PURPURINA (EUCYCLOIDEA). 95 
Section IT.—Purevrina, Auctorum nonnullorum. 
A considerable modification in the diagnosis of the genus is required to 
admit the following species; where the spire is longer, the body-whorl less tumid, 
and the whole shell angular and eucycloid. Indeed, I should prefer to distinguish 
this group as Hucycloidea—small shells with carinated whorls; carinze median and 
crenulate ; aperture rhomboidal, with a short and narrow anterior canaliculation. 
14, Purrorina (Evcycnorpea) sranor, D’Orbigny, 1850. Plate II, figs. 5 a, b, ¢; 
5d,e; 5f, 9, h 
1850. Turso Branor, D’Orbigny. Prod. 1, Et. 10, p. 266. 
1852. Purrurrna Branor, D’Orbigny. Ter. Jur. 2, pl. 331, figs. 14, 15. 
1860. Cf. also Purpurina Granvutata, Héb. and Desl. Foss. de Montreuil- 
Bellay, p. 28, pl. 7, 
fig. 9. 
Bibliography, Sc.—I can find no adequate description of P. bianor. In the 
Prodrome, D’Orbigny merely says that 7. bianor is near to T. belia, but more 
elongate, more carinate in the middle of the whorls, and without crenulations. 
Occurs at Port-en-Bessin. In the ‘ Terrains Jurassiques’ no text accompanies the 
figure of P. bianor. On the other hand, our shell greatly resembles specimens from 
Normandy, which Prof. Deslongchamps and other paleontologists refer without 
hesitation to P. bianor, D’Orb. These occur in the beds of Bayeux. 
P. granulata, H. and D., greatly resembles some of the larger specimens from 
Vitney Cross, but on the whole the ornamentation of P. granulata is richer, 
especially on the carine. But if the Vitney Cross specimens were as well preserved 
as those from the Callovian of Montreuil-Bellay, it might, perhaps, be more difficult 
to indicate the difference. 
Description : 
Length of a well-grown shell. : . 13 mn. 
Ratio of width to length : : « Go2100; 
Length of body-whorl to entire shell : » So Lo: 
Spiral angle 55°. 
Shell conical, eucycloid; spire nearly halt the length of the shell, apex sharp. 
Whorls about seven in well-grown specimens, very angular, having a strong keel, 
which is median in the whorls of the spire; body-whorl with one strong keel, and 
showing no distinctive base. The keels are regularly and finely crenulate (differing 
