1858.] LECKENBY KELLOWAY FOSSILS, YORKSHIEE. 11 



nulated back or keel. Aperture elliptical, two-thirds indented by 

 the succeeding whorl. 



Locality. The Castle Kock, Scarborough. 



18. Ammonites flexicostatus, Phillips. 

 Localities. Throughout the entire range. 



19. Ammonites Lamberti, Sowerby. 

 Ammonites longcevus, Bean, MS. 

 This Ammonite approaches Am. Jlexicostatus, but in jleocicostatus 

 there are two or three smaller ribs between each principal one ; 

 whereas, in Am. Lamberti, they simply bifurcate, and are much 

 less incurved than in the former species. 

 Locality. The Castle Rock, Scarborough. 



20. Ammonttes putealis, Leckenby (Bean, MS.). PI. II. fig. SaSc. 



Discoid ; whorls rounded near the umbilical margin, flatter in the 

 middle, and again rounded towards the keel ; ribs prominent, ob- 

 tuse, occasionally bifurcate, shghtly undulating, and finally bend- 

 ing towards the aperture, where they become enlarged, but do not 

 pass over the back ; keel prominent. Aperture indented ^th by the 

 succeeding whorl. 



Locality. The Castle Rock, Scarborough. 



21. Ammonites turgidus. Bean, MS. 



This is not a satisfactory species; the outer whorl is entirely 

 devoid of ornamentation, and may probably be the adult stage of 

 the preceding, or some other species. Without an examination of 

 the inner whorls the question cannot be decided. 



Locality. The Castle Rock, Scarborough. 



22. Ammoketes gregaeitis (?), Bean, MS. 



Except in its greater comparative thickness, which renders the 

 umbilicus deeper, and the somewhat more robust character of the 

 ribs, I cannot distinguish this from Am. fleccicostatus. 



Locality. South side of the Castle Rock, Scarborough. 



23. Ammonites Lunula, Zieten. 



This species, which is not uncommon, agrees so well with the 

 description and figures of D'Orbigny, as to leave no doubt of its 

 identity. 



Locality. North side of Scarborough Castle Rock. 



24. Ammonites Chamusseti, D'Orbigny. 

 Ammonites lenticuluris, Phillips. 

 Locality. Red Cliff only. 



25. Ammonites funiferus, Phillips. 



This is a much more depressed species than Am. Chamusseti, 

 and the intricate character of the foliations of the septa also distin- 

 guish it. 



Locality. Red Cliff only. 



