46 



Tate, 1887) = Myodora albida, Ten. -Woods. St. Vincent and 

 Spencer Gulfs ; also Tasmania. 



Mactra rufescens, Lamarck. Correctly identified according 

 to the British Museum record. 



Hemimactra corrugata, Tate, is only a varietal form of 

 If. versicolor, Tate. 



Hemimactra ovalina, Lamarck. Correctly identified apud 

 British Museum, where Mactra depressa, Reeve, non Spengler, is 

 admitted a synonym. 



Lutraria oblonga [Gmelin], Tate, op. cit., XIV., p. 266. If 

 the South Australian shell should be considered separable from 

 the European, bearing the above name, then L. rhynchama, 

 Reeve !, which is identically our shell, should be substituted. 

 L. dissimilis, Deshayes, was not seen. 



Mesodesma glabrella, Lamarck. The types of Amphidesma 

 glabrella, Lk. !, Mesodesma praicisa, Deshayes !, and M. obtusa, 

 Crosse !, have been compared, and found to be conspecific ; the 

 two latter had already been considered by me, op. cit. IX., p. 85, 

 as the same. 



Mesodesma elongata, Desh. This shell occurs in the Paris 

 Museum as a Mactra with an undecipherable specific name. The 

 types of M. elongata and M. angusta, Desh., which are in the 

 British Museum, belong to one species. 



Anapella cuneata, Lamarck sp. Anapa cuneata et A. 

 triquetra. These two species of South Australian Anapas were 

 admitted by me, op. cit., IX., p. 86, but after the study of the 

 types of Lamarck and Hanley, I have come to the conclusion 

 that only one species is represented, which finds support in the 

 fact that the two variants are correlative with their habitats, the 

 typical form on the sea-coast, and the Hanleyan form in estuaries. 

 Crassatella cycladea, Lk., is another synonymn from my examina 

 tion of the type. This species should be quoted under Anapella, 

 Dall, 1895, in substitution for Anapa, Gray, 1853, non Gray, 

 1847. 



Mulinia pinguis, C. and F., after a careful study of the descrip- 

 tion and figures of those authors, I cannot escape from the con- 

 viction that their shell is a monstrosity of Anapella cuneata 

 forma triquetra. The generic location is made clear by the figure 

 which displays the interior of the right valve. 



Donax sordida, Angas ! (non Hanley)=D. Brazieri, Smith !, 

 1872. 



Psammobia zonalis, Lamarck !, id. Tate, op cit., IX., p. 87, is 

 rightly identified. 



Choristodon lapicidum, Chem. Of the two synonymic names 

 Naranio lapicida and N. divaricata, both of Chemnitz, I follow 

 the British Museum authorities in using the former. 



