384 LUTRARIINjE. 



the Mediterranean, and Africa, all harbour examples of 

 the genus. 



Species of Lutraria. 



arcuata, Desk. maxima, Jonas. 



australis, Desk. oblonga, Gmel. 



Capensis, Desk. Philippinarum, Desk. 



curta, Desk. planata, Chem. 



dissimilis, Desk. rhynchaena, Jonas. 



elliptica, Lam. Senegalensis, Gray. 



elongata, Gray. Sieboldii, Desk. 

 impar, Desk. 



Genus ZENATJA, Gray. 



Shell oblong, elongate, compressed; umbo anterior, sub- 

 marginal; hinder gape large. Hinge with the cardinal 

 teeth distinct; lateral teeth none; ligament sub-external, 

 marginal, not separated from the cartilage. 



Ex. Z. acinacies, Quoy, pi. 102, fig. 1, 1, a. 



The species of Zenatia are confined to New Zealand; 

 the shells are much compressed, and may be readily dis- 

 tinguished from Lutraria by the position of the hinge 

 which is posterior. 



Species of Zenatia. 



acinacies, Quoy. solenoides, Desk. 



Cumingiana, Desk, 



