SPATIIA 1325 



Spat ha mabillei Jousseaumk, Bull. Soc. Zool. de Fr., XI, i* 



p. 495, pi. XIV, figs. 2, 2a. — Simpson, Syn., 1900, p. 879. — 



Germain. I'Afriqne Cent. Fr., 1907, p. 555. 



This is exceedingly close to 5. droueti and may be merely a 

 form of that. Tt seems to be higher in proportion to length, 

 to have more brilliant nacre and deeper anterior scars. 



Germain, (1. c), says: "This species is certainly very close 

 to Spatha chaiaiaiia, but is to be distinguished by its more 

 compressed form and less developed and more widely rounded 

 posterior region." 



Var. maniouncnsis Germain. 



"Shell subrectangular, compressed ; valves moderately thick, 

 solid ; dorsal margin nearly straight, slightly ascending ; ven- 

 tral margin straight, nearly parallel to the dorsal margin ; an- 

 terior region moderately developed, semi-circular ; posterior 

 region sub-oval, scarcely twice as long as the anterior ; beaks 

 very slightly projecting; ligament 14.5 mm. long; anterior 

 muscular impressions moderate, posterior feeble. Epidermis 

 deep chestnut, almost black, very brilliant ; lines of growth 

 moderate and irregular ; nacre violaceous, quite iridescent. 



Length 61, height 40.5, at beaks 20.5, diam. 23 mm." ( Ger- 

 main \ 



Type locality, Le Mamoun, Senoussi Country. 

 Spatha mabillei var. manioimensis Germain. Bull. AIus. Hist. 



Nat., 1907, p. 67 ; I'Af rique Cent. Fr., 1907, p. 556, fig. 92. 



"Compared with the type, the variety maniouncnsis is dis- 

 tinguished by its less elongated form ; by its posterior region 

 much less elongated with the margin more regularly convex ; 

 by its straight dorsal margin, nearly parallel to the ventral 

 margin ; by its shorter ligament ; etc." 



Spatha adansoni (Jousseaume). 



Shell elongated, subrhomboid, somewhat inflated, thin, in- 

 equilateral ; beaks moderately full ; posterior ridge rounded, 

 ending in a point at a little distance above the base : dorsal 

 and basal lines almost straight and parallel; anterior end 



