206 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 74. — Genus Scrupocellaria Van Beneden, 1845 



A-F. Scrupocellaria scruposa Linnaeus, 1758. A. Posterior face of a fragment, 

 X33.5. B. Anterior face, X33.5. C. Group of ovicelled zooecia. D, E. Lat- 

 eral avicularium, X 61, and its mandible, X 106. F. Frontal avicularium, X175. 

 (A-F. After Levinsen, 1894.) 



G. Scrupocellaria jalloisi Savigny-Audouin, 1826. Dorsal surface, to show the 

 articulation. (After Waters, 1913.) 



H-K. Scrupocellaria ferox Busk, 1852. H. Dorsal surface showing articula- 

 tion. I. A mandible of an anterior (large) and of a lateral (small) avicularium, 

 X85. J. Base of vibracular seta. (H-J. After Waters, 1913.) K. Diagram of 

 bifurcation. The joint traverses the opesia (dotted lines) of the outer zooecia. 

 (After Harmer, 1923.) L, M. Scrupocellaria antarctica Waters, 1904. L. Man- 

 dible of lateral avicularium, X85. M. Mandible of median avicularium, X250. 

 (L, M. After Waters, 1904.) 



N-U. Scrupocellaria macandrei Busk, 1852. N. Separable operculum, X250, 

 a unique case in this genus. O. Smooth seta of the vibraculum, X85. P. Base 

 of seta with several irregular projections, X250. Q. Mandible of lateral avicu- 

 larium, X 250. R. Mandible of anterior (axial) avicularium, X 250. S. Vibracu- 

 larian chamber decalcified, X250. T. Base of seta with muscles and lateral 

 chitin pieces (ch), X250. U- Lateral avicularium, X100. (N-U. After Waters, 

 1918.) 



