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NOTE ON A DIBRANCHIATE CEPHALOPOD FROM THE LONDON 

 CLAY OF SHEPPEY. 



By G. C. Crick, F.G.S., etc., 



Of the British Museum (Natural History). 



Read Uth June, 1901. 



The specimen forming the subject of the present note (see 

 Pigs. I & II) is a conically- shaped cast in iron-pyrites, having on its 

 surface indications of a number of septa. It was found in the London 

 Clay of the Isle of Sheppey, and was forwarded to Dr. H. Woodward 

 by Mr. W. H. Shrubsole, who writes: "It is the first I have seen, 

 and differs somewhat from the specimens from the London Clay." 



I. II. 



Beloptcra (Behpterina) Levesquei, D'Orbigny. — I, ventral aspect of natural cast in 

 iron -pyrites of conical cavity of rostrum; II, lateral aspect of the same. 

 London Clay : Isle of Sheppey. x #. 



The cone, which is truncated, has an apical angle of from 12° to 13° 

 between the two sides, and from 10° to 11° between the ventral 

 and dorsal surfaces ; it is 34 mm. long and nearly circular in cross 

 section, the diameter of the larger end being 13 mm. and of the 

 smaller end 3*5 mm. The fossil is slightly curved, particularly the 

 smaller or posterior end ; the inner surface, i.e. the ventral, is a little 



