724 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
A-D. Mecynoecia delicatula Busk, 1875. A. Fragment of zoarium, X 25, showing the elon- 
gated ovicell with transverse oeciostome. B. View of the embryo, X 270. C. Section of the ovi- 
cell containing embryos, X 85. P. Section of the surface pore tubes, X 330. The exterior mem- 
brane ( m ) is the ectocyst. (A-D after Waters, 1914.) 
E. Mecynoecia soror Pocta, 1892. Longitudinal section through the ovicelli, X 13. 
Fig. 237. — Genus Mecynoecia Canu, 1918. 
A, B. Two ovicelled specimens of Mecynoecia delicatula Busk, 1875. (After Smitt, 1872.) 
Oo° 0 0' 
