116b YORKSHIRE TYPE AMMONITES— II July 



116. AMMONITES VERTUMNUS, Bean-Leckenby 

 (Plates CXVI A, B, c) 



Original Description 

 [Leckenby, 1859, pp. 7, 9, 15.] 



" [P. 7.] Fossils of the Kelloway Rock of Yorkshire .... 

 Ammonites Vertumnus, Bean, MS. 



" [P- 9] °- Ammonites Vertumnus, Leckenby (Bean MS) PL 1. figs. 3a, 3b. 



"This Ammonite appears to approach most closely to Am. Maria, 

 D'Orb. ; the ribs are strong and cord-like, forming coarse folds on the 

 back. 



" Locality. Near Gristhorpe Bay. 



" [P. 15] Plate 1. Fig. 3a. Am. Vertumnus, Leckenby [Bean, MS.) ; 

 nat. size. 3b. Outline of front view." 



Remarks 



There are five specimens in the Sedgwick Museum, Cambridge, 

 (Leckenby Coll.), under the name Am. vertumnus — the Holotype and 

 4 Paratypes. Of these, two are separable as another species already 

 named, and one is parted as requiring a name. 

 Proportions : — 



I. 32, 33, 4°, 37> Holotype, PL CXVIa. 

 II. 40, 33, 40, 38, Paratype. 

 Subplaty-, pachygyral ; latumbilicate. 

 Conch, serpenticone ; periphery, 2 ; ornament, 4, strong. 

 Genus, Vertumniceras, nov., p. xiv, Genotype, PL CXVIa ; family, 

 Cadoceratidse, Hyatt, 1900. 



Geological position : from Leckenby 's Kelloway Rock, from a grey 

 calcareous bed with a few fairly large oolitic grains — Vertumnus zone 

 (S. Buckman, 1913, 153). 



Result 



Vertumniceras vertumnus, Bean-Leckenby sp. 1859, Divesian, 

 vertumnus zone, near Gristhorpe Bay, near Scarborough, Yorkshire. 



Note. 

 Two Paratypes (Quenst. Damoni, Nikitin, Mem. Soc. Beige GeoL, 

 1889, III, Mem. p. 35, Damon's cited fig. should be lectotype, from name) 

 same matrix as above : Proportions, 41, 41, 41, 32, of the example 

 in Plate CXVIb. A third Paratype with wide-spaced ribs Vertumniceras 

 SPATIATUM nov. PL CXVIc) : Proportions, 50, 35, 38, 40 • 

 matrix more marly and bluish, otherwise similar. 



