THE NAUTILUS. 



51 



valve, and extending quite up to the cardinals by a line thread-like 

 elevation; dorsal plate entirely wanting; nacre silvery white, tinged 

 with pink towards the beaks and more or less spotted with thin layers 

 of vitreous-like matter; pallial line hardly discernible. Width 21 

 length l T 3 g, diameter f inches. 



Habitat : Suwannee River, Florida. 



Type in National Museum. 



Remarks: Affinity, U. Jamellatus Lea. A large series of this 

 shell lias been in hand for two years and for a time it was doubtfully 

 referred to U. mbinflatus Con. Mr. Simpson compared them with 

 authentic specimens of that species in the National Museum without 

 being impressed with their likeness, but said they seemed nearer to 

 that°species than to any other. A comparison of the teeth with that 

 of the Indian species, given as its affinity, leads to the conclusion 

 that they should group together. The cardinals are shorter and 

 more robust, but have the same direction and sculpture. At first 

 glance the shell reminds one of U. camptodon, Say, but the radical 

 differences in the beak sculpture and teeth clearly distinguish it from 



members of that group. 



To be Continued. 



PLANORBIS RUBELLUS STERKI, AND P. HARNI PILSBRY. 

 BY H. A. PILSBRY. 



In this Journal for April, 1891, Mr. E. H. Ham gave a list of the 

 shells found in western Pennsylvania, chiefly around his home in 

 Blairsville. A few of the species had been submitted to me for de- 

 termination, among them a Planorbis of the cxacutus group, which I 

 consider a new species, or possibly a new variety of exacutus. This 

 was entered in the list as " Planorbis (? var.) Harni Pilsbry." 

 (Nautilus IV, p. 137.) I intended at the time to describe the 

 species; but other matters crowded it out of mind, and the name 

 remains a nude one to this day. 



Mr. E. G. Vanatta has recently called my attention to the specific 

 identity of my types of P. Harni with a form received from Dr. 

 V. Sterki as " P. exacutus var. rubellus." This variety was described 

 by Dr. Sterki on page 7 of a privately printed brochure entitled « The 

 Land and Fresh Water Mollusks in the vicinity of New Philadel- 

 phia," (Beobachter Press, New Philadelphia, Ohio, 181)4). 



