46 PROCEEDINGS COTTESWOLD CLUB — 1907 
or imperfect specimens, or for general purposes. These 
series are as follow: 
a C.cor-series. C. cor, C. causoniana. 
b CC. nummosa-series—the discoids—C. pernummus, 
nummus, nummosa, nummata. 
c C. numtsmalis-series —thin bilobates —C. fer- 
numismalis, numismales, obolus. 
d C. dives-series—stout forms—C. dives, pinguzs, 
conocollts. 
eC. orbicularis-series — non-excavates — C. orbicu- 
laris, gquadrans, paupercula. 
f C. dis-series—stout bilobates—C. avs, opulenta, 
sestertius. 
C. pauper-series — dwarfs — C. tops, pauper, 
musera. 
Horizons of Species.—Cincta cor. is a species of the 
Sinemurian. Deslongchamps (Pal, frang. Brach. p. 82) 
says that it occupies a constant position where Gryphea 
arcuata ends and Gryphea cymbium begins—the last bed 
of d’Orbigny’s Sinemurian: that is presumably odtusus or 
oxynotus-zone. All the other species now to be described 
occur in the lower part of the Pliensbachian, mostly, so far 
as the evidence goes, in the /amesont-zone. A few of 
Mr Tutcher’s specimens are marked “ avmaztus-zone.” 
gg 
A. Forms depicted i the Plates. 
1. CINCTA COR (Valenciennes), Pl. VI, figs. 11, 12. 
7.d. Valenciennes in Lamarck’s Anim. sans Vert. 1819, 
VI, p. 250. (Zerebratula cor.) 
T.f. Davidson, Lamarck’s species ; Ann. Mag. Nat. Hist. 
(2) V, Pl. xv, fig. 22 (1850), (Zer. cor.) 
T.1. ‘© Vieux Pont, Normandy,” (Davidson.) 
Remarks -—The peculiar cordate shape of this species, 
with its greatest width towards the anterior part, separates 
it at once from any other forms dealt with in this paper. . 
