THE NAUTILUS. 91 



which has been used by Simpson for a section of Unio, will be appro- 

 priate, and its use will conform to the rules of nomenclature. The 

 type species of Elliptio is U. crassidens Lamarck. Congeneric are 

 at least the following species: gibbosus Barnes, complanatus Dillwyn, 

 fisherianus Lea and productus Conrad, and probably most of the 

 other North American species, at least those which group with the 

 species named. 



II. The substitution of Anodontites Bruguiere, 1792, for Anodonta 

 Lamarck, 1799, has also been advocated by Thiele (1. c.), and is not 

 objected to by Haas (1. c.). 



I think this case is absolutely clear, and there is no earthly reason 

 for this change. Anodontites was created by Bruguiere in order to 

 describe a new species, A. crispata, from South America. He also 

 says that several other species belong to Anodontites, two of Linnaeus, 

 which he names, and seven others which he does not mention. This 

 leaves not the slightest doubt that Anodontites crispata is the type 

 of Anodontites. It is the first species described under this generic 

 name, and it consequently always has to remain with this genus un- 

 less the latter is dropped for other reasons. In Simpson's synopsis, 

 however, this species stands under Glabaris Gray, 1847. This is 

 against the rules. Since there is no objection whatever to the gene- 

 ric name Anodontites, Anodontites crispata has to stand, and all other 

 species of the modern Glabaris have to go with it, so that Glabaris 

 becomes a synonym of Anodontites, which is a South American genus. 

 This opens the way for the admission of Lamarck's Anodonta, the 

 type of which is, according to Simpson, Mytilus cygneus of Linnceus. 



We may now rejoice, for we have three valid generic names 

 among the Najades which we must not confuse, Anodontites Bru- 

 guiere (= Glabaris Gray), Anodonta Lamarck and Anodontoides 

 Simpson, disregarding the synonyms Anodon Oken, Anodontes Cu- 

 vier, Anodontopsis Simpson and the fossil Anodontopsis McCoy. 



THE LAND SHELLS OF GARDEN KEY, DRY TORTUGAS, FLA 



BY GEORGE H. CLAPP. 



While at Key West last June on the " Eolis," Henderson and I 

 were invited by Dr. Alfred G. Mayer, in charge of the Carnegie 

 Institution Biological Station on Loggerhead Key, Dry Tortugas, to 



