204 TT. H. Eudleston—On the Yorkshire Oolites. 



figured by Morris and Lycett is Phillips's original. Their figure is 

 a faithful portrait of a large and much defoimed specimen now in 

 the collection of the Yorkshire Philosophical Society. 



Description. — Specimen from the Scarborough Limestone (zone 3). 

 Leckenby Collection. 



Length 29 mm. 



Width 18 ,, 



Eatio of body-w^horl to entire shell 69 : 100. 



Spii-al angle 66°. 



Shell short, conical, not umbilicated : spire with a sharp apes. 

 Whorls 5 or 6, angular and carinated in the neighbourhood of the 

 suture, which is channelled. Body-whorl strongly bicarinated, the 

 keel near the suture being obtuse, the median keel sharp and pro- 

 minent ; intervening area depressed. No impression of the median 

 keel upon the internal cast. Aperture oval, subject to a slight 

 angularity of the outer lip. No umbilical groove, and but little 

 trace of callus. 



Belations and Distribution. — This very curious species seems to 

 stand by itself in the Yorkshire beds, and its generic position has 

 been variously defined. Natica, Etispira, Phasianella, all have served 

 in turn. It represents on this horizon a group of forms to which 

 I have referred in constituting the genus. Eegarding the whole 

 group as Natico-chemnitzoid, this species has more affinities with the 

 latter than with the former. The character of the aperture favours 

 this view, but still more the bicarinated whorl and median de- 

 pression. Compare also Chem. abbreviata, Eom. 



Cloughtonia cincta is pretty common in all three zones of the 

 Inferior Oolite of the Yorkshire coast, and has been found on the 

 same horizon in the Castle Howard district. The largest specimens 

 known to me are from the Dogger. It occurs also in the Lincoln- 

 shire Limestone at Ponton, but beyond that I have not traced it 

 at present, though it might be looked for in parts of North Oxford- 

 shire, as at Combe Hill. 



EXPLANATION OF PLATE V. 

 Fig. 1. Fusus ? STp. Dogger, Blue Wyke. My Collection, a front view; Shack 

 view. 



2. Fmyurina elaborata, Bean, var. Bajocensis. Dogger, Blue "Wyke. Leck- 

 enby Collection. 



3. Purpurina condensata, Heb. and Desl. Kelloway Rock, Scarborough. 

 Bean Collection, British Museum, a front view ; b back view. 



4. Natica cincta, Phillips. Type Refigured. Whitwell Oolite, near Castle 

 Howard. Collection of the Leeds Philosophical and Literary 

 Society. 



5. Ibid. Small specimen. Dogger, Blue Wyke. Bean Collection, 

 British Museum. 



6. Natica adducta, Phillips. Dogger, Blue Wyke. Collection of the Scar- 

 borough Philosophical Society. 



7. Ibid, canina, var. Dogger, Blue Wyke. Leckenby Collection. 



8. Natica proxitna, sp.n. Dogger, Blue Wyke. Leckenby Collection, a 

 front view ; b back view. 



9. Natica proxima ? Aged specimen, with lines of growth strongly brought 

 out. Dogger, Blue Wyke. My Collection. 



10. Natica punctura, Bean — ? iV. Bajocensis, D'Orb. Dogger, Blue Wyke. 

 Leckenby Collection, a front view ; b back view. 



