22 
THEONOID^. 
UNREPRESENTED SPECIES. 
1. dilatata (d’Orbigny), 1853. 
Syn. Serietubigera dilatata, d’Orbigny, 1853. Bry. Cret. p. 771, pi. 753, 
figs. 8-10. 
Char. — Zoarium irregular in shape ; rising from a pointed base ; expanding 
above with three rays, from which the vertical ridges project widely. 
Apertures biserial. 
Distrib. — Senonian — Campanian : Meudon. 
2. francqana (d’Orbigny), 1853. 
Syn. Serietubigera francqana, d’Orhigny, 1853. Bry. Cret. p. 771, pi. 753, 
figs. 3-7. 
Char. — Zoarium regular, clavate ; ridges project widely. Apertures biserial. 
Distrib. — Senonian — Campanian : Meudon. 
3. hennigi, Pergens, 1894. 
Syn. Comtubigera hennigi, Pergens, 1894. Nouv. Bry. Cret. Limb. : Bull. 
Soc. beige Geol. vol. vii., Mem. p. 175, pi. ix. 
fig. 2. 
Char. — Zoarium funnel-shaped ; a conical hollow in the upper surface ; a series 
of about twenty vertical radial plates projects from the upper part of the outer 
surface of the zoarium. The apertures open on the upper edge of these pro- 
jections ; the apertures are usually in uniserial rows, hut sometimes biserial, 
and on some projections apparently multiserial. Peduncle marked by radial 
oblique ridges, and all covered by an imperforate lamina. 
Distrib.— Senonian — Maastrichtian : Petit-Lanaye, near Maastricht. 
Aff. — M. Pergens remarks its resemblance to an irregular Apsendesia, but 
separates it from that genus by its “ considerable number ” of radial plates, the 
uniserial or biserial arrangement of the apertures, and especially owing to the 
occurrence of an “ ooecium ” in the hollow cone of one specimen. 
The species seems to differ markedly from the type species of Comtubigera, 
which consists of a solid obconic zoarium, with the apertures arranged over the 
sides of the zoarium instead of on projecting Theonoid ridges. It is a very 
close ally of Serietubigera francqana, d’Orb.,^ also from the Campanian zone of 
the French Chalk at Meudon. The two species agree in their obconic form, 
the presence of a conical depression on the upper surface, and the apertures 
opening along the edges of often biserial ridges ; but they differ by the fact 
that in S. francqana the apertures open on the sides as well as on the upper 
edge of the ridges. 
D’Orhigny. Bry. Cret. p. 771, pi. 753, figs. 3-7. 
