Plate 17. 



Figs. 1-12. Stylopoma spongites Pallas, 17(ifi. (p. 102.) 



I, 2. Two forms of the zoarium, natural size, made up of many lamellae. 

 3, 4. Transverse sections of zoaria, natural size. 



5. Sm-face X 20, showing broad unovicelled zooecia. 



6. Another surface X 20, exhibiting nonoriented zooecia which bear consijicuous avicularla. 



7. Inferior face of a lamella, X 20. 



Miocene (Duplin marl): Wilmington, North (^"arolina. 



8. Normal zooecia with avicularia X 20. Dietellae are not present. The broken ovicell shows 

 the tremocyst resting on the olocyst. 



9. Normal and ovicelled zooecia X 20. The ovicell surrounds and conceals the apcrtura. 



10. Ancestrular portion of a zoarium, X 20. 



II. Zooecial walls X 20, obtained by abrasion of the surface, showing an-angement of the septules. 



12. A portion of a zoarium X 20, with (|uite elongated zooecia. 

 Pliocene (Caloosahatchee marl): Shell Creek, De Soto County, Florida. 



Figs. 13, 14. Schizo podrella unicornis Johnston, 1847. (p. 105.) 



13. Photograph of a well-preserved Miocene specimen, X 20, sho\\ ing the form of the apertura 

 and the avicularia clearly. 



14. Zooecia of the type specimen of SchizoporeUa siiliqiKirlrata Ulrich and Bassler, 1904, now con- 

 sidered as a synonym of S. unicornis. • 



iliocene (Choptank formation): Governor Run, Maryland. 

 Figs. 1.5-17. Ilippaliosina rostrigera Smitt, 1872. (p. 167.) 



15. Zooecia, X 20, of a form exliibiting only one avicularium above the aperture. 

 Miocene (Duplin marl): 1 mile northeast Suffolk, Virginia. 



16. The normal form of the species, X 20, with two avicularia. 



17. Interior of zooecia, X 20, illustrating tlie two cardelles and the olocyst. 

 Pliocene (Caloosahatchee marl): Mom'oe County, Florida. 



Figs. 18-19. Schizo pod reiki pusilla, new species, (p. 106.) 



18. The fi'ee bilamellar zoarium, natural size. 



19. Surface, X 20, showing the small zooecia with large tremopores. 



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

 hassee, Florida. 



261 



