OrRTMANN: NAIADES OF THE GREEN RIVER DRAINAGE. did 
*29. Cyprogenia irrorata (Lea): Mm; O; Mf; R; B. 
Mentioned by Price as ‘‘common,’’ and, where found, mostly 
present in good numbers. Simpson (1914, p. 328) gives C. trrorata 
pusilla Sps. from Green River, and, indeed, the specimens seen by 
me are rather below the average size. But I should hardly think that 
this justifies the creation of a new variety. 
*40. Obovaria retusa (Lamarck): O. 
Not rare at Great Onyx Cave, and typically developed, but not as 
large as in the Ohio River. 
41. Obovaria subrotunda (Rafinesque): R. 
Given by Price (as Ob. circulus Lea). Walker reports this from 
Rio, and has kindly furnished measurements of four of his specimens, 
three of which have the diameter 60 (<), 61 (2), and 73 (c) pr. ct. 
of the length, and they thus belong here. 
42. Obovaria subrotunda lens (Lea): R. 
Price lists this as Ob. lens. One of the specimens, of which Walker 
has given the measurements, a female, belongs here with the diameter 
56) prs (Ct. 
*43. Actinonaias carinata (Barnes): Mm; 0O; Mf; R; G; C; D; B;S. 
Walker reports this from Bowling Green as var. gibba Simpson, and 
Price gives it as Lampsilis ligamentina Lamarck, ‘‘very common,” 
and L. ligamentina var. It is an abundant species, generally the 
prevailing one, and somewhat variable in shape. At the lower stations 
it usually is rather small, but farther upstream it reaches a fair size. 
The majority of the specimens have the typical shape of the “northern 
Muckett,” that is to say, that of the Ohio-form. Yet there are 
individuals, which approach the Cumberlandian variety called gzbba. 
But the same may be occasionally observed in the Ohio River, and 
the ‘‘southern Muckett’’ (var. gibba) cannot be credited to Green 
River. 
*44. Truncilla truncata Rafinesque: O; R. 
Also given by Price as Plagiola elegans Lea. 
