DISCOSPAESA. 
143 
F TGUEES. 
Fig. 9a, p. 142. Upper surface of a zoariiim, X 15 dia. 
Fig. 9b. The under surface of a younger zoarium, X 15 dia. 
Foth from Middle Chalk : Chatham. Gamble Coll. D. 4256. 
Affinities. 
Xo species having been selected by any previous palaeontologist 
as the type of the genus, this species may he conveniently chosen. 
LIST OF SPECIMENS. 
D. 4256. Two zoaria (on slide). Middle Chalk. Chatham. Gamble Coll. 
Figd. No. 9, p. 142. 
D. 4255. Two zoaria (on shde). Middle Chalk. Chatham. Gamble Coll. 
UNREPEESENTED AND DOUBTFUL SPECIES. 
1. clypeiformis, d’Orhigny, 1853. 
Syx. Discosparsa clypeiformis, d’Orbigny, 1853-4. Bry. Cret. p. 824, pi. 758, 
figs. 6-9. 
,, ,, Pergens, 1890. Revision, p. 337. 
,, ,, Pergens. 1894. Bry. Arche de Leves : Bull. 
Soc. beige Geol. vol. viii., Proc. verb. p. 132. 
Char. — Zoarium large : base concave, with rudimentary basal attachment. 
Zooecia slender, with high peristomes. 
Distrib. — Senonian — Santonian : Saintes and Pecine, Charente-Inferieure. 
Coniacian: Tours and Joue, Indre-et-Loire ; PViUedieu, 
Cher-et-Loir. 
Turonian or Coniacian : Les Roches and Arche de Leves. 
Turonian : Yendome, Cher-et-Loir. 
2. cupula, d’Orhigny, 1853. 
Syx. Discosparsa cupula, d’Orbigny, 1853-4. Bry. Cret. p. 822, pi. 758, 
figs. 1-5. 
,, ,, Pergens, 1890. Revision, p. 337. 
Char.— Zoarium funnel-shaped, with deep central depression and thick margin 
of young zooecia. Zooecia slender. 
Distrib. — Turonian : Angouleme, Charente. 
3. laminosa, d’Orbigny, 1853. 
Syh. Discosparsa laminosa, d’Orbigny, 1853-4. Bry. Cret. p. 822, pi. 757, 
figs. 11-15. 
,, ,, Pergens, 1890. Revision, p. 337. 
Char. — Zoarium funnel-shaped, with broadly open central depression ; zoarium 
thin. Zooecia slender ; apertures irregularly arranged. 
Distrib. — Cenomanian : Le Mans, Sarthe. 
