NORTH AMERICAN EARLY TERTIARY BKYO/OA. 



48 



FIG. 1. General Anatomy of tlie Cheilostomata. 



A. B. Structure of a corneous cheilustomafous bryozoan, Bugulu lurliinata Alclen. from the 

 Atlantic at Plymouth, England. 



A. A small copy or zoariimi, natural size. 



B. Portion nf a branch. X 50. show-in!,' rhe zooifl or polypirte in various positions in the 

 /.ooecium. a, <>', avicularia in different positions; up, aperture of the zooecium covered by a 

 membrane; b. polypide bud attached to 6h, the brown body the degenerated remains of an old 

 polypide: HI, nmuth surrounded by the circle of tentacles; two individuals show the tentacles 

 partly expanded: o, ovicell ; s. marginal spines. In this figure the avicularia of sunn- of the 

 zooecia have I n omitted. I A. B. After Harnier, 1896.) 



C. Two zuoids of the common bryozoaii called the "Bird's Head Coralline" iltiiiiiiln avicu- 

 laria Linnaeus i. highly magnified. (After Parker and Haswell, 1910, with corrections.) 



an, anus; urn-, avicularia; enib, embryo enclosed in the ovicell (ooecium) ; coec, coecum; 

 funic, funiculus; int, intestine: mo. mouth; oes, esophagus; ooec, ooecium (ovicell); or, 

 ovary ; i>h, pharynx : ret. large retractor muscles of polypide : xp, spermatidia : tent, Tentacles. 



The ganglion which is not indicated, lies just below the middle of the stroke from mo. 



