VOL. XVI. (I) BUCKMAN— GENUS C/NCTA 53 
Locality -—Somerset, Radstock ; Mr Tutcher’s collec- 
tion. 
12 CINCTA ORBICULARIS (Schiibler in Zzeten), 
PIV, figs. 21-24. 
Tad. TZieten, Verst. Wirtt., 1832, p. 52 (Zerebratula 
orbicularis, Schibler) 
Top alae Pleaskin, Bes 4. 
Tl. ‘*Gamelshausen and Pliensbach.” 
Hor. ‘‘ Lias marls.” 
Syn. 1862. Terebratula (Waldheimia) numismalis ; Eudes-Des- 
longchamps, Pal. frang. ; Ter. Jur. Brach., Pl. xiii, 
fig. 4 only. 
Syn.? 1851. Terebratula numismalis ; Davidson, Mon. I, Pl. v, 
figs. 6, 7. 
Description :—Broadly elliptical ; thin, margins acute, 
anterior margin produced and rounded. Apical angle 
about 113. 
Remarks -—This form is distinct by retaining the len- 
ticular stage so long; it shews no truncate anterior margin. 
In Zieten’s figure the anterior margin is rounded ; and the 
only other species of Czzcéa at present noted which shews 
the same rounded margin at such size is C. guadrans. 
This, however, differs entirely in shape. 
Localities and Strata :-—Somerset, Welton, near Rad- 
stock [ Jamzesonz-zone], Mr Marshall’s collection. Exposure 
near Radstock, Mr Richardson’s collection. A fine speci- 
men from Middle Lias, Cote d’Or, France, in Mr Marshall’s 
collection. 
13. CINCTA QUADRANS, sf. z., Pl. VI, figs. 17, 18. 
Description: — Almost diamond-shaped ;_ thin, but 
middle of valves somewhat swollen, almost longitudinally 
carinate ; margins acute, front margin narrow, barely trun- 
cate. Apical angle about 90. 
_ Distinction :—The shape distinguishes it from any 
other species: the nearest is C. ds, which, however, has 
an excavate, bilobate front, and anterior median flattening. 
