442 THE AMERICAN MIDLAND NATURALIST 
pium when gravid into blunt, pigmeted beads; mantle edge double 
posteriorly, the inner one antero-ventrad to branchial opening 
developed into a ribboned flap usually produced into a tentacled 
lobe at its end located about the lowest post-ventral point; con- 
glutinate not solid; glochidia rather large, subelliptic. 
"SHELL CHARACTERS -—Shell elliptical to ovate; disk smooth; 
beaks sculptured by the sinuate or double-looped type, sometimes 
with a tendency of the posterior loop to become broken; epidermis 
usually smooth, thin and shiny often brilliantly rayed. Hinge 
with two cardinals and two laterals in left and two cardinals and 
one lateral in the right valve; female shell with an inflation at 
the post-ventral region of shell just over the marsupia. 
MISCELLANEOUS REMARKS:—The differentiation of the mantle 
antero-ventrad to branchial opening into a flap marks this genus 
as among the highest of the Lampsilinae. This flap is so developed 
with tentacles and papillae that it is often extended externally 
and waved to and fro so as to produce almost the best possible 
aération for the embyros. This genus is represented in this State 
by five species which have a good general distribution. 
Lampsilis anodontoides (Lea).' 
(“Yellow Sand Shell,’ ‘‘Lady’s Finger.’’) 
Pl. VIII, Figs. 17 A and B; Pl. XXVIII, Figs. to2 A—D. 
1834— Unio anodontoides Lea, Tr. Am. Phil. Soc., IV, p. 81, ple Vine 
AS) Le 
1834— Unio teres Say, Am. Conch,. VI; 1820, Rafinesque, Monog. 
1898—Lampsilis anodontotdes Baker, Moll Chicago, Pt. I, p. 100, 
jo) yaa erat -aaen de 
ANIMAL CHARACTERS. 
NUTRITIVE STRUCTURES:—Branchial opening rather small 
directed upward; anal crenulated; supra-anal high well separated 
by mantle edges from anal; inner laminae of inner gills connected 
to visceral mass;- palpi long, falcate, connected for one-half of 
their length antero-dorsad; color of soft parts grayish except 
brownish red mantle border at branchial opening. 
‘From Rafinesque’s evident description of this Species in the Suppli- 
ment to his Monograph of 1820 under Unzo teres (Elliptio teres) Lea’s name, 
as given here by Simpson, (1900b, p. 543,) should stand as a synonym for 
Lampsilis teres (Raf.). 
