anodo:n"ta. 



83 



OBOVATE. 



An. exotica.'' Lam. Cuv.' D'Orb. 



Desh. HupL Von Mar. Han. 

 An. giganteiis. Spix. Menke. Kilst. 

 An. pencillatus f Gray. 

 An. Susannse. Gray. 

 An. trapezia. Kust. 

 An. ciconia. Gould. 

 An. Blainvillianus. Reeve. 

 An. subsinuataf Soio. 



*anserina. Spix. Han. '''"■. 



*radiatus. Sjnx. 



Georginse.^ Gray. 

 Leila Georgina. Hupe. 



*'Uruguayensis. Lea. 



crassa. Swain. Han. 



Leotandi. Guppy. 



*arLgulata.* Lea. Hinds. Cooper. Han. 

 Patularia angulata. Chenu. 

 An. feminalis. Gould. 

 An. Randalli. Trask. 



r OBOVATE. 



Gonidea^ Randalli. Con. 

 Gonidea feminalis. Con. 



■^tenetricosa. Lea. D^Orh. Han. 

 Lamproscapha tenehricosa. Chenu. 

 An. tenehrosa. Reeve.^ 



*tenms. Lea. 



*luteola. Lea. 



*miEqiuvalva. Lea. 



AECUATE. 



solidula. Deville and Hupe. 

 *arcuata. Fer. 



arcuta. CailU 



Pallegoixi. Cuming. Reeve. 



sinuosa. Lam. Swain. Han. Dupuy? 



solenidea. Sow. 

 *solemforniis. D^Orh. 



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

 think they are not distinct species. 



'^ 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. 



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

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



* 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. 



* 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 Ifonocondylwa. 



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

 ledge. It is evidently my tenehricosa from South America. 



' 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, Per., from the Nile. 



