85b 



YORKSHIRE TYPE AMMONITES— II 



Nov. 



85. AMMONITES PHILLIPSI, 

 (Plate LXXXV) 



Simpson, 



Original Description 

 66. — Afmmonites] Phillipsi. [M. Simpson, 1843, pp. 36, 37.] 



[" II. With a keel on the back. . 

 " a Outer whorl broad." p. 31.] 



" Depressed, inner volutions much concealed, outer whorl f the 

 diameter, thin near the back, thick at the inner margin, which is irregular 

 with tubercles or swellings ; radii unequal, nearly straight, then [p. 37] 

 bend towards the aperture ; keel sharp, prominent, entire ; aperture 

 triangular ; diameter 2\ inches. 



" This is, at present, a rare species, and I am unacquainted with its 

 locality, but I have no doubt of its being from the upper lias. In naming 

 this species, I have much gratification in recording the name of Professor 

 John Phillips, whose career as a geologist, I believe, commenced with 

 an investigation of the fossils of the Yorkshire Coast, and to whose work 

 I have the pleasure of making frequent reference." 



Additional Details 

 I 855, 78, omits " depressed " and last sentence ; 1884, 



Simpson 

 113, the same as 1855, but adds 



U.L., 1, Peak. 



Remarks 

 24, 29 



(without carina) ; platy- 



5*. 



Proportions : 64, 42, 

 subleptogyral ; sublatumbilicate. 



Stages, conch, platycone ; periphery, 3c ; ornament, 



The septicarina is thin, but moderately high. There is a slight 

 flexure of the ribs, and some irregularity of ornament : these characters 

 bring it near to the series I, B, B or C (S. Buckman, Mon. p. xi) and 

 so to genus Phymatoceras, Hyatt, 1867 (S. Buckman, Mon. p. xxx). 



Geological position, presumably just below the striatulus shales. 



Result 

 Phymatoceras phillipsi, Simpson sp. 1843, Whitbian, [variabilis 

 zone], Peak, near Whitby. 



