59b YORKSHIRE TYPE AMMONITES May 



59. AMMONITES FONTICULUS, Simpson 

 (Plate LIX) 



Original Description 

 " 70. Armmonites] fonticulus. fM. Simpson, 1855, pp. 57, 58.] 



[" The following species, to the end of the Section, have all a family 

 resemblance to A. communis : — 



Whorls narrow, exposed, with numerous slender, annular ribs, which 

 generally split in two on the back." p. 50.] 



" Thick ; volutions 7, inner ones nearly J concealed, outer whorl 

 less than J the diameter, sides quickly and regularly rounded ; umbilicus 

 deep ; radii obtuse, split in two or three near the back, on the inner 

 whorls show a row of flatted bases of tubercles. 



" This is a neat shell, of a dark-brown colour. On account of 

 [p. 58] its deep umbiHcus, it would make an excellent little fountain 

 for holding the more precious drops of holy water, gathered from the 

 morning dew, which would possess the greater virtue, as this is one of 

 the snakes turned to stone by Lady Hilda : — 



" ' They told 



how, of thousand snakes, each one 

 Was turned into a coil of stone. 

 When holy Hilda prayed ! '—Sir W. Scott." 



Additional Details 

 Simpson, 1884, 89, adds " U.L." to end of first paragraph ; omits 

 all the second. 



Remarks 



Stages, conch, serpenticone ; periphery, i ; ornament 5* declining. 



The ornament is regular tuberculate up to about 35 mm. diameter ; 

 then intermittent tuberculate ; all with occasional fibulation. Ribs 

 numerous, not strong, septate, mostly bifurcate, occasionally entire, 

 especially in intermittent tuberculate stage. The tuberculate stage 

 shows signs of obsolescence. 



Genus, Coeloceras, Hyatt, (Gen. iv) from proportions and ornament, 

 though the fibulation suggests Porpoceras ; family, Dactyloidae, Hyatt. 

 Geological position : Blake, 1876, 302, says " probably zone of 

 A. serpentinus" ; the matrix suggests Jet Rock. 



Result 



CcELOCERAS FONTicuLUM, SiMPSON sp. 1855, Whitbian, [exaratum 

 zone ? near Whitby.] 



