144 



PKOF. T. R. JONES ON NTJMMTJLITES ELEGANS 



One of Sowerby's speci 

 mens 



Specimens from Alum 

 Bay (bed "no. 29") 

 flattened by pressure. 



From Whitecliff Bay N 

 (Keeping's Prestwichi- 

 amis-bed). Nearly all }■ 

 the specimens are flat- j 

 tened by pressure / 



From Highcliff (" D," 

 Keeping), not flattened 

 by pressure 



From Hunting Bridge, . 

 New Forest 1 



Measurements in 

 millimetres. 



Diameter. 



H 

 if 



2* 



ordinary 



ordinary 

 3 



3 



% 



2 



H 

 ? 



? 



Thickness. 



i 



4 



1 



3 



i 



3" 

 ?t 

 ? 



? 



? 



J, 

 2 



2 



Number 

 of whorls. 



4? 

 4? 

 4? 



4 

 4 

 4? 

 4? 



Number of chambers 

 in the whorls. 



1st. 



9? 



2nd. 



13 

 14 



14 

 13 



14 



12 

 15 

 15 

 14 



3rd. 



14? 

 21 



20 

 ? 



19 



18 

 20 



? 



? 



In Bed " no. 29 " the specimens are thin and compressed, with 

 the alar prolongations (" ahe," or lateral extensions) of the chambers 

 nearly all reaching the centre, somewhat curved; more sinuous 

 and less regular in old individuals (PL XI. fig. 1). From the 

 Hunting-Bridge beds specimens given to me by the Rev. 0. Fisher, 

 F.G.S., are only slightly flattened ; their alse reach the centre. 

 Mr. Keeping's specimens " B," from Hunting Bridge, are not flattened ; 

 their alae generally, but not in every case, reach the centre. Those 

 from Highcliff (Keeping, "D") are not flattened ; their alse reach the 

 centre. Some individuals of elegans have partially radiate or 

 plicate surfaces, due to the lessening of the septal ribs and a local 

 convexity of the alar parts of the chambers, probably the var. 

 plicata, He la Harpe (see above, p. 140). 



For the localities of Sowerby's JV. elegans (or Prestwichiana) we 

 find in the c Cat. Foss. Foram. Brit. Mus.' 1882, pp. 22-25 (besides 

 the Bed "no. 29 " at Alum Bay) Bracklesham, F.Edwards ; biconvex 

 variety, Bracklesham, F. Edwards ; Barton, F. Edwards ; Barton, 

 with N. variolarius, F. Edwards ; Emsworth, with 2\T. variolarius, 



* In the Museum of Practical Geology, Jermyn Street. See PI. XI. fig. 1. 

 t These were ground down without their thickness having been measured. 

 They probably ranged about ^ millim. 



