404 THE CHICAGO ACADEMY OF SCIENCES. 
rather wide, thick callus; inner lip narrow, reflected, nearly or quite 
closing the umbilicus; the columella is inclined to be twisted and is 
marked by a heavy plait. Some specimens are somewhat malleated. 
Length. Breadth. Aperture length. Breadth. 
23.50 9.50 11.50 4.80 mill. Cotype. 
22.00 10.00 11.50 il Ones 8 
29.00 12.50 ae. Chee. we) (Nein 
15.50 7.50 7.60 Saeki 2 Utah. 
17.00 8.00 8.50 AO. ss 
Types: British Museum, London, England. 
Tyre Locatity: Sumass Prairie, Frazer River, British Colum- 
bia. 
ANIMAL, JAW, RApULA and GENITALIA: Unknown. 
Rance: British Columbia south to Northern Utah (41st parallel) ; 
a species of the Columbian and Great Basin regions and of the Canad- 
ian and Transition life zones. Sumassi doubtless occupies much of 
the territory between the two records cited, but it has been confused 
with palustris, jacksonensis and other western species and the records 
cannot be relied upon. Only two lots have been seen which are authen- 
tic, the type lot and one from Echo Canyon, Utah. 
RECORDS. 
Unitep STATES. 
Urau: Echo Canyon, Summit Co. (Hannibal). 
BriTisH AMERICA. 
BritisH CoLUMBIA: Sumass Prairie, Frazer River, New Westminster Dis- 
trict (Baird; Lord). 
GEOLOGICAL DistrrpuTION: Unknown. 
Ecotocy: Not recorded. . 
REMARKS: Sumassi has long been a puzzle to most American 
conchologists who have believed it to be a snyonym of palustris. The 
original description is quite inadequate and in no wise differentiates the 
species from palustris. Dr. Dall recently’ quoted it as a variety of 
catascopium, while the writer® referred certain fragile Lymnzas from 
Lake George, near Florissant, Colorado, to it. Through the kindness 
of Mr. E. A. Smith, of the British Museum, the writer was enabled 
to examine and figure two specimens of suwmassi from the original lot 
collected by Mr. J. K. Lord. These specimens are quite different from 
the Colorado specimens (which are a form of palustris) and show that 
Dr. Dall was right in associating swmassi with catascopium. 
Sumassi closely resembles certain narrow forms of catascopium, 
especially examples from the Great Lake region, but it is usually nar- 
1Alaska Moll., p. 78. 
*Henderson, Moll. of Colorado, p. 180. 
