ORTMANN: NAIADES OF THE GREEN RIVER DRAINAGE. 173 
*15. Cyclonaias tuberculata (Rafinesque): Mm; O; R; C; B; S. 
Given by Price (as Quadrula verrucosa Barnes). Rather abundant 
in Green River. At Bowling Green I only saw a dead specimen. 
Specimens from Mammoth Cave have also been received from Mr. 
B. S. Sanford of Hudson, O., collected in September, 1925. In those 
examined, the obesity varies from 51 to 57 pr. ct. 
*16. Cyclonaias tuberculata granifera (Lea): O. 
It is doubtful, whether ‘“ Unio grandiferus Lea’’ of Price, given as 
” 
“rather common,”’ refers to this species, since it has been placed with 
‘Unio,’ and not with “Quadrula.”’ Simpson (1914, p. 906) gives 
“Quadrula granifera pusilla Sps.” from Green River. My only speci- 
men, a female, would agree with this, but it is exactly like a normal 
granifera (diameter 65 pr. ct.), but smaller: the other characters 
given by Simpson do not hold good. 
17. Plethobasus cooperianus (Lea). 
This species mentioned by Price (as Quadrula cooperiana) might be 
expected here, but recent investigations have not brought it to light. 
18. Plethobasus cyphyus (Rafinesque). 
This species is aiso listed by Price (as Quadrula e@sopus Green): it 
should certainly be expected to occur here, but it has not been found 
in recent times. 
*19. Pleurobema cordatum (Rafinesque): Mm; O; R; B. 
Given by Price (as Quadrula obliqua Lamarck). It is rather 
abundant, but disappears upstream. 
*20. Pleurobema cordatum plenum (Lea): O. 
Rare, and not very typical. 
*21. Pleurobema cordatum catillus (Conrad): Mm; O; R; B; S. 
Also in Walker collection from Mammoth Cave, and mentioned by 
Price (as Quadrula solida Lea). Rather abundant. The diameter of 
