NORTH AMERICAN EARLY TERTIARY BRYOZOA. 431 



CYCLOCOLPOSA, new genus. 



The apertura is suborbicular, or elliptical, without cardelles. The frontal is 

 an olocyst, perforated by a double row of areolar pores and covered by a granular 

 detachable pletirocyst. The ovicell is hyperstomial, never closed by the operculum, 

 embedded in the distal zooecium. 



Genotype. Cyclocolposa ptrfomta, new species. 



Kange. Miocene-Pliocene. 



In spite of appearances this genus is very different from Cyclicopora Hincks, 

 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. Tn 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. Cycloperidla rubra, new species. 



Range. Miocene-Pliocene. 



This genus offers the same frontal and apertural characters as Cyclicopora 

 Hincks, 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 Bryozoa 

 of North America. 



"viiiily 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 by 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, lyriila, 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 peristomo with spines. It possesses the same imbedded ovi- 



