PURPURINA. 91 



8. Purpurina aspera, sp. nov. Plate I, figs. 11 a, b ; 11 c, d ; 11 e. 



Description : 



Length of a well-grown specimen . . 26 mm. 



Ratio of width to length . . . 75 : 100. 



Length of body-whorl to entire shell . . 60 : 100. 



Spiral angle .... 70°. 



Shell ovate-conoidal ; spire rather more than four-tenths of the entire length. 

 Whorls seven in number, angular ; posterior area sloping outwards, anterior area 

 sloping inwards. Keels submedian, and coarsely crenulate where the longitu- 

 dinals or costge cross over. Costge few but prominent, and well- continued through- 

 out the body-whorl except in the neigbourhood of the columella. The spirals 

 on the posterior area of the whorls are fine and numerous, those on the anterior 

 area are few in number (about three on the whorls of the spire), coarse and wavy. 

 The spirals in the base are thicker and much striated longitudinally. Shell 

 substance very thick. 



Aperture subquadrate and rather restricted ; columella encrusted and strongly 

 reflexed, so that the anterior canaliculation is. very pronounced. Umbilical slit 

 narrowed and long. 



Relations and Distribution. — This fine and characteristic Purpurine is, in many 

 respects, widely removed from P. elaborata, and yet these two species are connected 

 through the variety pagoda, and the numerous other varieties of P. bellona. Also, 

 instead of the shallow anterior groove of that species, P. aspera is deeply canali- 

 culate. 



These very coarsely ornamented forms are characteristic of the Soiverbyi-bed 

 of Bradford Abbas, where P. aspera is moderately abundant. 



The specimen, PI. I, fig. 2, is also from the Sowerbyi-bed of Bradford Abbas. 

 It is an exceptional form, but I have not ventured to name it. 



9. Purpurina CALCAR, sp. nov. Plate II, figs. 1 a, b. 



Description : 



Length . . . . .19 mm. 



Ratio of width to length . . . 80 : 100. 



Length of body- whorl to entire shell . . 60 : 100. 



Spiral angle .... 75°. 



Shell conical. Whorls about six, very angular ; posterior area slightly sloping 

 outwards, anterior area slightly sloping inwards. Keels of the whorls of the spire 



