34b YORKSHIRE TYPE AMMONITES Apr. 



34. AMMONITES FABRICATUS, Simpson 



Original Description 

 " 10. A[mmonites] fabricatus. [M. Simpson, 1855, pp. 37, 38.] 



[" I Without a dorsal keel or furrow. 

 " a No spines." p. 35.] 



" Rather tumid ; inner volutions concealed, outer whorl more than 

 ^ the diameter ; umbihcus large ; radii on the inner part of the whorl 

 broad, flattish, obsolete on the rounded back ; striae [p. 38] numerous, 

 annular, fine, fimbriated ; aperture ovate ; diameter \ inch. 



" Probably from the Jet-rock." 



Simpson, 1884, p. 65, the same. 



Remarks 



Stages, conch, sphaerocone ; periphery, i, towards 2, — there is 

 slight angularity ; ornament 2, — striate with constrictions, the spaces 

 lietween constrictions Simpson calls radii. 



Genus, Phylloceras, Suess, 1865 ; family, Phylloceratidae. 



Result 

 Phylloceras fabricatum, Simpson sp. 1855, Whitbian, exaratum 

 zone, near Whitby. 



