SPATHA I 3 19 



Spatha i.Fpsii Jickeli. 



Shell subrhomboid, scarcely inflated, somewhat inequilateral, 

 subsolid ; beaks but little elevated, sculptured with well-marked 

 concentric striae, which extend over the whole shell ; posterior 

 ridge low, rounded ; anterior end rounded, subangulate above, 

 a little narrower than the posterior end ; dorsal and ventral 

 lines nearly straight ; posterior end obliquely truncate above, 

 rounded below the middle ; epidermis fuscous-olive ; hinge cal- 

 loused, edentulous ; nacre white or rose-colored, pearly. 



Length 98, height 64, diam. 33 mm. 



Upper Eg>"pt ; Senegal. 

 Spatha lepsii Jickeu, Faun. L. and S. W. Moll., 1874, p. 265, 



pi. IX, fig. 4. — Simpson, Syn., 1900, p. 896. 

 Spatha nibens var. lepsii Germain, Arch. Zool. Exp. et Gen., 



('5), I, 1909, p. 55. 



Exceedingly close to S. chaiziana, from which it dififers in 

 t)eing a little more elongated, more strongly sculptured, less 

 brilliant and more obliquely truncated behind. I think it quite 

 probable that a good series would show absolute connection 

 between them. 



Spatha chaiziana (Rang). 



Shell rather short, subrhomboid, subinflated, slightly inequi- 

 lateral, subsolid; beaks somewhat prominent; posterior ridge 

 moderately full, rounded ; dorsal outline lightly arched, straight 

 or incurved a little in front of the beaks ; base straight or in- 

 curved in the middle, full behind the middle ; anterior end 

 narrowed, rounded, angled above ; posterior end almost square- 

 ly sobtruncate behind, rounded below ; surface feebly, concen- 

 trically sculptured, almost smooth and shining except at the 

 ends ; color rich reddish-brown, ashy-tinted at the umbonal 

 region ; muscle scars shallow ; dorsal scars narrow, not deep ; 

 nacre coppery or salmon-tinted, rich and brilliant, having a 

 metallic lustre. 



Length 82, height 56, diam. 33 mm. 



Senegal: Niger; Upper Nile; West Africa. 

 Jinodonta chaiziana Rang, Mem. Aceph. Senegal, (Nouv. 



Arch. Mus.), 1835. p. 13, pi. xxviii. 



