Plate 10. 

 Fig. 1. TiijpoalKjii rcnusta Xorman, l-;(i4. (p. 95.) 



A Miocene example of this widely distributed specie.?, X 20. 



Miocene (Duplin marl): Wilmington, North Carolina. 

 Fig. 2. Lacerna miirronala Smitt, 1872. (p. 9.9.) 



A fossil, incrustiiio; example X 20, referred to this recent species. 



Miocene (Duplin marl): Wilmington, North Carolina. 

 Fig. 3. Arthropoma cornuta, new species, (p. 97.) 



The incrusting zoarium, X 20, showing the characteristic sinus and the fmnfal iirotulerance. 



Miocene (Choctawhatchee marl): ,Iac! .son Bhiff, Ocklocknee River, 25 miles southwest of Talla- 

 hassee, Florida. 

 Figs. 4-9. Stephanosella biapcrta Michclin, 1S42. (p. 99.) 



4. The incrusting zoarium, X 20, illustrating the triangular avicularia. 



5. A zoari\mi, X 20, with more rounded avicularia. The tremocyst is detachallo from the sub- 

 jacent olocyst. 



<i. Interior of the zooecia X 20, illustrating the form of the ajiertura. 

 Pleistocene; Rustic Canyon, Santa Monica, California. 



7. An example, X 20, containing both round and triangular avicidaria. 

 Pleistocene: Los Angeles, California. 



8. Surface, X 20, showing several ovicelled zooecia. 

 Pleistocene: Vero, Florida. 



9. A zoarium X 20 showing the aneestrular zooecia and the thinness of the zooecial walls. The 

 dietellae are very narrow. 



Pleistocene: Dead Man's Island off San Pedro, California. 

 Fig. 10. Srhizopordta nimuhiln Ulrich and Bassler. 1904. (p. fC.) 



View of the type specimen, X 20, shoA\ing the irregular ariaugement and the piling uj) of tl:e 

 zooecia. 



Miocene (Choptank formation): .Tones Wharf. Maryland. 

 Figs. 11-15. Schizopodrella Jloridiiia Osburn, 1914. (p. 10(j.) 



11. A zoarium, natural size, composed of many lamellae. 



12. Non oriented aneestrular zooecia, 'X 20. 



. 13. Normal aspect of the zooecia, X 20. One zooecium lia:< been regenerated with an avicularium 

 occupying the apertura. 



14. .V transverse section through a mullilamcllar zoarium, X 20. 



Miocene (Choctawhatchee marl): .Jackson Bluff, Ocklocknee River, 25 miles southwest of Talla- 

 hassee, Florida. 



15. Zooecia X 20, showing the form of the ajierlura more clearly. Several of the apertures are 

 closed. 



Miocene (Duplin marli: Wilniington. North Carolina. 



2c0 



