114 



MlTRA BUENUPIANA, N.SP., FROM SOUTH AFRICA. 

 By the Eev. Dr. A. H. Cooke, F.Z.S. 

 Bead Htli June, 1920. 

 In a paper recently read ^ before the Zoological Society of London, 

 mention was made of an undescribed species of Mitra, received from 

 Durban through Mr. H. C. Burnup, and provisionally labelled as 

 " M. circula, Kien., var." The form of the radula, as was there 

 explained, sufficiently differentiated the so-called variety from 

 M. circula typical ; it now remains to record the difference between 

 the two species conchologically. Here we have the advantage of 

 Mr. Burnup's own notes on a number of specimens. The new species, 

 to which we propose to attach the name burnupiana, belongs to that 

 group of Mitra provisionally separated ofi as " group (7) of 

 sphcerulata ", a group very far removed, by the radula, from the 

 "group (10) of scabriuscula " , to which M. circula belongs. 



1. 2. 



Fig. 1. — M. circula, Kien. Fig. 2. — M. burnupiana, Cooke. 



Mitra burnupiana, n.sp. 



(Mr. Burnup's notes take the form of a comparison between the 

 so-called " var." and the typical circula, Kien.) 



" The ' var.' is not so narrow or elongate. A much greater pro- 

 portion of the whole length of the shell is occupied by the body- 

 whorl, so leaving the spire shorter. The body-whorl and spire are 

 also considerably wider. 



" The sculpture is somewhat similar, but the longitudinal grooves 

 are both deeper and further apart in the ' var.', cutting the spiral 

 costse into much larger beads than in circula, and converting the 

 intercostal threads into series of smaller oblong beads. 



" The aperture is wider, especially below the middle, and also 



1 " The Radula of the Mitridae " : Proc. Zool. Soc. Lond., 1919, pp. 405-422. 



