Occasional Papers of the Museum of Zoology 35 



"L. comprcssa 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. 



Unio viridis Rafinesque, '20, p. 293. 



Unio viridis or subviridis, Conrad, N. Fr. Sh. app. '35, pi. 9, f. I. 



U. viridis Raf., Conrad, '36, p. 35, pi. 17, f. i. 



Unio tappanianus Lea = [/. viridis Con. (not Raf.), Lea, '38, p. 

 62, pi. 17, f. 55. 



Symphynota viridis (Con.), Simpson, '14, p. 484. 



Lasmigona subviridis (Con.) =^ U. viridis Con. (not Raf.) = U. 

 tappanianus Lea, Frierson, '15, p. 57. 



U. viridis RaL ^= Syniph. viridis Con., Vanatta, '15, p. 554 ("type" 

 examined). 



Lasmigona viridi? (Rai.) = subviridis (Con.) = tappaniana (Lea), 

 Walker, '15, p. 74, and '18, p. 177. 



Lasmigona {Platynaias) subviridis (Con.), Ortmann, '19, p. 121. 



"The identification of this species was made by Conrad after 

 he was acquainted with the Poulson Collection which con- 

 tained a valve of U. viridis var. fuscata Raf. This valve, 

 labelled River Kentucky, measures L. 47, H. 28, D. (one valve) 

 8 mm. It differs thus from Rafinesque's dimensions and pro- 

 portions of the type of viridis. The valve is an entirely typical 

 Las. subviridis {tappaniana). 



"The measurements have been considered fully by Walker 

 and by Ortmann. They could apply to L. snbznridis only upon 

 the hypothesis that Rafinesque meant 'largeiiy when he wrote 

 Rongeur.' A specimen of L. subi'iridis i^ 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. 



"It 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 speci- 



