TV. S. SucUeston — On ths Yorkshire Oolites. Ill 



wrong, describes the species which bears his name as occurring in 

 the "G. 0., Cloughton, Brandsby, C. B. Scarborough," and not in the 

 Dogger at all. 



Descriptions. — Specimen from the Dogger (zone 1), Peak (Blue 

 Wyke). Leckenby Collection (Figs. 3, 3a). 



Length 60 millimetres. 



Width of body-whorl 8^ „ 



Height of -whorl to width 76:100. 



This specimen is too much twisted to show the spiral angle 

 correctly; it is considerably worn and the apical portion is wanting, 

 yet it is far above an average of specimens in condition. The 

 spire is subcylindrical, attenuated, turrited ; height of the penul- 

 timate rather more than |^ths of the width : each whorl rises 

 anteriorly towards a strong spiral varix which contains the suture ; 

 the height of the last three whorls is nearly the same, the chief 

 increase being in the direction of the width. A slight spiral belt 

 may be noticed a little above the middle of each of the whorls, 

 which are strongly constricted about |^rds of the way down. These 

 features are very characteristic. 



Aperture oblong, with one wide fold on the outer lip, and two finer 

 folds on the columella. 



Another specimen. — Same horizon, locality and collection. Figs. 4, 

 and ia. 



Length (apex restored) 53 millimetres. 



Width of body-whorl 7| ,, 



Height of whorl to width 75 : 100. 



Spiral angle 7°. 



As regards ornaments this specimen is in rather better condition 

 than the other, and it suggests that there may be some difference in 

 the style of the earlier and later whorls. The upper -fths of the 

 lower whorls is seen to be nearly flush with the preceding varix, 

 and to have very faint spiral lines : then comes the median varix 

 (less prominent than the sutural varix), and then the smooth con- 

 stricted area occupying the lower fths. 



These details seem to have been somewhat obliterated by usage 

 in the larger specimen. 



? A young specimen. — Same horizon and locality, York Museum. 

 Figs. 5 and 5a. 



Length 11 millimetres. 



The condition is scarcely favourable for obtaining accurate pro- 

 portions. The general aspect (due allowance being made for the 

 exaggerations of enlargement) is not unlike what we might expect 

 of the apical conditions of N. cingenda. 



Specimen from the same horizon and locality, Leckenby Collec- 

 tion. Figs. 6 and 6a. Placed under N. cingenda provisionally. 



Length 27 millimetres. 



Width 3f 



Height of whorl to width 90 : 100. 



Spiral angle ? 7°. 



Shell attenuated, subcylindrical : whorls but slightly wider than 

 high, and increasing suddenly below the sutures, which are open. 



