smith: on shells peom central afeica. 15 



ligarnentum tenue, elongatum, marginem totum occupans ; cicatrix 

 antica baud profunda, irregulariter rotundata, postica obscura, super- 

 ficialis. Long. 104, alt. 68, diam, 16 mm. 



Hob. — Lake Mweru. 



Only a single left valve of this species was obtained. The diameter 

 above given is supposed to be that of a complete specimen. The 

 radiating lines are hair-like and scarcely noticeable unless specially 

 looked for. Spatha alata^ Lea, from Lake Nyassa, is an allied species, 

 but less winged. 



