322 THE AMERICAN MIDLAND NATURALIST 
Cyprogenia Aberti (Conrad.) 
(“Young Fan-Tail.’’) 
¥ Pi DEX VO Pies. 63 Anand )B. 
1850—Unio aberti Conrad, Pr. Ac. Nat. Sci. Phila., V, p. 190; 1854, 
Ji. Ae-Nat, Sci." Philas p. 2955; pl: AAV, ig: 5. 
1885—Unio popenoi Call, Bull, Washb. Col., I, p. 49, pl. II. 
1900b—Cyprogenia aberti (Conrad) Simpson, Proc. U. S. Nat. Mus., 
Peep Ono: 
ANIMAL CHARACTERS. 
NvuTRITIVE STRUCTURES:—Branchial opening with many 
short “papillae; anal with finely crenulated inner edge; supra- 
anal separated from anal by short mantle connection; mantle 
edge antero-ventrad to branchial opening slightly crenulate; 
gills short, wide, inner wider than outer, inner laminae free from 
visceral mass, except for a short distance anteriorly; palpi very 
small, connected about one-half of their distance antero-dorsad; 
color of soft parts dirty white, except for the black, squarish mott- 
lings of the mantle edges around the supra-anal opening. 
REPRODUCTIVE STRUCTURES:—Marsupium formed by five 
to seven ovisacs originating from the edge of the outer gills antero- 
ventrad and extremely elongated posteriorily into a coil; conglu- 
tinates white, very long, solid, club-shaped; glochidia unkown. 
SHELL CHARACTERS. 
EXTERNAL STRUCTURES:—Shell sub-triangular, compressed; 
beaks rather pointed, sculpturing obscure; post umbonal ridge 
prominent with a hummocky expansion middle-ways for the 
female shell, not so sculptured in male; radial furrow rounded 
moderately wide; dorsal ridge faintly ribbed; disk entirely 
rugose; epidermis brownish yellow with numerous banded rays 
marked with mosaics of green mottlings of various patterns of 
geometric designs. 
INTERNAL STRUCTURES:—Cardinals double in each valve; 
laterals double in left, single in right; interdentum long; beak 
cavities deep; nacre bluish, irridescent. 
Sex Length Height Diameter Locality 
Ce tA ogo a TOS (St. Francis R., Greenville) 
OD AG ak 32> SURO (White R., Hollister) 
oe | fe: a ee ee Cae: x 3 
OS) FORT Ke 22. XT (O* + g ) 
