1366 MUTEI.A 



M. opalescens; moreover the transverse striae do not appear in 

 the interior of the shell as in that species. 



Length of type specimen 81, height 36 mm." (Preston). 



Type locality, Karonga, north end of Lake Nyassa. 



■'I have before me a good series of this shell, the largest 

 specimen measuring 42.5 by 97 mm.'' 

 Mutela cuneata Prijston, xAnn. Mag. Nat. Hist., (8), VI, 1910, 



p. 62, pi. V, fig. 13. 



Mutela aixuaudi Germain. 



'"Shell quite large, generally rectangular-elongate, very glo- 

 bosely inflated; valves very convex with the greatest diameter 

 near the dorsal margin, gaping in front and nearly the whole 

 length of the ventral margin, widely gaping posteriorly ; dor- 

 sal margin straight ; ventral margin straight, very slightly sin- 

 uous in the middle, parallel to the dorsal margin ; anterior re- 

 gion rounded ; posterior region almost regularly rectangular, 

 almost twice as long as the anterior, obliquely and sharply 

 truncate at the extremity ; dorsal ridge low ; beaks slightly in- 

 curved, quite prominent, eroded, and showing an extremely 

 iridescent nacre ; ligament prominent, strong, 40 mm. long, 

 very beautiful brilliant chestnut-color ; hinge filiform ; anterior 

 muscular impressions round and well marked, the posterior 

 larger and deeper, pallial well marked. Shell thick, solid, quite 

 "brilliant, epidermis a vinous chestnut slightly tinged with yel- 

 low, lighter near the beaks ; lines of growth very fine and 

 slightlv unequal, a little stronger posteriorly : nacre very iri- 

 descent, with coppery reflections near the ventral margin. 



Length 84, of anterior region 30, of posterior region 56, 

 height 37, diam. 31 mm." (Germain). 



Type locality, Lake Albert-Nyanza. 

 Mutela alluaudi Germain. Bull. Mus. Hist. Nat., 1910, p. 544, 



pi. VIII, fig. 45. 



"This magnificent shell reminds one, by its coloration, of the 

 species of the genera Pseudospatha and Braa-r-ea of Lake Tan- 

 ganyika." 



