MOLLUSCA. 33 



radiating from the centre. The teeth of the outer range are nearly round, 

 smooth, and larger than the inner." It may be added that the figure shows that 

 the central row of teeth are quite smooth and much larger than the others — 

 16 mm. X 7^ mm. The type is from the Great Oolite of Marquise. 



Description.- — -The teeth referred here to this species are remarkable for 

 their size, being about 12 mm. by 8 mm. They are oval in outline and their 

 uniformly convex surface of elliptical transverse section is quite smooth and 

 shining. On the strength of isolated teeth it is very speculative to refer to any 

 definite species, but in this case the size is so exceptional in comparison with 

 that of the side teeth that the speculation seems justified. 



Distribution. — The specimens have all been obtained from St. Botolph's Bridge 

 cutting, near Peterborough, now grassed over. There are a considerable number 

 of them in the British Museum, and more in the Sedgwick Museum. It does not 

 seem impossible that these may have been derived from lower beds in the cutting. 

 I have not been able either to verify their occurrence in the Oornbrash nor, on the 

 other hand, to find anything to throw doubt on it. 



MOLLUSCA. 

 Class CEPHALOPODA. 



Order NAUTILOIDEA. 

 Family Nautili dm. 

 Genus NAUTILUS, Breyn. 

 1732. Breynius, Dissertatio physica tie Polythalamiis. 



Amidst the numerous changes that have taken place in recent years in the 

 subdivision of the Nautili, those in Cornbrash times have been left intact under 

 the original title. The following are the species up to the present recorded as 

 occurring in the Cornbrash : 



*N. baberi (44). N. injlatus (23, 27). 



*N. hexagonm (28). N. lineatus (24). 



N. THUNCATUS (23). 



N. baberi is recorded with a ? from Bourn, but as no specimen so labelled is 

 found in the Museum of Practical Geology, or elsewhere, it may be passed b}'. 

 JV. hexagonus is Wright's determination of a Scarborough fossil, labelled by 



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