172 ANNALS OF THE CARNEGIE MUSEUM. 
8. Amblema peruviana (Lamarck). 
Given by Price (as Quadrula plicata Say). This is a large-river- 
form, which very well might exist in lower Green River. Walker has 
it (as plicata?) from Green River. Its presence, however, should be 
confirmed. 
*9. Quadrula pustulosa (Lea): Mm; O; R; B. 
Also given by Price as ‘‘very common.’’ It seems to disappear, 
however, toward the headwaters, as is the rule elsewhere. 
10. Quadrula quadrula (Rafinesque). 
Mentioned by Price (as Q. lachrymosa Lea). This should be ex- 
pected in the lower part of Green River. Walker has it from ‘‘Barren 
River, Green Co.,’’ but Barren River is not in this county! 
*11. Quadrula verrucosa (Rafinesque): Mm; 0O; Mf; R; C; D; B;S. 
Given by Price (as Tritigonia (sic!) verrucosa Raf.; U. tuberculatus 
Barnes). Rather abundant. In the lower parts of Green River it is 
represented by a peculiar dwarf race; farther up it is more normal in 
size. 
12. Quadrula metanevra (Rafinesque). 
Given by Price. I have never seen a true metanevra, but only the 
next form. Yet the main species very likely exists in the lower parts 
of Green River. 
*13. Quadrula metanevra wardi (Lea): Mm; O;R. 
Walker has reported metanevra from Rio, but he states that his 
specimens rather are wardi. What I have seen from Mammoth Cave 
and Great Onyx Cave (two specimens) and from Rio (two specimens) 
all unquestionably are wardi, a form turning up toward the headwaters 
wherever found. 
" “14. Quadrula cylindrica (Say): B. 
Also listed by Price. This seems to be rare in the Green River 
drainage. 
