112 MOLLUSCA OF THE GREAT OOLITE OF YORKSHIRE. 
CeritHi1umM Branu. Plate XV, fig. 5. 
C. Testa pared, turritd, apice obtuso, anfractibus numerosis angustis, subplanis, 5 
costatis ; costis tuberculosis, tuberculis circa 16 in ambitu; costis inequalibus ; suturis 
anfractibus profundé depressis. 
Shell small, turreted; apex obtuse; volutions numerous, narrow, rather flattened, 
encircled with five rows of coste ; coste tuberculated, the tubercles being about 16 in a 
volution ; ribs unequal; the sutures of the whorls deeply depressed. 
The third and fifth row of cost are less prominent than the others, the tubercles are 
large and prominent, the length of a volution is less than half its transverse diameter, the 
first two volutions are nearly smooth. Length 5 lines, transverse diameter 2 lines. 
Locality. Near Scarborough. 
Natica appucta. Plate XV, figs. 17, 17a. 
Natica appucta, Phillips. 1835. Geol. of York., vol. i, t. 9. fig. 30. 
— — Williamson. Geol. Trans., 2d Series, vol. v, p. 241. 
= _ D’Orb. 1850. Prod. Paléont., p. 264. 
N. Testd globosd, spird elatd, anfractibus (4) converis, superné rotundatis, suturis 
depressis, anfractu ultimo obliquo ; apertura ellipticd, umbilico obtecto. 
Shell globose, spire elevated and pointed, whorls (4) convex, with depressed sutures, 
their upper portions rounded ; the last whorl oblique; aperture large, elliptical ; inner lip 
with a covered umbilicus. 
Natica grandis, Goldfuss, is our only Great Oolite species which approaches near to 
this form; but that shell, though greatly expanded, has not more volutions than the present 
species, a fact which militates greatly against their identity. Length 9 lines, breadth 
8 lines. 
Locality. Great Oolite near Scarborough. ‘The original specimen figured by Phillips. 
Natica PuncTURA. Plate XV, figs. 18, 184. 
LitTorIna PuNCTURA, Bean. 1839. Mag. Nat. Hist., p. 62, fig. 23. 
_— — Morris. 1843. Cat. Brit. Foss., p. 149. 
N. Testa ovato-ventricosd, spird elatd, acutd ; anfractibus (6) convexiusculis, suturis 
profunde impressis; anfractu ultimo magno, punctato et cingulato ; punctis minutis, in 
