SOUTH AFRICAN MARINE MOLLUSKS. 45 



in turn are marked by spiral lirations. The axial sculpture consists 

 of fine, retractive threads, which are best developed in the grooves 

 that separate the spiral cords. Suture slightly channeled . Periphery 

 not markedly differentiated. Base rather long, marked by 18 low, 

 feebly rounded, spiral cords, which become more distantly spaced, 

 more elevated, and narrower anteriorly. These cords are crossed by 

 microscopic spiral lirations. The axial threads are continued on the 

 base. Avarix is apparent a little behind the aperture. Aperture 

 bluish white, narrowly ovate, channeled anteriorly, posterior angle 

 acute; outer lip reflected, provided with 14 strong denticles; inner 

 lip strongly developed, reflected over the base with the edge free; pro- 

 vided with five strong, oblique folds and three weaker ones between 

 the posterior four. These weaker folds join the posterior strong 

 neighbor at their outer edge. The strong folds decrease in strength 

 successively from the posterior anteriorly. Parietal wall glazed by a 



thin callus. 



The type and another specimen, Cat. No. 272154, U.S.N.M., came 

 to the United States National Museum in a donation from Mr. John 

 B. Henderson, in a collection purchased by him from Sowerby and 

 Fulton, labelled: " Mitra limbifera Lamarck, from South Africa," 

 while the pages of this paper were going through press. I am there- 

 fore unable to include a figure of it. It differs from limbifera by 

 being much more strongly sculptured than that species, also in the 

 number of the columellar plaits. The type has eight whorls, and 

 measures: Length, 29.4 mm.; diameter, 12.4 mm. 



MITRA MERULA Sowerby. 



Cat. No. 186732, U.S.N.M., four specimens from Port Alfred (Coll. 

 No. 91). 



MITRA SIMPLEX Reeve. 



Cat. No. 31901, U.S.N.M., one specimen from Cape of Good Hope. 

 Cat. No. 13925, U.S.N.M., another from the same place. Cat. No. 

 98012. U.S.N.M., five from Albany, South Africa. 



Cat. No. 272157, U.S.N.M., an additional specimen from South Africa. 



MITRA, species? 



Cat. No. 250345, U.S.N.M., contains two badly worn specimens of 

 a medium sized, short, stout, brown species, from Port Alfred, which 

 I am unable to refer to any of the known species (Coll. No. 1218). 



MITRA PATULA Reeve. 



Cat. No. 186731, U.S.N.M., eight specimens from Port Alfred (Coll. 



No 90) 



' ' MITRA PICT A Reeve. 



Cat. No. 186729, U.S.N.M., three specimens from Port Alfred (Coll. 

 No. 88). Cat. No. 186975, U.S.N.M., two from Port Alfred (Coll. 

 No. 507). Cat. No. 272153, two from South Africa. 



