CRI>IXA. 
167 
Char. — Possibly founded on the thin distal ends of branches of Crisina cenomana. 
Distrib. — Daman: Paxoe. Turonian: Martigues. 
2. convexa (d’Orbigny), 1853. 
Syx. Clavituhigera convexa, d’Orbigny, 1853. Bry. Cret. p. 725, pi. 746, 
figs. 12-15. 
Idmonea ,, Pergens, 1890. Revision, p. 346. 
,, ,, Pergens, 1895. Bry. Arche de Leves : Bull. Soc. 
beige Geol. vol. viii. p. 134. 
Clavituhigera angustata, d’Orbigny, 1853. Bry. Cret. p. 726, pi. 746, 
figs. 16-20. 
Idmonea ,, Pergens, 1890. Revision, p. 345. 
Char. — Zoarium short, simple, somewhat clavate, rising from a discoid base. 
The reverse face is convex ; the obverse face is rounded or raised to a sharp 
ridge. 
Apertures in series of from three to seven ; the rows are near together, and 
reach to the middle line of the obverse face. 
Distrib. — Senonian (and ? Turonian) : France. 
3. fischeri (Pergens), 1890. 
Syx. Clavituhigera excavata, d’Orbigny, 1853. Bry. Cret. p. 727, pi. 747, 
figs. 6-9. 
,, ,, Staring. 1860. Bod. 17ederl. vol. ii. p. 398. 
Idmonea ,, Hamm, 1881. Bry. mastr. Ob. -Sen. p. 31. 
,, Jischeri, Pergens, 1890. Revision, p. 345, pi. xii. fig. 4. 
,, ,, Pergens, 1890. Br-y. Arche de Leves : Bull. Soc. 
beige Geol. vol. viii., Proc. Verb. p. 134. 
Char. — Allied to Tervia depressa, but laterally compressed; branches thicker 
than wide ; six apertures in each transverse series. 
Distrib. — Senonian — Maastrichtian : Meudon ; Ciply ; Maastricht. 
Santonian : Arche de Leves. 
Coniacian: Vendome, Lisle. 
Turonian : Lavardin and Villavard. 
4. navicularis (Beissel), 1865. 
Syn. Clavituhigera navicularis, Beissel, 1865. Bry. Aach. Kr. : Nat. Verb. 
Holl. Maat. Wet. ser. 2, vol. xxii. p. 73, pi. viii. 
figs. 94-96. 
Char. — Zoarium short, thick, with a broad, concave reverse face. The apertures 
in the lateral series vary from three to five ; the rows are almost vertical, 
and their inner ends are separated by a broad, median band. 
Distrib. — Senonian : Friedrichberg, near Aachen. 
