526 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 217. — Genus Bicrisia D'Orbigny, 1852 

 A-F. Bicrisia edwardsiana D'Orbigny, 1839. A. Colony, natural size. B. 

 Frontal view of several segments. C. Dorsal view showing the mode of ramifica- 

 tion. (A-C. After D'Orbigny, 1839.) D. Another colony, natural size. E. 

 Dorsal view of several segments. F. Frontal view of segments with one ovicell. 

 (After MacGillivray.) 



far 



Fig. 218. — Genus Filicrisia D'Orbigny, 1852 

 A-F. Filicrisia geniculata Milne Edwards, 1838. A. Bush-like colony, natural 

 size. B. Portion of colony, X16. C. Tubes, X48, showing gemmation. D. 

 A tube viewed by transparency, showing the eight ciliated tentacles and the 

 principal anatomical features; a, tentacles furnished with vibratile cilia; 6, 

 stomach; c, intestine, d, anus; e, retractor muscles of the polypide. (A-D. 

 After Milne Edwards, 1838). E. F. Ovicell viewed from the dorsal and frontal 

 (After Harmer, 1891.) 



