THE NAUTILUS. 93 



tudinally obsoletely striate on the left side, obscurely obsoletely 

 punctate near the anterior edge, and covered with a very thin peri- 

 ostracum which reflects nacreous tinges of color. The shell itself is 

 white and thin, with a small spiral nucleus ; the left margin some- 

 what recurved, the central part moderately convex ; the whole ex- 

 tends more than half the length of the body and measures 12 by 

 (5.5 mm. 



This species differs from P. digueti Rochebrune in color, in the 

 proportional size and number of pinnules of the gill, in having a 

 larger and differently shaped shell, and in the position of the anal 

 orifice. These remarks apply to the form described by Pilsbry 

 anatomically; Rochebrune states that his species was scarlet above 

 and whitish below, but gives no anatomical data. 



GENERAL NOTES. 



Dr. Jousseaume publishes a monograph of the Clausilioid group 

 Nenia in the current number of the Bull. Soc. Philomathique de 

 Paris (1900). Among other novelties introduced in the same paper 

 is a supposed new genus Bonnaniits, which seems to be the same as 

 Passamaella, a curious Buliminoid group of Socotra. 



MOLLUSKS IN GRASS Mr. Virginius H. Chase recently sent me 



from Valley township, Stark Co., Illinois, a piece of sod thickly cov- 

 ered with growing grass, and which was fairly alive with living pul- 

 moriates. The piece of sod was eight by four inches in size, and 

 from it I picked the following specimens and species : 



1. Polygyra monodon Rackett. ' 



2. Pyramidula strlateUa Anthony. 

 136. Bifidaria armifera Say. 



5. Bifidaria contracta Say. 



1. Bifidaria pentodon Say. 



The locality from which the sample came was a moist prairie. 

 If this number was collected in u piece of ground less than a foot 

 square, what must the whole prairie have contained ! FRANK C. 

 BAKER. 



In the early seventies Prof. Verrill dredged a minute bivalve off 

 New Haven and gave the name Gastranella tumida Verrill to it. 

 Since then it has been unknown until some of my minute materials 



