THE FAMILY NAIADES. 



123 



o 



w 



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is 





QUADRATE. 



*lacrymosus.f Lea. 



*asperiimus.:|: Lea. 



Unio quadrulus. Say. 



*fiagosus.§ Con. 



Phillipsii. Con. 



*pustulatus. Lea. 



*Schoolcraftensis. Lea. 

 Unio prasinus. Con. 



TRIANGULAR. 



*apiculatus. Say. 



*asper. Lea. 



*Dorfeuillianus. Lea. 



*stapes. Lea. 



*raetanever. Lea. 



Unio metanevra. Raf. 

 Unio nodosus. Bar. 

 Unio lugosus (Flat). Bar. 

 Unio metanevius. Con. 



D 

 O 



TRIANGULAR. 



*cornulus. Bar. 



Unio reflexa'? Raf. 

 Unio reflexus. Con. 



SUBROTUND. 



*pustulosus. Lea. 



Unio verrucosus. Bar. Var. b. 

 Unio verrucosa. Valen. 

 Unio verrucosus albus. Say; but 

 not of Hildreth.W 



*turgidus. Lea. 



Unio Mortoni. Con. 



*Cooperianus. Lea. 



*verrucosus. Bar. Eat. 

 Unio tuberculala? Raf. 

 Unio tuberculosa. Valen. 

 Unio verrucosus purpureus. Hild. 

 Unio tuberculatus. Con. 



*graniferus. Lea. 



*nodulosus. Lea. 



Mya nodulosa.^ Wood. Dill. 



*irroratus. Lea. Eaton. 



Unio verrucosus albus. Hild. 



inflection on the posterior basal margin. It may be doubted if this should be considered a plicate shell. I con- 

 sider that the folds of the growth, particularly in the male shells, require it to be placed here. 



t It is a matter of some doubt if this be more than a beautiful variety of asperrimus (nobis). Future ob- 

 servation must determine. Ferussac and some other zoologists believe it to be distinct. Dr Ward says they 

 " are certainly distinct." 



f Mr Say supposed this to be the rugosus, Barnes. Two specimens referred to by Mr B. as rugosus were 

 under my inspection, and proved to be — the one a flat metanevra, Rafln., the other a plicatus (Lesueur). Mr 

 B. in his reclamation recognises his rugosus as U. Peruviana, Lam., which sheU is undoubtedly the plicatus, 

 (Lesueur and Say). 



§ This shell has been considered the female of asperrimus (nobis), but I am, after the examination of 

 many specimens, disposed to think it to be distinct. Some of our best western naturalists think it to be the true 

 rugosus of Barnes. 



II A specimen sent to me by Dr Hildreth as Unio verrucosus albus, proved to be a true irroratus (nobis). 



II This shell, as figured by Wood in his " General Conchology," seems to me to be distinct from the pus- 

 tulosus (nobis), with which it h<as been confounded. The figure of Wood is longer than any pustulosus I have 

 seen, and the epidermis is much darker ("bottle green"). The nodules are more numerous about the beaks, and 

 the lateral tooth is longer and thicker. I doubt if the nodulosus be an American species. 



