20 
THEONOID^. 
D. 3311. 
D. 3516. 
D. 3572. 
D. 3719. 
D. 6143. 
D. 6146. 
D. 6344. 
B. 6346. 
B. 3321. 
A tube with twenty zoaria, bases often concave ; wide central areas 
within the ridges. Maastrichter Kalk. Maastricht. Tan Breda Coll. 
A compound zoarium of about five sub-colonies, composed of a group 
of typical A. diadema, each 5 mm. in dia., with a young attached 
zoarium, 1’5 mm. dia. Maastrichter Kalk. Maastricht. Van 
Breda Coll. 
A thin adnate zoarium (on slide). Maastrichter Kalk. Maastricht. 
Van Breda Coll. 
Two zoaria (in tube), labelled by M. Pergens as L'lchenopora diadema. 
Maastrichter Kalk. Maastricht. Gamble Coll. Purchased. 
Two young zoaria with fusiform bundles of zooecia. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
A zoarium of var. michelini, Hag., 4-5 by 4 mra. in dia. and 
l‘5mm. thick ; it has a faint peduncle which has doubtless been 
retained, as the zoarium appears to have grown on some soft body ; 
many of the zoaria in the species show a rudiment of the peduncle, 
but it has been buried in the thickness of the zoarium. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
Three zoaria (on slide), labelled by Busk Lopholepis irregularis, Hag. 
Two are compound varieties of A. diadema, one of these two being 
a very good specimen. The third specimen on the slide is a broken 
tuft probably of this species, but its affinities are more doubtful. 
Maastrichter Kreide. St. Pierre, Maastricht. Busk Coll. Presented 
by Miss Busk, 1899. 
A compound variety with a fragment of Lopholepis alter nans, Hag. (on 
slide), labelled by Busk Lopholepis radians. Hag. Maastrichter 
Kreide. Bemelen. Busk Coll. Presented by Miss Busk. 
Twelve sub-colouies in a continuous sheet ; one of the colonies has the 
ridges rather long. Maastrichter Kalk. Maastricht. Old Coll. 
UNREPHESEiS^TED SPECIES. 
1. discus (d’Orbigny), 1853. 
Syn. TJnitubigera discus, d’Orbigny, 1853. Bry. Cret. p. 760, pi. 763, figs. 4-6. 
Char. — Thin circular zoarium, with thin selvage, and numerous crowded, 
uniserial radii. 
Distrib. — Neocomian : Sainte-Croix, Vaud. 
S. moneta (d’Orbigny), 1853. 
Syn. Biscotuhigera moneta, d’Orbigny, 1853. Bry. Cret. p. 758, pi. 751, 
figs. 8-11. 
Char. — A near ally of A. hrongniarti, but the radii extend to the centre of 
the disc. 
Distrib. — Senonian — Coniacian : Yendome, Loir-et-Cher. 
