TIIE NAUTILUS. 143 



This is apparently a very distinct species and does not appear to 

 be exactly comparable with any Lymncea. It was thought to be L. 

 binneyi, but the shell is very much smaller and thinner, with no um- 

 bilicus and without the acute spire of binneyi. It apparently belongs 

 to the typical group of Lymnaa despite its globose shape, which might 

 place it in Radix, excepting for the lack of the raised and continuous 

 lips of the aperture. It has something of the aspect of a young 

 Bulimnea. 



I take great pleasure in naming this species in honor oi Mr. A. A. 

 Hinkley, of Du Bois, Illinois, in whose collection the shells were 

 found. 



NOTES. 



Note on some Names in the Volutid^e. — A revision in which 

 I have been engaged for some time of the nomenclature and classi- 

 fication of the Volutidse, has shown several errors which have attained 

 a wide currency owing to the failure of authors to attend to the de- 

 tails of early publications on the subject. This has rendered it 

 necessary to give new names to several groups, and to shift some 

 names to groups agreeing with their original types, which had been 

 neglected or lost sight of. Some of the more conspicuous instances 

 are as follows : 



Adelomelon Dall ; new name for the dull-colored group of South 

 American volutes usually called Scaphella, but not the Scaphella of 

 Swainson, 1832. Type, Voluta ancilla Solander. 



Harpulina Dall ; new name for Harpula auct. non Swainson, 

 1832. Type, Voluta arausaica Solander, 1786. 



Maculopeplum Dall ; Type, Voluta junonia, Lamarck. This was 

 originally included with the species of Scaphella by Swainson, whose 

 type was Scaphella undulata Lam., but the American shell belongs 

 to a totally different group from the enamelled species for which 

 Swainson's genus was proposed. Amoria Gray, is probably a syno- 

 nym of Scaphella. 



Volutilithes Swainson, was proposed for the shells to which Fischer 

 later gave the name of Eopsephxa. The type is Voluta rmcricina 

 Lam. The shells typified by Voluta spinosa, and which are usually 

 called Volutilithes, will probably take the name of Plejona Bolten, 

 1798. 



