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394 THE CHICAGO ACADEMY OF SCIENCES. 
“Upper Mississippi drainage; south to the Cumberland 
and Arkansas rivers; Red River of the North.” 
“This species has generally been confounded with its near 
ally, Lampsilis anodontoides Lea. It is a smaller, more inflated, 
and in every way a more delicate form than the latter, is not so 
high, the epidermis is brighter and more glossy, and generally 
rayed. The postbasal inflation of the female is usually more 
pronounced, and the posterior point is higher than in anodon- 
toides. The latter is usually more yellow or tawny than /edlla- 
closus, and is, on the whole, a heavier shell.” 
‘In ZL. fallaciosus there is a horny, brown, raised streak on 
the inside of the mantle behind, that I do not find in anodon- 
toides, and the palpi of the former are shorter.’ (Simpson.) 
It is confined to the western region, and has been collected 
only in Hickory Creek, near Joliet. 
p. 106. Lampsilis spatulatus Lea should be called Lampstls 
ellipsiformis Conrad (Uno ellipsiformis CONRAD, Monograph, 
Vol. VIII, p. 60, pl. xxxiv, fig. 1, 1836). 
p. 109. Lampsilis parvus Barnes. This species has been 
found in the Little Calumet River and is abundant in a creek 
near Blue Island. Mr. Jensen has given the following measure- 
ments of a specimen in his collection: length, 41.00; height, 24; 
breadth, 19.50 mill. 
p. 113. Species No. 37 should be changed as follows: 
37- Sphzerium vermontanum Prime, pl. xxvii, fig. 4. 
Spherium vermontanum PRIME, Proc. Phil. Acad., p. 128, 1861. 
Shell: The description on pages 113 and 114 holds good. 
The following additional measurements have been made: 
Length, 12.00; height, 10.00; breadth, 7.00 mill. (Lyon coll.) 
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Animal: Not observed. 
Distribution: Lakes Champlain and Memphremagog, Ver- 
mont (Prime); Shoreham, Vt.,and Holland, Mich. (E. W-Roper, 
in letter); Michigan (Bryant Walker, after De Camp); Lake 
Michigan, at Miller’s, Ind., and Chicago, Ill. (Dr. H. N. Lyon); 
Hickory Creek (J. H. Ferriss). 
Geological distribution: Pleistocene. 
Habitat: Found generally in the larger lakes. 
Remarks: This species was at first identified as solidulum 
Prime, but specimens submitted to Mr. E. W. Roper, a short 
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