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 operculum must be introduced into a new genus.” Our manuscript was 
written in 1917. In 1918 Waters 7 stated that the operculum of Cheilopora cir- 
cumcincta Neviani, 1896, is quite different from the operculum of the genotype 
Cheilopora 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 ( Cheilopora) haddoni Hamer, 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: 
Cheilopora labiosa Ulrich, 1901; Cheilopora orbifera; C. prelucidioides; C. stricto- 
cella; C. grandis; C. transversa; C. transveroides; C. specula; and C. sulcifera Canu 
and Bassler. 
j on some Mediterranean Bryozoa, Annals and Magazine Natural History, ser. 9, vol. 11, p. 97, pi. 12, figs. 6-10. 
12184—23—BuU. 125-12 
