112 MOLLUSCA OF THE GREAT OOLITE OF YORKSHIRE. 



CERITHIUM BEANII. Plate XV, fig. 5. 



C. Testa parvd, turritd, apice obtuso, anfractibus numerosis angmtis, subplanis, 5 

 costatis ; costis tuberculosis, tuberculis. circa 16 in ambitu ; costis inasqualilus ; suturi* 

 anfractibus profunde depressis, 



Shell small, turreted; apex obtuse; volutions numerous, narrow, rather flattened, 

 encircled with five rows of costse; costae tuberculated, the tubercles being about 1C in a 

 volution ; ribs unequal ; the sutures of the whorls deeply depressed. 



The third and fifth row of costae 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 ADDUCTA. Plate XV, figs. 17, 17. 



NATICA ADDUCTA, Phillips. 1835. Geol. of York., vol. i, t. 9. fig. 30. 

 Williamson. Geol. Trans., 2d Series, vol. v, p. 241 . 



D'Orb. 18.50. Prod. Paleont., p. 264. 



N. Testa olobosd, spird elatd, anfractibus (4) convcxis, superne rotunda/is, tsuluris 

 depressis, anfractu ultimo obliquo ; aperturd 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 PCNCTURA. Plate XV, figs. 18, 18. 



LITTOBINA PONCTUEA, Bean. 1839. Mag. Nat. Hist., p. 62, fig. 23. 

 Morris. 1843. Cat. Brit. FOBS., p. 149. 



N. Testa ovato-ventricosd, spird elatd, acutd ; anfractibus (6) convexiusculis, suturix 

 profunde impressis ; anfractu ultimo mat/no, punctate et cinoulato ; puncfis minutis, in 



