PURPURINA. 93 
P. inflata is characteristic of the Parkinsoni-zone of Burton Bradstock and the 
neighbourhood. The Sauzei-bed at Oborne also yields it, and specimens resembling 
this species are in Mr. Buckman’s collection, said to come from East Coker, zone 
unknown. It also occurs at Dundry, and in the Inferior Oolite of Rodborough 
Hill, and Cold Comfort. 
In Normandy it is fairly abundant in the “ Oolithe ferrugineuse,” whence many 
fine specimens are to be seen in Prof. Deslongchamps’ collection. 
11. Purrurina: Cf. Sowersy1, Waagen, 1867. Not figured. 
1867. Pourpurina Sowrersyi, Waagen. Zone of Am. Sowerbyi, in Benecke, p. 105, 
pl. v, figs. 3, 4a, b,c. 
A globose Purpurina which differs from P. inflata, in having the shoulder of 
the whorl sloping, and scarcely canaliculate, is of rare occurrence in the Sowerbyi- 
bed of Bradford Abbas. The spire also is rather shorter, and the costz have a more 
decided inclination from left to right. 
12. Purportna RoTUNDA, sp. nov. Plate II, figs. 3 a,b, c; 3 d. 
Description : 
Length of well-grown shell : : . 23 mm. 
Ratio of width to length : ; a oa LOO: 
Length of body-whorl to entire shell ‘ 1 O83 100. 
Spiral angle - : 90°. 
Shell ovate-globose, rather widely umbilicated. Whorls five to six, tumid and 
canaliculate near the suture; body-whorl much inflated. The cost are feebly 
developed on the whorls of the spire, and more or less effaced on the body-whorl. 
The spirals are numerous and regular in their increase and relative distance. 
Aperture widely ovate, with but slight traces of canaliculation. 
Relations and Distribution.—Though not more tumid than P. inflata this is the 
most globose of all the Purpurines. It is further distinguished by a good sized, 
circular umbilicus. The aperture is, perhaps, the least canaliculate of any known 
species. 
Rare in the Sowerbyi-bed of Bradford Abbas and Stoford. 
