uxio. 



g 



^. 







SUBROTCXD. 



*Kienerianus. 



vallatus. 



*turgidus. Lea. Chenu. Han. 

 Unio Mortoni. Con, 



*Cooperianus. Lea. Kirll. Han. 



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



Han. 



Unio hiberculata? Raf. 

 Unio tuberculosa. Valen. 

 Unio verrucosus purpureus. Hild. 

 Unio tuberculatus. Con. 

 Mya verrucosa. Eat. 



*refulgens. Lea. 



*graniferus. Lea. Chenu. Han. 



*pernodosus. Lea. 



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



Han. Chenu. 



Unio verrucosus albus. Hild. 

 Unio ste/jarius. Con. 



*caperatus. Lea. 



Unio abacoides. Hold. 



*dromas. Lea. Han. 



*Aberti. Con. 



Unio LamarcTcianus. Lea. 



SUBROTUXD. 



*grandidens. Lea. 



OBLIQUE. 



*JEsopus. Green. Han. 

 Unio cicatricosus. Con. 

 Unio cyphius. Con. 



*varicosus. Lea. Chenu. 

 Unio cicatricosus? Say. 1 

 Unio cicatricosus. Con. 



Han. 



*perplexus. Lea. Kirtl. Chenu. Han. 

 Unio gibbosusf Raf. 

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

 Unio gubernaculum. Reeve. 



*propinquus. Lea. 



OVAL. 



*semigranosus. Phil. 

 Unio explicatus. More. 

 Unio coriutn. Reeve. 



*Leaii. - Gray. Benson? 

 Unio nodulosus. Reeve. 



WIDE. 



granosus. Brug. Lam. Chenu. 

 Iridea granosa. Swain. 



Han. 



*tuberculatus. Bar. Sh. & Eat. Hild. 



Adams. Chenu. Han. 

 Unio pustulata. Swain. 

 Mya tuberculata. Eat. 



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

 the same with varicosus (uobis). 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 varicosus, but they do to jEsopus, 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. 2T, 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 diuergens, being "tuberculato- 

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

 says that divergens is distantly related to undulalus, Bar. 



