Plate 11. 



Figs. 1-3. Acanthode.na savarti Audouin, 182G, forma typica. (p. 31.) 



1. An incrustins; specimen X 20, of the typical form of the species, illustrating the considerable 

 micrometric variations. Traces of the spicules in the opesiuni are \isible. 



Miocene: Bowler's wharf, IS miles above Urbana, Middlesex County, Virginia. 



2. An example X 20, with young zooecia. 



3. Surfaceof a free, multilamellar zoarium, X 20, with numerous spicules, in the opesium. 

 Miocene (Yorktown formation): Near Suffolk, Virginia. 



Fig. 4. Acanthodesin snvarti forma bifoliataVlrich and Bassler, 1904. (p. 33.) 



Surface of the bilamellar type zoarium, X 20, showing the thin mural rim, the absence of the cryp- 

 tocyst, the tubercles at the angles and and spicules in the opesium. 



Miocene (Choptank formation): Jones Wharf, Maryland. 

 Figs. 5-9. Acnnthodesia savdrti forma delicatula Busk, 1859. (p. 33.) 



5. An incrusting example, X 20, referred to this form. 

 Miocene: Bowler's wharf, 18 miles above Urbana, Virginia. 



6. Zoarial fragments, natural size. 



7. A branch, X 20, on which the zooecia are developed in opposite directions. 



8. Another branch, X 20, in which the cryptocyst is small and the superficial ornament is ob- 

 scured by fossilization. 



9. A well preserved branch, X 20, sho%ving the unequal development of the cryptocyst. 

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

 hassee. Florida. 



Figs. 10-12. .Vembrendoecium grande, new species, (p. 3fi.) 



10. Portion of the zoarium X 20, with irregular zooecia, one showing the endozooecial o\-icell. 

 Miocene (Duplin marl): Wilmington, North Carolina. 



11. Marginal, elongated zooecia, X 20. 



12. Another portion of the same zoarium X 20, with se\eral ovicelled zooecia. 

 Pliocene (Waccamaw marl): Waccamaw River, Horry County, South Carolina. 



255 



