STATHA 1349 



from S. vignoniona. I'he dimensions given for this species 

 are, no doubt, erroneous and probably the result of a typo- 

 graphical error. The statement that the length is 17 milli- 

 meters should read 70 or 71, I presume. 



Spatha skmicorrugata Preston. 



"Shell oblong, solid, covered with a blackish-brown perio- 

 stracum, which is minutely wrinkled posteriorly, sculptured 

 with rather coarse lines of growth and corrugated on the upper 

 portion of the posterior side ; umboes small, situated somewhat 

 anteriorly; ligament elongate, not prominent; dorsal margin 

 slightly arched posteriorly, sloping anteriorly ; ventral margin 

 nearly straight; anterior side angled, bluntly acuminate; in- 

 terior of shell rosy pink, iridescent, especially towards the 

 margins. 



Long. 51.5, lat. ^y mm." (Preston). 



Type locality, Lower Congo. 

 Spatha scmicorrugata Preston, Ann. Mag. Nat. Hist., (8),. 



IV. 1909, p. 90, pi. IV, fig. 7. 



Spatha kamerunensis Walker. 



"Shell oblong-ovate, somewhat inflated, subsolid ; beaks 

 eroded, but apparently only slightly elevated, sculpture not 

 observed, placed about 1-5 of the total length from the anterior 

 end ; anterior end regularly rounded ; basal and dorsal lines 

 nearly parallel, slightly diverging posteriorly ; basal line nearly 

 straight, in some specimens slightly arcuate ; dorsal line 

 straight or slightly curved ; dorsal slope oblique ; posterior end 

 somewhat prolonged and regularly rounded ; posterior ridge 

 rounded, exhibiting in some specimens, a subobsolete angle, 

 terminating at the lower end of the dorsal slope ; dorsal slope 

 sculptured with fine, radiating ridges, curving upwards to- 

 wards the hinge ; surface of the disk subsulcate with strong 

 lines of growth, cut by very fine, impressed, radiating lines, 

 between which the epidermis is minutely and irregularly wrink- 

 led or festooned ; epidermis verv dark brown, almost black 

 towards the margins; hinge edentulous; beak cavity shallow, 

 with a single, deep, dorsal cicatrix directly under the beak r 



