ioib YORKSHIRE TYPE AMMONITES— II Mar. 



101. AMMONITES NEGLECTUS, Simpson 

 (Plate CI) 



Original Description 

 " 38. A[mmonites] neglectus. [M. Simpson, 1855, pp. 45, 46.] 



["I. Without a dorsal keel or furrow. 

 a. No spines." p. 35.] 



" Volutions 7 or 8, exposed ; radii prominent, separated by widish 

 concave spaces, slightly bend towards the aperture on the back near 

 [p. 46] an elevated line or imperfect keel ; aperture circular ; diameter 

 if inch. 



" The shell is rough, with a few annular striae. It is more depressed 

 than A. gagateus, which it much resembles. L.L. ; R. H. Bay." 



Simpson, 1884, 76, the same. 



Remarks 



Proportions, 47, 25, 25, 52 substeno-, sublepto-gyral, subextremi- 

 latumbilicate. 



Stages, conch, serpenticone ; periphery, 3 ; ornament, 4. 



The rounded periphery carries slightly v-shaped ribs, their apices 

 connected by a low carina. 



The rib characters of sides of inner whorls are like those of 

 P. finitimum (No. 100). In later whorls the ribs maintain their strong 

 and distant character, and in side view, so far as ribbing goes, the likeness 

 to G. gagateum is considerable : the periphery, however, differs decidedly. 



Genus, Parechioceras, (II, ix) ; family, Echioceratidae (II, v). 



Geological position, presumably L.L. 13 with G. gagateum, for matrix 

 and condition are similar. 



Result 



Parechioceras neglectum, Simpson sp. 1855, [Sinemurian, oxy- 

 notum zone], Robin Hood's Bay, near Whitby. 



