report of the Regents on the State Museum. 



The final text and plates of the part on Monomyaria appeared 

 in 1883 ; and, finally, the part on the Dimyaria was published 

 in 1885. In the mean time the Report of the State Geologist 

 to the Legislature for 1882 (published in 1884, Assembly Docu- 

 ments 1882, vol. vii, No. 32), announced and published the diag- 

 noses of 20 genera, all of which were new or restrictions of old 

 genera, and, with the text were issued eleven plates of generic 

 illustrations, in the explanation of which 54 genera and 134 

 species are named. Most of the plates of this double volume 

 were completed several years before their publication, or before 

 the text was finished. As early as 1874 sets containing a consid- 

 erable number of the plates, with manuscript names, were sent 

 out to Messrs. S. A. Miller, Dr. J. J. Bigsby, J. Barrande and 

 Henry Nettleroth. (See plates and explanations, 1883, Preface, 

 pp. 1 and 2.) 



Mr. Miller published in his American Paleozoic Fossils, 

 1879, the names of these new species with reference to the 

 forthcoming work, apparently under the advice and supervi- 

 sion of the author. Dr. Bigsby also published in 1878 the 

 names attached to these plates in his Thesaurus Devonico- 

 Carboniferus. Thus a large number of new names became 

 quoted with references to author and plate and figure and 



