94 GASTEROPODA OF THE INFERIOR OOLITE. 
13. Purpurina TaBuLata, sp. nov. Plate II, figs. 4 a, b, c. 
Description : 
Length of a large specimen . : . 20 mm. 
Ratio of width to length : ; . 80:100. 
Length of body-whorl to entire shell : ta OS OO. 
Spiral angle : : S08 
Shell conoidal, subglobose, almost imperforate. Whorls about six, angular and 
widely tabulate, slightly tumid on the flanks. The longitudinal ornament is very 
feeble, especially in the body-whorl; it is better shown on the tabular area, where 
the cost are split by lines of growth. ‘The keels are delicately crenulate. The 
spirals are regular, numerous, and rather fine; they do not extend over the 
tabular area. 
Aperture ovate to subquadrate, wide, and bearing considerable resemblance to 
that of P. elaborata. 
A less tumid variety (Pl. II, fig. 4 d, e), with better developed costa, serves to 
connect this species with P. curta (Pl. I, fig. 6 a, b), which, however, has well- 
developed costz and a somewhat longer spire. This variety might be called 
P, SUBCORONATA. 
Relations and Distribution.— P. tabulata is near to P. coronata, H. and D. (‘ Foss. 
Mont.-Bellay,’ p. 25, pl. i, fig. 7), but that small and tabulate species is beautifully 
cancellated. 
Rather rare in the Sowerbyi-bed of Bradford Abbas and Stoford. 
The following list summarises the results as regards the Purpurines, strictly 
so called, of the Inferior Oolite in England. 
Bellona Group. 
Purpurina elaborata, M. and L. Purpurina curta, sp. nov. 
—  ‘aperta.”’ — _ parcicosta, sp. nov. 
—  cancellata, sp. nov. — _ aspera, sp. nov. 
—  bellona, D’Orb. —  calear, sp. nov. 
— = — var. pagoda. 
Inflata Group. 
Purpurina inflata, Tawney. Purpurina rotunda, sp. nov. 
— ef. Sowerbyi, Waagen. —  tabulata, sp. nov. 
