448 THE AMERICAN MIDLAND NATURALIST 
‘sculpture faint consisting of fine broad, inverted V-shaped lines with 
the apices pointing toward tips of beaks; epidermis yellowish 
or olivaceous with widely separated and interrupted rays. 
INTERNAL STRUCTURES:—Cardinals double in left; single in 
right; laterals doubled the same; nacre white. 
Sex Length Height Diameter Locality 
9 110 x 65 x 48mm—(Flat Creek, Sedalia) 
Guage 68 48mm—( ”’ oy ee) 
x xX 
@ 8 x 46 x 30mm—(Black R., Williamsville) 
o 54 xX 30 x 17mm—(White R., Hollister) 
MISCELLANEOUS REMARKS:—Although L. /uteola is considered 
as having the greatest geographical distribution over all United 
States yet (strange to say!) it has limited distribution in Missouri. 
It is not found at all in North Missouri, occurs very sparingly for 
Central Missouri, (especially in the Osage basin) and is not at all 
typical for South Missouri. The best types are found in Crow’s 
Fork, Fulton, and in Flat Creek, Sedalia, where the female shells 
attain enormous size and thickness—the typical ‘Fat Mucket,”’ 
as it is known on the market. Surber finds that the glochidia of 
luteola attain a larger size in the fluviatile forms (1912, p. 4) and 
thinks that the larger size of the river form may be correlated with 
the larva. Luteola is bradytictic. 
Lampsilis luteola rosacea (DeKay). 
(“Rosy Mucket.’’) 
Pl OK Vale aes: TOA and ae 
1843— Unio rosaceus DeKay, Zool. of New York, V., p. 192, pl. XXXIV, 
figs. 355 and 356. 
1g00b—Lampsilis luteolus rosaceus (DeKay) Simpson, Pr. U. S. Nat. 
Miss; exc ps 535% 
ANIMAL CHARACTERS:—No soft parts have been seen but in 
all probability identical with those of the parent. 
SHELL CHARACTERS :—Identical in all respects with the parent 
species except in its solid pink nacre. 
Sex Length Height Diameter Locality 
co 125 xX 72 x 49mm—(White R., Hollister) 
9 90 x 52 x. 37mm—(Black R., Williamsville) 
MISCELLANEOUS REMARKS:—A cotype from a lot of pink- 
nacred shells collected by the writer in the White and Black 
