42 THE NAUTILUS. 



is the true /. oniscus. The main difference in sculpture is that in 7. 

 oniscus the lateral areas are longitudinally striolate, and the median 

 areas more elevated than in /. Elizabeth ensis ; further, the girdle 

 scales in the former species are minutely striated, while in the latter 

 they are smooth. The coloration in /. oniscus is very variable; it 

 may be pure white ; white stained with brown ; lilac with or with- 

 out brown, yellow, or green markings ; green or yellow with black- 

 ish dots ; indeed the variations are Protean. The girdle coloring 

 is in general co-related to the colors of the shell and is usually 

 marked in a somewhat similar pattern. One specimen measures in 

 length 16 mill, and 7 mill, in breadth. Geographically, I. oniscus 

 appears to be confined to Natal, and /. Elizabethensis to Cape 

 Colony. 



NOTES ON NEW AND LITTLE-KNOWN AMNICOLIDJE. 



BY HENRY A. PILSBRY. 



Lyogyrus granum (Say). 



This species has long been known as an Amnicola. It was origin- 

 ally described as Paludina grana by Thomas Say, from the "fish 

 ponds at Harrowgate," now within the city of Philadelphia. Say 

 did not describe the operculum. Haldeman merely quotes Say's 

 description in his monograph. Binney does the same in L. and Fr.- 

 W. Sh. N. A. Ill, p. 86, but he gives a figure of a type, which is 

 still preserved in the Philadelphia collection. 



Tryon and Gabb both collected specimens within the city limits, 

 and later it has been found in various localities in Pennsylvania and 

 New Jersey. The following lots are now in the collection of the 

 Academy : Philadelphia (Say, Tryon) ; Fairmount [Park] (Gabb) ; 

 Macerating tub at A. N. S., fed from city water main (McCadden) ; 

 Paradise, Lancaster Co., Pa. (Witrner Stone) ; near Kaighn's Point, 

 N. J. (M. Schick) ; Paulinskill, Hainesburgh, and Cedar Lake, 

 Warren Co., N. J. (Pilsbry). 



Numerous specimens identified by various conchologists as "A. 

 grana," from Canada, Ohio, Illinois, Missouri, etc., prove to be other 

 species upon close examination ; and so far as present information 

 goes, Say's species extends from Lancaster Co., and Philadelphia, 

 Pa., and Camden, N. J., northward to the ponds and lakes of north- 



