NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
431 
CYCLOCOLPOSA, new genu*. 
The apertura is suborbicular, or elliptical, without carclelles. The frontal is 
an olocyst, perforated by a double row of areolar pores and covered by a granular 
detachable pleurocyst. The ovicell is hyperstomial, never closed by the operculum, 
embedded in the distal zooecium. 
Genotype. — Cyclocolposa perforata , new species. 
Range. — Miocene-Pliocene. 
In spite of appearances this genus is very different from Cyclicopora Hindis, 
1884. The frontal pores are really areolar pores, and not tremopores, for they are 
separated by short costules; the granulations reveal also the detachable pleurocyst, 
moreover, and are often visible on the altered zooecia. In Cyclicopora the oper- 
culum always closes the ovicell to assure the passage of the eggs. Here this func- 
tion is assured by the embedding of the ovicell in the distal zooecium, and in the 
great thickness of the frontal. The orifice is thus arranged in the locella in front 
of the tentacular sheath. 
The description of the type species is reserved for a later publication. 
CYCLOPERIELLA, new genus. 
Greek: Peri , around. In allusion to the form of the ovicell. 
The ovicell is hyperstomial, globular, not embedded in the distal zooecium, 
and entirely covers the apertura. The apertura is formed of a semilunar anter 
and of a very concave poster. The frontal is formed of a very thin olocyst sup- 
porting a tremocyst with large widened pores. 
Genotype. — Cycloperiella rubra , new species. 
Range. — Miocene-Pliocene. 
This genus offers the same frontal and apertural characters as Cyclicopora 
Hindis, 1884. It differs from it in its ovicell, never closed by the operculum. 
The passage of the eggs is assured by the form of the ovicell itself, which entirely 
covers the apertura. 
The type species will be described in our volume on the later Tertiary Brvozoa 
of North America. 
w imily STOMACHETOSELLIDAE Canu and Bassler, 1917. 
The frontal is thick and occasions the formation of a peristomie. The apertura 
is generally orbicular or semilunar with a very concave proximal border. The 
peristomice is always different in form; it is notched below bv a rimule-spiramen 
designed to conduct the water into the compensatrix. The ovicell is hyperstomial, 
imbedded in the distal zooecia; it opens above the apertura in the peristomie. No 
peristomie, lyrula, or cardelles. 
This family differs from the Reteporidae in the absence of vibices, vacuoles 
and reticulated zoarium, in the cleft on the ovicell and in the presence of a peri- 
stomie. It resembles this family in its imbedded ovicell and its rimule-spiramen. 
It differs from the Smittinidae in the absence of lyrula, cardelles, median 
avicularium, and of a peristome with spines. It possesses the same imbedded ovi- 
