106b YORKSHIRE TYPE AMMONITES— II June 



106. AMMONITES OVATULUS, Simpson 

 (Plate CVI) 



Original Description 

 " 124. A[mmonites] ovatulus. [M. Simpson, 1855, p. 76.] 



[" II. With a keel on the back. 

 " a. Outer whorl broad." p. 72.] 



" Nearly the same characters [as A. ovatus, Y. & B.], but the outer 

 whorl much broader. It cannot be the young of the last [A. ovatus], 

 as it occurs in a bed lower in the series, along with A. elegant ulus ; 

 diameter ij inch." 



Additional Details 



Simpson, 1884, 112, adds " U.L., 7." 



Remarks 



Proportions, 34, 46, 27, 24 ; perplaty-, subpachygyral, sub- 

 angustumbilicate. 



Stages, conch, platycone ; periphery 3 (3c ?) ; ornament, 3c. 



Sides of whorls slightly gibbous, thickest about the middle ; carina 

 hollow, sharp, elevated, defined, with signs of accompanying ventral 

 depressions. Inner margin sloping, subconcave. Ornament obscure 

 subcostae. 



The specimen is poor, and the middle is not exposed. 



Genus, Elegantuliceras (II, viii) ; family Hildoceratidae. 



Result 



Elegantuliceras ovatulum, Simpson sp. 1855, Whitbian, exaratum 

 zone [near Whitby]. 





