120 THE NAUTILUS. 



chapters on the history of Michigan conchology, the relations of the 

 Michigan fauna, on collecting and preserving mollusks, on classi- 

 fication, measurements and descriptive terms. While these subjects 

 are concisely treated, yet Mr. Walker has condensed into his pages 

 the practical results reached by the modern group of American 

 workers in both field and laboratory, so far as applicable to the 

 Michigan fauna. There are few collectors who will not profit by 

 reading the " Hints on collecting mollusca," and "Arrangement of 

 the collection." The classification and nomenclature of the cata- 

 logue are up to date. 



The list comprises 81 species, all described and illustrated by cuts 

 in the text, most of them borrowed from Binney's standard series of 

 figures, though with a considerable number of original drawings. 

 Full references are given to previous Michigan literature, as well as 

 to the original descriptions, and to Mr. Binney's Manual. Excellent 

 keys to the species are given. 



It is no disparagement of other lists to say that the Michigan 

 catalogue as here presented is the most thoroughly worked-up state 

 catalogue we have had. Every species has been the subject of 

 special investigation, as to its characters and identity, and its distri- 

 bution in Michigan. The time and labor involved in working up a 

 state fauna in this thorough manner will be appreciated only by those 

 who have undertaken the rigid verification of every record in the 

 fauna of an equal area. 



A summary of the work on distribution done up to this time is 

 given in the tabular census, giving the distribution of all the species 

 by counties. Records have been received from all but 16 of the 84 

 counties in the state. It will be noted that the comparatively re- 

 mote and inaccessible Upper Peninsula is well represented in the 

 Census, and the Boreal character of its fauna is well shown by the 

 absence of nearly all of the Polygyras, larger Zonitidx, etc. 



Species interesting because of their rarity or on account of notable 

 extensions of their known range, are VHrect wheatleyi and rhoadsi, 

 Pallifera hemphilli, Succinea retusa peoriensis (here for the first time 

 figured), Vertigo morsei, Cochlicopa lubrica morseana, etc. Excel- 

 lent and much-needed original figures of Strobilops labyrinthica, 

 S. virgo and S. affinis are given. 



Mr. Walker is at work upon the fresh-water mollusks, to form the 

 second part of the catalogue. We will all look with interest for his 

 treatment of the aquatic pulmonates. H. A. P. 



