OrTMANN: NAIADES OF THE GREEN RIVER DRAINAGE. iliz/al 
*3. Fusconaia subrotunda kirtlandiana (Lea): R. 
Walker has reported to me that one specimen from Rio had the 
following dimensions: L. 92.5; H. 66; D. 35.5 mm., which would 
make the diameter 38.3 pr. ct. Four additional specimens from Rio, 
examined by myself, have the diameter 45-49 pr. ct. This makes 
these specimens of kirtlandiana to agree with the headwaters-form of 
subrotunda in the Ohio drainage. This form turns up at, or near, the 
upper limit of the range of swbrotunda, and at Rio the two forms pass 
into each other. 
*4. Fusconaia flava (Rafinesque): R. 
Rafinesque (1820, p. 305) cites this from small tributaries of Green 
River; and Price lists it as Quadrula rubiginosa Lea. Walker reports 
it from Rio, and I have seen from the same place a single individual 
with the diameter 45 pr. ct., thus being a typical F. flava, which is 
the form peculiar to smaller rivers and creeks. 
*s. Fusconaia flava trigona (Lea): B;S. 
Also cited by Price (as Quadrula trigona Lea, ‘‘common’’). My 
specimens from Bowling Green, three males, have the diameter of 
56-61 pr. ct., with the beaks not elevated, and thus are typical trigona 
(not wndata Barnes, in which the beaks are elevated). A single 
specimen from Scottsville has the diameter of 55 pr. ct., and thus 
stands just at the lower limit of fv7gona, and close to typical flava. 
*6. Megalonaias gigantea (Barnes): Mm; R. 
Given by Price (as Quadrula heros Say) from ‘Barren Co.,” that 
is to say, well up in Barren River. I found a young dead shell at 
Mammoth Cave, and Clench collected two good specimens of fair 
size at Rio. Generally it is a large-river-form. 
*7. Amblema costata Rafinesque: Mm; O; R; C; D; B;S. 
Walker reports it from the Sulphur Fork of Russell Creek, Adair Co. 
Given by Price (as Quadrula undulata Barnes) as ‘“‘common in all 
streams.’ Very abundant at Scottsville. 
