PURPURINA. 87 



in this country. In the typical P. bellona the spire is always higher, and the out- 

 line is more angular. 



P. elaborata is somewhat scarce in the Sowerbyi-hed at Bradford Abbas. Most 

 of the specimens found in the Murchisona-zone of the Cotteswolds must be referred 

 here, as also the very stunted forms occasionally met with in the Lincolnshire 

 Limestone. The Nerinaa-bed of the Yorkshire Dogger has yielded a very few 

 characteristic specimens (N.B. The specimen from the Dogger, fig. If/, is very 

 inferior to some since obtained). On the whole then, P. elaborata is the charac- 

 teristic Purpurina of the Lower Division, whilst P. bellona is restricted to the 

 Upper Division. One specimen from the Murchisona-zone of Normandy is in 

 Prof. Deslongchamps' cabinet. 



2. Purpupjna : Species or Variety. Plate I, figs. 4 a, b. 



1853. Cf. Turbo elaboeatus, Lycett. Prop. Cotteswold Field Club, vol. i, p. 77, 



pi. ii, fig. 1. 



Description. — Shell ovate ; whorls about five, canaliculate towards the suture 

 with subtumid flanks. The whorls of the spire are ornamented by stoutish longi- 

 tudinal ribs, but these fail throughout the greater part of the body whorl. The 

 spirals are moderately wide apart, and fine axial strise may be noted in the 

 interspaces. 



The aperture is suborbicular, and the traces of the Purpurina-notch are very 

 slight. 



Relations and Distribution. — This species or variety possesses the flattened 

 whorls of P. elaborata with much of the reticulate ornamentation of the species 

 next described. The peculiar appearance of the aperture maybe due to distortion, 

 but it greatly resembles Lycett's figure in the ' Proc. Cotteswold Field Club. 

 The condition of the shell is such that no further comparisons can be made. 



The specimen is from the Oolite-Marl. If a temporary name is required it 

 might be known as Purpurina aperta. 



3. Purpurina cancellata, sp. nov. Plate I, figs. 3 a, b. 



Description : 



Length . . . . .21 mm. 



Ratio of width to length . . . 69 : 100. 



