34 



uxio. 



SUBEOTUXD. 



*Kienerianus. Lea. 



*vallatiis. Lea. 



*tiirgidus. Lea. Chenu. Han. 

 Unio Mortoni. Con. 



*Cooperianus. Lea. Kirtl. Han. 



*verrucosus. Bar. Sh. & Eat. Chenu. 

 Han. 

 Unio hiberculata? Raf. 

 Unio tuberculosa. Valen. 

 Unio verrucosus purpureus. Hild. 

 Unio tuherculattis. Con. 

 Mya verrucosa. Hat. 



*refulgens. Lea. 



^graniferus. Lea. Chenu. Han. 



'•^jDernodosus. Lea. 



*irroratus. Lea. Sh. & Eat. Desk. 

 Han. Chenu. 

 Unio verrucosus alius. Hild. 

 Unio stegarius. Con. 



*caperatus. Lea. 



Unio abacoides. Halcl. 



"dromas. Lea. Han. 



*Aberti. Con, 



Unio Lamar cldanus. Lea. 



SUBROTUND. 



*graiididens.' Zea. 



OBLIQUE. 



*^sopus. Oreen. Han. 

 Unio cicatricosus. Con. 

 Unio cyphius. Con. 



*varicosus. Lea. Chenu. Han. 

 Unio cicatricosus'? Say} 

 Unio cicatricosus. Con. 



*perplexus. Lea. Kirtl. Chenu. Han. 

 Unio gibbosusf Raf. 

 Unio gibbosus. Con. Kust. (Fig. 3.)* 

 Unio gubernaculum. Reeve. 



*propinquus. Lea. 



OVAL. 



*semigranosus. Phil. 

 Unio explicatus. More. 

 Unio corium. Reeve, 



*Leaii. Gray. Benson.^ 

 Unio nodulosus. Reeve. 



WIDE. 



granosus. Brug. Lam. Chenu. Han, 

 Lridea granosa, Swain. 



*tuberculatus. Bar. Sh. & Eat. 

 Adams. Chenu. Han. 

 Unio pustulata. Swain. 

 Mya tuberculata. Eat. 



Hild. 



^ Never having seen the specimen described by Mr. Say as cicatricosus, I am unable to decide if it be 

 the same with varicosus (nobis). Two things mentioned by Mr. Say induce me to doubt it. He calls his 

 "a common species," and says it is "distinguishable by the single series of transverse elevations on the 

 middle." These remarks do not apply to mricosus, but they do to Ji^sopus, Green. I have always 

 deemed it a rare shell. 



^ Kiister figures (3) a male perplexus (nobis) as gibbosus, Raf. If his fig. 4 be taken from Mr. Con- 

 rad's Monog., pi. 27, fig. 2, it is a sulcatus, Lea. 



' Dr. Cantor, in the Annals of Nat. Hist., vol. 9, p. 489, gives the habitat of this species in Chusan 

 and in Canton River. He also describes a Unio, under the name of divergens, being " tuberculato- 

 plicata;" also, an Anodonta (gibbum), both from Chusan. Mr. Benson, in Journal Asiatic Soc, 1855, 

 says that divergens is distantly related to undulatus. Bar. 



