1918 AMMONITES DISSIMILIS 118c 



Note 

 Williamson's Chirotypc above referred to was presented to the 



Museum by the Exors. of A. Milnes Marshall, Prof, of Zoology 1879-1893 

 in succession to Williamson. It is presumably a specimen of the original 

 Williamson coll. (see Am. rotifer, No. 113) temporarily in the hands of 

 Prof. Marshall for teaching purposes : — Information of Mr. J. Wilfrid 

 Jackson, F.G.S, It has a label " Ammonites dissimilis, Williamson MSS. 

 Kelloway Rock; Scarboro'." Proportions, 37, 40, 68, 26. Slightly 

 prorsiradiate primaries about half-length of side regularly bifurcate into 

 feebly curving secondaries, with feeble ventral angularity, lost at end of 

 whorl. Suture-line, Li not so longilobate as holotype, L2 longer. Matrix, 

 grey, hard, calcareous with a few fairly large oolite grains. — Quenstedto- 

 ceras williamsoni, nov., [Divesian, vertumnus zone], Scarborough, 

 Yorkshire— PI. CXVIII b. 



Comparable Species 



Holotype, 76 50 (58?) 23 



T.F. 177(118), 39, [48], 25, — Am. Sutherlandia, (Murch.) J. de 



C. Sowerby, June 1817, 

 dlxiii, 2. 



22 ' [ Am. Sutherlandia ; d'Orbigny 

 *9> J 1848, CLXXVI. 



30, » Cardioceras cf. Mologae ; Lahusen 

 33, \ 1883, iv, 17. 



22, — Am. Lamberti pinguis, Quenstedt 

 1887, xc, 15. 



27, — Quenstedticeras Sutherlandiae ; 



Weissermel 1895, XI, I. 



40 68 26 



28, — Am. Sutherlattdia ; d'Orbigny, 

 1848, clxxvii, 3, 4. 



22, I Cardioceras Goliathum ; Lahusen, 

 28, ] 1883, iv, 18. 



30, — Cadoceras carinatum ; Weissermel, 



1895, XII, 2. 

 22, — Quenstedticeras Sutherlandia ; R. 



Douville, 1912, xi(v), 9. 



