378 THE CHICAGO ACADEMY OF SCIENCES. 
a trifle tumid; spire acutely conic, a trifle longer than the aperture, 
nuclear whorls smooth, consisting of 14% rounded, horn colored whorls, 
the second being about four times the size of the first (similar to those 
of catascopium) ; sutures impressed; aperture oblong-ovate, narrowed 
at both extremities; outer lip rather thin, regularly convex, bordered 
by a red-edged varix within; inner lip narrow, reflected over and 
rather tightly appressed to the columella, leaving a very small um- 
bilical chink; there is a well-marked columellar plait. The aperture 
is produced anteriorly and the shell is frequently quite imperforate. 
Length. Width. Aperture length. Width. 
13.00 6.50 5.50 3.00 mill. Cotype. 
14.00 7.00 7.50 AL0On as Phil. Acad. 
12.00 6.50 6.50 3.50 “ Coll. Walker. 
14.75 7.00 7.00 Sus) | Bost. Soc. N. H. 
LAS 6.00 6.00 Bal) 9° Ss eS s 
11.50 6.00 6.00 250) on ts * 
15.00 7.50 7.25 4.00 “ re ce i 
Type: Amherst College, Mass.; cotype, one specimen Smith- 
sonian Institution, No. 8490. 
Tyre LocaLtiry: Shoreham (Storeham, misprint), Lake Cham- 
plain, Vermont. 
ANIMAL, JAW, RapuLa and GENITALIA: Unknown. 
Rance: (Figure 44). Vermont to Michigan. A species of the 
Canadian region and of the Transition (Alleghanian) life zone. Future 
researches will doubtless greatly extend this range. 
RECORDS? 
MicuicaAn: Kent Co. (Walker). 
Vermont: Shoreham, Lake Champlain, Addison Co. (Adams; Emmons; 
DeKay; Roper, B. S. N. H.); Lake Champlain (Lea; Walker; Dr. F. B. Wil- 
son); Larrabee Island, Addison Co. (Dr. H. F. Perkins, B. S. N. H.); Higate, 
Lake Champlain, Franklin Co. (Walker). 
GEOLOGICAL DISTRIBUTION: Unknown. 
Ecotocy: Clinging to rocks and stones on the shore of Lake 
Champlain (Adams). 
Remarks: Pallida has been a puzzle to most conchologists, who 
have identified it with desidiosa, obrussa, catascopium and elodes. The 
receipt of a series of shells from the original locality’ together with a 
study of a cotype (now in the Smithsonian Collection) received from 
the author, enables the writer to clear up some of the uncertainty 
2Only those records are here included which are known to have been 
founded on the true pallida. Several of the New York records and a few from 
Canada may eventually prove to have been based on true pallida, Until this 
fact is ascertained beyond a doubt, it seems best to restrict the range to the 
known authentic records. 
ah 1Submitted by Mr. C. W. Johnson, Curator of the Boston Society of Natural 
story. 
