LEILA. 507 



Genus SPATHA, Lea. 



Outer gill united to the mantle as far as its extremity ; 

 inner gill not united to the foot. 



Shell rounded, ovate, thick, covered with a reddish-brown 

 epidermis. Hinge-margin arcuated, smooth. 



Ex. S. ruhens, Lamarck, pi. 119, fig. 3, 3, a. 



The species of Spatha are from Senegal and the river 

 Nile. 



Species of Spatha. 



Chaiziana, Bang. Wahlbergi, Krauss. 



rubens, Law. 



Genus LEILA, Gray. 



Shell ovate, inflated, very inequilateral, wide posteriorly, 

 gaping at the margins, pearly within ; beaks somewhat pro- 

 minent. Hinge-margin straight, simple. Pallial sinus 

 broad, and much incurved. 



Syn. Columba, Lea, not Linn. 



Ex. L. Blainvilliana, Lea, pi. 119, fig. 4, 4, a. 



The few species of this genus described are from South 

 America. 



Species of Leila. 



Blainvilliana, Lea. Parishii, Gray. 



esula, Crist, and Jan. 



