272 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
EXPLANATION OF THE FIGURE ON PRECEDING PAGE. 
Fie. 1.—Embryo in the mulberry stage of development, enlarged 250 times. 
Fig. 2.—Embryo in the condition of the first cleavage, showing the nuclei and nucleoli 
of its cells distinctly and an egg membrane, 250 diameters. 
Fig. 3.—Embryo in mulberry stage of more frequent ovoid form, 250 diameters. 
Fig 4.—Part of a cross-section of the larger branch of the animal, showing the cham- 
bered character of the organism, the membranous septa, the oscular funnels in 
various conditions of extension, and the eggs and embryos in place ; 25 diameters. 
Fig. 5.—The whole animal of Camaraphysema obscura, enlarged 7 times. 
Fic. 6.—A small portion of a cross-section similar to Fig. 4, showing the single layer 
of cells which pave the walls of the chambers, with the embryos in position in one 
of the latter. The striw on the cut edges of the walls of the chambers and the 
peculiar conformation of the oscular funnels are indicated. Enlarged 200 times. 
Fic. 7.—Four of the pavement cells lining the chambers, magnified 900 times, show- 
ing their nuclei distinctly. 
