S PATH A I 32 I 



the collections of Dr. Tnnes Bey this remarkable species ; all 

 the specimens of Spatlia sent to us belong to a form much 

 smaller and proportionalh' more inflated and with thicker 

 valves. This form was certainly referred to Spatlia cailliaudi 

 by Jickeli, for he cites (p. 260) specimens corresponding in 

 dimensions to ours. 



Our species is quite near to Spafha chaiciana Rang of south- 

 ern Africa, but differs by its thicker and more inflated shell, 

 its somewhat more rostrate form and finally in general appear- 

 ance. It differs equally from Spatha arcuata Cailliaud (loc. 

 cit., pi. 61, fig. 5) by its smaller size and straight, not depressed, 

 posterior extremity. 



The Spatha innesi, like all the species of the genus, has the 

 nacre of a beautiful deep rose-color. 



Length 60, height 37, diam. 25 mm." (Pallary). 



Type locality, The Upper Nile. 

 Spatha innesi Pai.lary, Bull. Inst. Egypt, III, 1903, p. 97, pi. 



II, fig. 2. 



"This species in its external appearance quite resembles 

 Chanibardia locardi Bgt. But the Chambardias are "charac- 

 terized by the right valve being decidedly less strong, smaller 

 and notably less inflated than the left valve, especially in the 

 umbonal region," this is not the case in the Spatha innesi." 



Spatha tristis Jousseaume. 



Shell oblong, scarcely subinflated, subsolid, inequilateral ; 

 beaks slightly prominent ; posterior ridge rounded, ending in 

 a blunt point a little below the median line ; dorsal margin light- 

 ly arched ; base nearly straight ; anterior end a little narrower 

 than the posterior end. rounded, sometimes subangulate above ; 

 dorsal slope obliquely truncate ; surface having irregular 

 growth lines and traces of radial sculpture ; epidermis black- 

 ish, subshining ; anterior scars elongated, impressed ; posterior 

 scars shallow, elliptical ; nacre lurid but shining, having shades 

 of yellowish-gray and green. 



Length 65, height 37, diam. 22.5 mm. 



Upper Senegal. 



