392 THE CHICAGO ACADEMY OF SCIENCES. 
Length. Breadth. Aperture length. Breadth. 
15.00 8.00 9.00 3.75 mill. Type. 
11.50 6.00 5.50 225) a “4 
14.00 7.00 8.50 Syale Squaw Island. 
11.00 6.00 6.50 BOI, Po a 
13.00 7.00 8.00 Br 3 ne 
13.50 7.00 7.50 SO) 7 7 ¢ 
Types: Three specimens, Smithsonian Institution, No. 118664. 
Tyre Locatity: Niagara River, Lewiston, New York. 
ANIMAL, JAW, RApuLA and GENITALIA: Not examined. 
Rance: New York and Ontario. Fusiformis appears to be a 
characteristic race of the Great Lakes, no specimens having been seen 
from any locality outside of this drainage. It is, therefore, confined 
to the Canadian region. 
RECORDS. 
UNITED STATES. 
New York: Squaw Island, Niagara River, Erie Co. (Letson; Nason; 
Miss Walker) ; Lewiston, Niagara Co. (Lea; Nicklin) ; rapids above the Ameri- 
can Falls, Niagara (Miss Walker). 
BriTIsH AMERICA. 
OnTario: Ottawa, Carleton District (Hinkley). 
GEOLOGICAL RANGE: Unknown. 
EcoLtocy: Not recorded. Evidently modified by the influence of 
rapid flowing or rough water. 
Remarks: Niagarenis differs from catascopium in its smaller 
size, generally more solid shell, more fusiform shape, less impressed 
sutures and hence more flat-sided whorls (especially the body whorl) 
and in its more elongated aperture; the columellar callus is heavier in 
adult specimens, but the columellar plait is much less conspicuous. 
This is a neat little shell, usually quite distinguishable from typical 
catascopium. Binney (p. 50) places fusiformis in the synonymy of 
desidiosa (obrussa) but in this he was in error, a fact made clear by an 
examination of Lea’s types, which have the heavy spiral sculpture of 
catascopium. The umbilical chink is not always tightly closed, the im- 
mature shell frequently showing quite a chink. In the type lot, two 
specimens, immature, show a small umbilical chink, while one specimen, 
adult, is quite imperforate. The specimens from Squaw Island, illus- 
trated on plate XLII, are:the same as the type specimens and well il- 
lustrate the form of the race. Specimens from Niagara Falls are 
the same as are also certain very immature shells from Ottawa, Canada. 
Certain narrow forms of catascopium from Pine Lake, Charlevoix Co., 
Michigan, somewhat resembles miagarensis, but the whorls are rounder, 
the sutures deeper and the aperture is much rounder. Nuiagarenis 
