296 



Drake: Unrecorded Cephalopods. 



accepted for half a centur}^ or more, and have, in many instances 

 become ahiiost household words, should be allowed to remain. 

 It is not as if they could be consigned to oblivion, as they must 

 alwavs survive in a number of standard works. We have, 

 therefore, to remember at least two names where one would 

 suffice, thereby at once doing away with the whole object of 

 systematic nomenclature, which was primarily intended to 

 assist the memory.' 







UNRECORDED CEPHALOPODS FROM THE 

 YORKSHIRE OOLITES. 



HENRY CHARLES DRAKE, F.G.S., 

 Hull. 



During a recent stay in Scarborough, I was fortunate enough 

 to obtain in situ from the Scarborough Limestone of Hundale 

 Point, the greater portion of a large Amimonite. A boulder 

 had evidently fallen upon it from the cliff above, and broken it, 

 the broken portion having disappeared. The remaining part 

 shews the inside whorls perfectly. This I sent to Mr. G. C. 

 Crick, F.G.S., of the Natural History Museum, Kensington, who 

 informs me that it is Dorsetensia suh-tecta Buckman, and a 

 new record for the Scarborough Limestone. 



]\Ir. Buckman gives the following description of this Am- 

 monite in his Monograph on the Inferior Oolite Amfnonites in 

 the publications of the Palseontographical Society, 1891, page 

 309 :— 



' Discoidal, compressed, hollow carinate. Whorls broad, 

 much compressed, ornamented with arcuate, ventrally project- 

 ing ribs declining to striae in the adult. Ventral area not de- 

 fined, furnished with a very strong hollow carina. Inner margin 

 well defined, upright. Umbilicus graduated, marked with 

 obscure ribs.' 



He gives three varieties : — 



A. — Umbilicus rather open and ribbed, obscure ribs on the 

 whorl retained for some time. 



B. — Umbilicus smaller and less conspicuously ribbed ; 

 the ribs on the whorl yielding to striae at an early age. 



C. — Like B but thinner, whorls flatter, umbilicus smaller, 

 and without any trace of ribs. 



This Ammonite occurs in the Humphresianum Zone of 

 Oborne and Sherborne, Dorsetshire, but is decidedly scarce. 



Naturalist, 



