36 THE NAUTILUS. 



Mr. C. T. Simpson, the well-known author of the " Synopsis of 

 the Naiades," has arranged for the publication of his " Descriptive 

 Catalogue of the Naiades." This is the companion volume to the 

 Synopsis and was prepared immediately after that work appeared, 

 but for various reasons its publication has been delayed until now. 

 It will contain full descriptions of all the species recognized in the 

 "Synopsis" with comparative notes, keys, etc. Descriptions and 

 references to all the species described since the publication of the 

 "Synopsis" have been added, bringing the subject down to date. 

 Unfortunately it is not to be illustrated, but its publication will for 

 the first time place in the hands of the students of the Unionidse 

 adequate descriptions of all the species in one volume. The cost and 

 in many cases the practical impossibility of obtaining the literature 

 necessary for any accurate work in studying this family has been a 

 great drawback to interesting our American collectors in this group, 

 and, in the absence of a fully illustrated manual, this work of Mr. 

 Simpson's will go far towards supplying the long-felt want of such a 

 publication. 



It is expected that the Catalogue will be published early in the 

 fall and will be a volume of from 800 to 1000 pages. It is to be 

 published by Bryant Walker of Detroit, Mich. 



NEW ORLEANS MOLLUSCA The writer with Mr. J. B. Upson, 

 spent the best part of one day the last week of December, 1880, on 

 the shore of Lake Pontchartrain, to the east of Spanish Fort and 

 collected the following species : 



Polygyra espiloca Ravenel, common. 



Polygyra febigeri F6r., abundant. These two species of Polygyra 

 were determined for the writer by Thomas Bland, in a letter dated 

 May 20, 1881. 



Zonitoides arborea Say. 



Zonitoides minuscula Binney. 



Glandina bullata Gould. Mr. Bland said of this form " Glandina 

 truncata, var. (scarcely bullata}" several fine specimens were found 

 and some quite young. 



Rumina decollala L. One dead example. 



Succinea campestris Say, common. 



Planorbis lentus Say, scarce. 



Segmentina havanensis Pfr., common. 



Lymncea techella Hald., few. 



Gnathodon cuneatus Gray, great quantities of dead shells. 



Also young specimens of Viviparus, Campeloma and Sph&rium. 



A. A. HlNKLEY. 



