NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 



169 



Historical. — In our monograph on the Early Tertiary Bryozoa we noted: "The 

 genotype is deprived of cardelles. We think that the species having cardelles and a 

 different opercukim must be introduced into a new genus." Our manuscript was 

 written in 1917. In 1918 Waters ' stated that the operculum of CTieilopora cir- 

 cumcincta Neviani, 1896, is quite different from the operculum of the genotype 

 CheiJopora sincera Smitt, 1867, and that these two species can not be maintained in 

 the same genus. Under these conditions we are justified in creating the new genus 

 Cheiloporina. 



Fio. 31. — Cheiloporina, new genus. 



A-H. Cheiloporina {Chdlopora)haddoni'BaTmeT, 1902. A. Two zooecia, one ovicelled, showing an 

 avicularium (a) and the two kinds of opercula. B. Basal view of zooecium with trifoliate operculum. 

 (After Harmer, 1902), op. operculum; t, tentacles; o, ovary; ov, ovisac. C. Zoarium with ovicelled 

 zooecia, X 25. (After Jullien, 1903.) D. Ovicelled zooecia, X 12. E. Operculum of ordinary zooe- 

 cium, X 85. F. Operculum of ovicelled zooecia, X 85. G. Lateral wall showing septulae. H. Distal 

 wall with septulae. (D-H, after Waters, 1918.) 



All the species of Cheilopora described in the Monograph of North American 

 Early Tertiary Bryozoa belong in reality to Cheiloporina. These are as follows: 

 CTieilopora labiosa Ulrich, 1901; Cheilopora orbifera; C. prelucidioides; C. stricto- 

 cella; C. grandis; C. transversa; C. transveroiies; C. specula; and C. sulcifera Canu 

 and Bassler. 



' On some Mediterranean Bryozoa, Annals and Magazine Natural History, ser. 9, vol. 11, p. 97, pi. 12, flgs. 6-10. 

 12184— 23— BuU. 125 12 



