NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
175 
three pairs of lateral and one terminal ; the latter is sometimes divided into two or 
even three small chambers. 
Genotype. — Cauloramphus ( Flustra ) spinifer Johnston. Recent. 
This is the Membranipora echinus group of Waters, which he defines as fol- 
lows: “ Ovicells unknown; avicularia pediculate or articulate.” However, the geno- 
type itself is classed in the Membranipora lineata group with “ ovicell with rib.” 
Genus AMMATOPHORA Norman, 1903. 
1903. Ammatophora Norman, Natural History of East Fir.mark. Annals and Magazine 
Natural History, ser. 7, vol. 12, p. 88. 
Zooecia and ovicell depressed and flattened. Zooecia subovate; a calcareous 
crest occupying about two- 
thirds of the area. Oral 
opening distal end of the 
membranous portion. Walls 
thin, terminating at the ovi- 
cell in a knob. Ovicell en- 
tirely separable from the zoo- 
ecium, resting on the knobs 
just mentioned; of unusual 
and varied form. Surface of 
zoarium with raised nodulous 
processes. No avicularia. No 
dietellae. (Norman.) 
Genotype .- — Ammatophora 
( M embranipora ) nodulosa 
Hincks, 1880. Recent. 
The opercular valve never closes the ovicell. 
Genus MARSSONOPORA Lang, 1914. 
1914. Marssonopora Lang, Cretaceous Cheilostome Polyzoa, Geological Magazine, ser. 6, vol. 
1, p. 438. 
The zoarium is uniserial and incrusting. The zooecia are pyriform; the 
gymnocyst is quite convex. It bears on its caudal portion a small avicularium. 
The opesium is surrounded by large spines. The ovicell is hyperstomial, small, 
globular, and salient; it is closed by a special operculum. (See fig. 35, p. 141.) 
Genotype. — Marssonopora dispersa Hagenow, 1839. Upper Senonian. 
Genus ANTROPORA Norman, 1903. 
1903. Antropova Norman, Natural History of East Einmark, Annals and Magazine Natural 
History, ser. 7. vol. 12, p. 87. 
The cryptocyst is largely displayed all around the opesium. A pair of avicu- 
laria with their pointed mandible directed inward, and transversely situated above 
B 
Fig. 43.— Genus Ammatophora Norman, 1903. 
A-C. Ammatophora nodulosa Hincks, 1880. A. A zooecium 
exhibiting a,n unusual form of the ovicell. B. The younger 
condition of the more usual form. C. The mature condition 
of the same. (A-C after Norman, 1903.) 
