712 UNIO 
Unio jewetin Lea, Pr. Ac. N. Sci. Phila., XI, 1867, p. 81; Jl. 
Ac. N. Sci. Phila., VI, 1868, p. 276, pl. xxxvu, fig. 89; Obs., 
XII, 1869, p. 36, pl. xxxvn, fig. 89. 
Margaron (Unico) jewettti Lea, Syn., 1870, p. 51. 
Unio pawensis Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 161; 
Jl. Ac. .N..Sei. Phila, Vl; 1808, p..302, pla xy, ie. tia Obs. 
AT, 1860; p62. pl. xa hee 114i 
Margaron (Unio) pawensis LEA, Syn., 1870, p. 51. 
A very variable species in size, color and form. Some of 
the material from South Carolina and Georgia has rather a 
thin reddish-tinted epidermis. Occasional shells are nearly 
evenly elliptical, being only slightly rhomboid, from these 
there 1s every variation to material that is incurved on the 
base, decidedly rhomboid and having the posterior point drawn 
down to a beak. This latter character is the result of maturity 
or old age and is seen in many other unrelated Uniones. 
It may be that the Unio carolinensis of Bose is the same as 
Lea’s U. obesus. Dr. Lea thinks it is Margaritana margariti- 
fera, but Bosc did not visit any region inhabited by that species, 
and the figure seems to show lateral teeth. I confess that I 
am not able to determine what species Bosc refers to and I 
think it is better to use the name given by Lea. 
The figure given by Conrad for U. diclivis seems to me to 
be that of a typical obesus and not that of any form of tetralas- 
mus. 
The type locality was originally given as York River, Va., 
but Lea (Obs., I, p. 118) states that this was a mistake and that 
the types were collected by Le Conte in Georgia.. 
Var. blandingianus Lea. 
Shell dark and rough, often cloth-like, rhomboid, frequently 
drawn out to a beak at the hinder end. This beak sometimes 
extends below the rest of the base line. 
Florida; extending northward into southern Georgia. 
Type locality, St. John’s River, Fla. 
