14 THE NAUTILUS. 
the genus Vitrea Fitz. On the other hand, as well known, our 
Mesomphix (s. str.) are hardly to beseparated generically from Hya- 
linia (Euhyalinia), as glabra, draparnaldi, cellaria, etc., and forms 
like our wheatleyi, petrophila from pura, ete., not to speak of radia- 
tula which is equally distributed on the old and new continents. 
We may, for all these, use the generic name Hyalinia, the more 
since such authorities as W. G. Binney, Tryon and others have done 
so before, and no embarrassing of the synonymy will result. Yetall 
these forms stil] need careful examination as to their anatomy. 
2. Some Zon. suppressus Say, show not a trace of internal teeth or 
rather lamelle, when adult; W.G. Binney (1. c. p. 226) also says 
that the tooth is sometimes “so little prominent as to be hardly 
visible.” I have in possession specimens from Ohio and Virginia 
(Petersburgh, collected by myself)" of 7-8 mill. diam. and 7-74 
whorls, with the last whorl and aperture well-rounded, without any 
“teeth,” and only a thin callus inside. As to size and shape, they 
differ essentially from W. G. Binney’s description and figure.” With 
these, there were examples of all ages and sizes, inseparately con- 
nected with the former, having two strong lamellz upon a heavy 
callus. Also in gularis and other forms of the group, the lamellz 
considerably decrease in size and number with advancing age, and 
at maturity sometimes are quite short and thin. 
3. Mrs. Geo. Andrews, to whom we owe so many valuable finds 
among land mollusca, sent me, in 1891, anumber of “ Zonites gularis 
small var.” Then I was satisfied that they were not gularis; and 
now, after repeated comparison and examination also of the soft 
parts on specimens recently obtained, this is beyond a doubt, and as 
well, that it is a distinct species, not yet described. Here only so 
much of the description will be given as to serve our purpose. The 
shell is of the general appearance of a small Z. ligerus, of only 9 
mill. greater diameter, finely perforated, with a high spire, well- 
rounded at the apex. Inside there is a rather long fold correspond- 
ing to the same (outer) in Z. gularis, etc., and a lower one near the 
columella. In a part of the specimens there is another (outer) long 
fold, about }—} volution above the aperture, sometimes connected 
by a fine marking with the one in front; evidently this is the one 
previously formed and not resorbed, the same thing as in Z. internus, 
etc. 
4. A few examples of Zonites, I) think a form of demissus, from 
? Manual, p. 225; fig. 241, looks like drawn from an immature specimen. 
