38 THE NAUTILUS. 
slightly exceeding one-third the length of shell, ovate, the outer lip 
strongly arcuate above, columellar margin flattened above; per- 
istome continuous, the adnate parietal portion longer than in P. 
lapidaria. Alt. 6, diam. 3} mm. 
Black Falls, above Florence, Alabama (A. A. Hinkley, 1894). 
The species is somewhat intermediate between P. /apidaria and P. 
cincinnatiensis, but more like the former, from which, however, it is 
very easily distinguished on comparison. The form is stouter, the 
aperture larger, the outer lip more strongly curved above, and the 
color duskier. The apex is somewhat eroded in all of the well 
grown specimens. The dentition is similar in general characters to 
that of P. lapidaria. 
I am indebted to Mr. Bryant Walker for the specimens, which 
were collected by Mr. Hinkley. Upon inquiry, my correspondent 
quotes as follows from Mr. Hinkley’sletter: “ Most of the distance 
from Florence to the last lock of the canal there is a steep rocky 
bank ; a few rods from the water of the river over this bank anid out 
of it are several small streams and springs of clear water. The 
species under consideration was seen at most of these small streams 
but was not numerous except at the two falls from which they were 
taken. Three forms of Goniobasis were taken from the same streams- 
Now, while the Goniobasis were in the water, the others were not. 
They were taken from moss and decaying vegetation but were kept 
damp by the spray of the falls or by the dripping water under the 
rock back of the falls and the saturated moss. As I made a hurried 
trip the day I collected these shells, they were not examined closely, 
but I took it for granted they were feeding in the decaying vegeta- 
tion. None of them were found beyond the reach of the spray but. 
still they might have been hidden under the rubbish.” 
From this the new species appears, as Mr. Walker remarks, to be 
clearly Pomatiopsine in habits. In choosing a specific term for the’ 
form, I have acted upon the suggestion of Mr. Walker that the name 
of one of our best collectors be associated with this interesting 
species. 
THE WEIGHT AND SIZE OF SHELLS. 
BY REV. HENRY W. WINKLEY. 
With the assistance of Mr. D. E. Owen, teacher of Physics in 
Thornton Academy, the writer has weighed a few species of minute 
shells. The results are given as follows: 
