144 THE NAUTILUS. 



nected by intermediate forms with U. cornscus ; and he states that 

 he can as perfectly connect my U. snbluridus with any one of a half 

 dozen Florida species. Not long ago Mr. Wright sent me for 

 inspection the shells he identified as subluridus, and I saw at once 

 that he had made a total mistake aa to the species ; as these specimens 

 loere undoubted U. buckleyi, quite inflated, somewhat keeled, and 

 rather smooth, shining shells, and no more like my species than is 

 U. obesus. Individuals of Unio buckleyi, cornscus, lugubris, hazel- 

 Jmrstianus, and other species of the buckleyi group vary from being 

 absolutely smooth and rayed, a young or adult stage generally to 

 dull colored, and even rough externally, a condition quite common 

 in old specimens. — Chas. T. Simpson. 



Collection of Shells for Sale. — AVe learn that the collection 

 of Rev. A. Dean, numbering about 3500 species, is offered for sale, 

 as Mr. Dean is about to remove from his home at Muncy, Pa. The 

 American land shells are richly represented by a nearly complete 

 series, including almost all of the rarer species. The west African 

 and Sandwich Island forms are also well represented, as well as an 

 unusually large proportion of interesting foreign marine shells. 



We are in receipt of" The Microscopical Bulletin " published by 

 Queen & Co., which contains a Bargain list or Clearance sale of 

 microscopes, objectives, etc. Any one desiring these should send for 

 the February Bulletin to Queen & Co., Chestnut St., Philadelphia. 



Mr. B. B. Woodward has lately published (Ann. Mag. Nat. 

 Hist. Feb., 1893) a classification of the Pelecypoda, in which the 

 families of bivalves as given by Fischer are rearranged in accordance 

 with Pelseneer's scheme founded on the morphology of the gills. 

 The table of families is very useful as it gives the gist of Pelseneer's 

 ideas at a glance. In his review of the various recent classifica- 

 tions Mr. Woodward does not mention that of Dall, being 

 apparently ignorant of it. It is much to be regretted that those 

 who set forth new classifications should not first acquaint them- 

 selves with the work of their predecessors. 



