ANODOXTA. 



83 



Si 



g 



OBOVATE. 



.4n. exotica* Lam. Cuv? D'Orl. 



Desk. Hupe. Von Mar. Han. 

 An. giganteus. Spix. Menlce. Kust. 

 An. pencillatus? Gray. 

 An. Susannse. Gray. 

 An. trapezia. Kust. 

 An. ciconia. Gould. 

 An. Blainvillianus. Reeve. 

 An. subsinuata? Sow. 



*anserina. Spix. Han. 

 *radiatus. Spix. 



Georginse. 3 Gray. 

 Leila Georgina. Hupe. 



*Uruguayensis. Lea. 

 crassa. Swain. Han. 

 Leotandi. Guppy. 



*angulata. 4 Lea. Hinds. Cooper. Han. 

 Patularia angulata. Chenu. 

 An. feminalis. Gould. 

 An. Randalli. TrasJc. 



OBOVATE. 



Gonidea* Randalli. Con. 

 Gonidea feminalis. Con. 



*tenebricosa. Lea. D'Orb. Han. 

 Lamproscapha tenebricosa. Chenu. 

 An. tenebrosa. Reeve.* 



*tennis. Lea. 

 *luteola. Lea. 

 *insequivalva. Lea. 



ARCUATE. 



solidula. Deville and Hupe. 



*arcuata. Fer. 



arcuta. Caill? 



Pallegoixi. Owning. Reeve. 



sinuosa. Lam. Swain. Han. Dupuy? 



solenidea. Sow. 

 *soleniformis. D'Orb. 



1 So far as I have been enabled to examine specimens of this and trapezialis, I am disposed to 

 think they are not distinct species. 



1 The figure, PI. 90, given in the edition of Cuvier by his pupils, is said to be reduced to one-half. 

 It seems to me to be a good representation of An. lato-marginata (nobis), and not like Lamarck's exotica. 



3 I have not seen this shell. It seems to be nearly allied to Blainmlliana (nobis), judging from the 

 figure in Griffith's Cuvier, PI. 19, Fig. 3. It is from Paraguay. 



4 This very curious and interesting species was described from a single imperfect valve, brought by 

 Mr. Nuttall from Oregon. Some years afterwards, Lady Catherine Douglas recognized it among the 

 shells sent by Sir George Simpson, from Vancouver, and to her I owe the possession of a fine and perfect 

 specimen. In the collection of the Exploring Expedition, I recognized many fine specimens which 

 Captain Wilkes brought from Columbia River. Some of them my friend Dr. Gould has since character- 

 ized as a distinct species, but in this I should not agree with him. Mr. Hinds found this species abund- 

 ant in the Rio Sacramento, California, where he says it was used as food by the Indians. 



6 I do not see any reason for proposing a new genus for this shell. If the irregular dorsal margin 

 required its being removed from Anodonta, then it should be placed in D'Orbigny's genus Monocondylcea. 



6 Mr. Reeve quotes Say for tenebrosa, but Mr. Say described no Anodonta by that name to my know- 

 ledge. It is evidently my tenebricosa from South America. 



7 The figure of Cailliaud, Voy. a Meroe, vol. ii., PI. 61, is exactly like a specimen sent to me many 

 years since under the name of arcuata, Fer., from the Nile. 



