BUCKMAN : AMMONITES FROM THE SCARBOROUGH LIMESTONE. 207 
5. Stepheoceras cf. zieteni, Quenstedt sp. 
1886, Ammonites humphriesianus zieteni, Quenstedt, Amm. 
Schwab. Jura, PI. LXVI, Fig. 10. 
This specimen, from Mr. Richardson, is only a fragment of\ 
whorl shewing three primary ribs dividing into six secondaries, 
with the knobs of junction somewhat near the inner margin. 
The specimen would have been about 200 to 240 mm. in diameter. 
6. Stepheoceras cf. pyritosum, Quenstedt sp. 
1886, Ammonites humphriesianus pyritosus. Quenstedt, Amm. 
Schwab. Jura, PI. LXVI, Fig. 4. 
One fairly good specimen in the University Museum, Oxford 
(PhiUips Coll.) from Gristhorpe [near Scarborough] about 150 mm. 
in diameter, agrees fairly Avith Quenstedt 's species, but is rather 
more umbilicate. 
Dorsetensia ? spp. 
Three specimens labelled " Cloughton G.O.," and collected 
by Mr. Herries, were submitted by Mr. Richardson. Two are 
only fragments, and the third is much broken, while its umbilicus 
and essential characters are much obscured by matrix : thus 
identifications cannot be satisfactory. 
The specimens are smooth, compressed, degenerate Son- 
nininse with simplified suture-line ; and of the general t} pe of 
smooth Witchellia or Dorsetensia. There is some likeness to 
Dorsetensia romani, Oppel sp.,^ to Witchellia romanoides, Douville 
sp.,- and to Dorsetensia liostraca, S. Buckman.^ As Mr. Herries 
saj's that he collected the specimens from the upper part of the 
Scarborough Limestone, which would not be earlier than hlagdeni 
hemera, and as W . romanoides would indicate an earlier date, 
sauzei hemera, it is likely that the two other species mentioned, 
which are of hlagdeni date, are the more possible identifications. 
One fragment may be tentatively labelled Dorsetensia romani, 
the other is some uncertain species of Dorsetensia, while the more 
1 Pal. Mitth. 1862, PI. XLVI, f. 2. 
2 Bull. Soc. Geol. France (3) XIII, PI. Ill, f. .3, 4, 1884. 
3 Mon. I O. Anmi. (Pal. Soc), 1892, PI. LV, f. 3-5. 
