TRANSACTIONS OF WAGNER 

 1158 



TERTIARY FAUNA OF FLORIDA 



ing respectively short orbicular species and elongate species, and in 1833, and 

 subsequently, Brown cited Kellia suborbicularis as an example of the former, 

 making this section an exact synonym of Kellia, as all Brown's orbicular 

 Tellimyas were varieties of this species. All the original species of the second 

 section are referable to the prior genus Montacuta, the first one of the list 

 being M. ferruginosa. T. bidentata was not included with them until 1844, 

 so that the name Tellimya must be dropped absolutely into synonymy. 



The next name which might be applied to this group is Sphenalia S. Wood, 

 which was given to a very peculiar little Pliocene and recent shell which may 

 prove to be possessed of generic rank when the soft parts come to be known. 



Jeffreys, however, was in error in supposing that there is no internal 

 resilium. It is present as in Rochefortia, and I am unable to make out on his 

 unique recent specimens any evidence of an external ligament. In the uncer- 

 tainty as to anatomical characters and in view of the peculiarity of the shell 

 it seems best not to extend the scope of Sphenalia so as to make it cover species 

 like T. bidentata. 



In 1877 Angas described and figured badly two small Australian shells 

 which he called Mysella. The types were presented to the British Museum 

 and reported on by Mr. Edgar A. Smith (Ann. Mag. Nat. Hist, for Sept., 

 1891, p. 235), who found no characters differentiating them from the group 

 then called Tellimya as represented by T. bidentata. I owe to the ever-ready 

 courtesy of Mr. Smith a careful drawing of the hinge of Angas's type Mysella 

 anomala. and entirely agree with his determination of its generic relations. 

 I have also been able to study specimens of Angas's second species, M. donaci- 

 f or mis, which possesses the same type of hinge. As I have already shown, 

 the name Tellimya not being available, Mysella might be used for the group, 

 and in my synopsis of the recent and Tertiary Leptonacea of North America 

 and the West Indies, above cited, I adopted it. There is, however, a name 

 still prior to Mysella, but which from the figures and descriptions given by its 

 author seemed to differ too much to be safely united with it in the absence 

 of specimens. This is Rochefortia Velain (1876). Since the publication of 

 my synopsis I have received a copy of a paper by the late F. Bernard on the 

 lamellibranchs of St. Paul Island, in which he gives excellent figures of Roche- 

 fortia from the type specimens. He points out that it is identical with the 

 so-called Tellimya* a conclusion which I heartily accept. 



* Identified in Bernard's paper as Montacuta bidentata. 



