Occasional Papers of the Museum of Zoology 35 
“L. compressa Lea is not U. viridis Raf.” (H. A. P.) 
LASMIGONA (PLATYNAIAS) SUBVIRIDIS (Conrad), 1835 
Type locality: (viridis Raf.) Ohio and Kentucky rivers and 
small tributaries to them; (subviridis Con.) Schuylkill River; 
Juniata River; creeks in Lancaster County, Pennsylvania. 
Umio viridis Rafinesque, ’20, p. 293. 
Unto viridis or subviridis, Conrad, N. Fr. Sh. app. ’35, pl. 9, f. 1. 
Un vintidis: Rat... Conrad, “36, p. 35, pl. 47, f1- 
Unio tappanianus Lea=U. viridis Con. (not Raf.), Lea, ’38, p. 
G2 up lalate 55s 
Symphynota viridis (Con.), Simpson, ’14, p. 484. 
Lasmigona subviridis (Con.) =U. viridis Con. (not Raf.) =U. 
tappanianus Lea, Frierson, ’15, p. 57. 
U. viridis Rat. =Symph. viridis Con., Vanatta, ’15, p. 554 (“type” 
examined), 
Lasmigona viridis (Raf.) = subviridis (Con.) = tappaniana (Lea), 
Walker, 715, p. 74, and ‘18, p. 177. 
Lasmigona (Platynaias) subviridis (Con.), Ortmann, ’19, p. 12. 
“The identification of this species was made by Conrad after 
he was acquainted with the Poulson Collection which con- 
tained a valve of U. wiridis var. fuscata Raf. This valve, 
labelled River Kentucky, measures L. 47, H. 28, D. (one valve) 
8mm. It differs thus from Rafinesque’s dimensions and pro- 
portions of the type of wiridis. The valve is an entirely typical 
Las. subviridis (tappanana), 
“The measurements have been considered fully by Walker 
and by Ortmann. They could apply to L. subviridis only upon 
the hypothesis that Rafinesque meant ‘largeur when he wrote 
‘longeur. A specimen of L. subviridis 1% inches long ‘at 
most’ would be small for the species, and those of this length 
I have measured are invariably more compressed than Rafin- 
esque’s ratios call for. 
“Tt seems inadvisable to replace a well-defined name accom- 
panied by a figure by one which obliges us to correct the 
author’s statement of size, to suppose that he measured a spect 
