VOL. XV. (3) | BUCKMAN—LIAS AMMONITES 235 
Description of “Species. 
I Group of S. angulata (Schlotheim) 
I. SCHLOTHEIMIA STRICKLANDI, sp. n., Pl. XI, f. 5, 6. 
Description :—W horls narrow, much compressed, inclu- 
sion very little. Ribs at first small, numerous, approxi- 
mate, later few, distant, subprominent. Umbilicus wide, 
flat. Periphery narrow, subacutely rounded, ribs mostly 
obsolescent thereon, but a few cross it at intervals. 
Remarks :—Is like A. prometheus, Reynés, but has far 
fewer coils in the umbilicus. 
The specimen which forms part of the Strickland 
collection in the Sedgwick Museum, Cambridge, is labelled 
“Cracombe.” That is near Evesham, Worcestershire, 
and the horizon would be Lower Lias, (Hettangian) ; 
angulatus-zone probably. 
2. SCHLOTHEIMIA ACUTICOSTA (Strickland-Buck- 
man).* PI. XI, f. 1, 2. 
T.d. 1844, J. Buckman, Geol. Chelt., Ed. ii, p. 103. 
Tf. None. 
T/.  Coltknap Hill, near Evesham. 
Hor. ([Hettangian, angulatus-zone ? | 
The following is the original description :— 
“ Ammonttes acuticosta (Strickland)—Back with a single 
furrow, which in the young shell is somewhat broad and 
flat, in older shells nearly obsolete. Volutions 4 or 5, 
compressed, almost wholly exposed, the sides with numer- 
ous regular, simple, very acute ribs, commencing at the 
inner margin of the whorl, curving forwards, gradually at 
first, and more so as they approach the dorsal furrow, 
where they are met, with great regularity, by correspond- 
ing ribs on-the opposite side, exhibiting a sagittate or 
“herring-bone” figure. In large specimens, the ribs on 
1, I suggest this plan to shew the giver of the name and the first describer of the 
species. It indicates Strickland MS. described by Buckman. 
