F. H. Bradley—Description of two new Land Snails. 87 
The complete expression for the total heat of combustion of 
fuel in the boiler will be 
E=Q+E 1 
: =Q, +Q, +Q, +Q,4+Q, 
in which Q, represents the heat in the gases after they leave 
the flues represented by « W (t,—2,), and Q, the losses from 
external radiation, incomplete combustion, ete., which can only 
ed. 
* 
be estimat 
Arr. XIV.— Description of two new Land Snails from the Coal- 
measures ; by F. H. BRADLEY. 
of the so-called Zonites. The Pupawas evidently not P. vetusta ; 
and the correction was sent to Prof. Worthen, but was over- 
looked when my report on the county was printed. Upon 
Showing the so-called Zonites, in its cleaned condition, to Mr. 
B. B. Meek, he at once recognized it as congeneric with 
& minute species, Anomphalus rotulus, descri y ee 
and Worthen from Macoupin Co., Illinois (Proc. Phil. Acad., 
1866, p- 268). They refer the genus to the Rotellide: I am 
Tather inclined to refer it to the Helicide. 
append descriptions and figures. 
Pupa Vermilionensis, n. sp., Fig. 1. 
Shell imperforate, spindle-shaped, tapering to an obtu 
®overed with fine ridges (25 or 30 to the millimeter) 
btuse apex, 
pon 
with the lines of growth. Aperture onli ove rarely 
‘olu- 
com- 
projecting about 4". Junc- 
fon of columellar and outer lips sometimes angu- 
lar and slightly dentiform. te old individuals, : 
he columellar tooth is often continuous through an entire turn 
°r farther—not seen on shells having less than three turns. 
