VOL. xvi. (1) | BUCKMAN—GENUS C/WCTA 55 
Description :—¥Flongately subovate, somewhat stout, 
subgibbous ; anterior median portion of both valves flat- 
tened, then excavate; anterior margin excavate, bilobate, 
and slightly thickened ; two diverging subcarine run down 
each valve to the two lobes. Apical angle about 103. 
Distinction -—From C. dives, narrower, more elongate, 
and not so stout. 
Remarks :—The example figured by Davidson (loc. 
cit.) is in the Davidson collection, British Museum, No. 
B 5175. Davidson’s fig. 9 is not broad enough, nor 
angulate enough, the posterior slope should be more pro- 
nounced. His fig. 9* brings out these characters more 
correctly. 
Localities and Strata :—Somerset, Radstock ; several 
examples in Mr Tutcher’s, Mr Marshall’s, Mr Richardson’s 
and my own collections, and all from exposures near the 
town. Gloucestershire: “Am. /amesont-zone, lowest 
portion of Middle Lias, near Cheltenham,” Davidson, 
B5175, British Museum, Davidson collection. Bishop’s 
Cleeve and Gloucester Gas Works, Mr Richardson’s col- 
lection. Normandy, British Museum, No. 34399”. 
16. CINCTA OPULENTA, sf. z., Pl. VI, figs. 15, 16. 
1858, Terebratuia numismalis ; Quenstedt, Jura, PI. xvii, 
figs. 37, 38, 40. 
1878. Waldheimia numismalis ; Davidson, Ool. and Lias 
Brach. (Pal. Soc.) Suppl. Pl. xxi, fig. 8. 
Description -—Elliptical, gibbous, stout; “margins sub- 
acute; anterior median third of valves excavate, front 
margin excavate. Apical angle about 92. 
Distinction :—Is similar in proportions to the specimen 
identified as C. conocolZzs (Rau), but is more acuminate 
posteriorly, and has marked anterior excavation in both 
valves. Has a narrower apical angle, is more gibbous, and 
is bilobate at a smaller size than C. as. 
