272 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



EXPLANATION OF THE FIGURE ON PRECEDING PAGE. 



Fig. 1 . — Embryo in the mulberry stage of development, enlarged 250 times. 



Fig. 2. — Embryo in tire 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 br.anch 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 embi-yos in place; 25 diameters. 



Fig. 5. — The whole auimal of Camaraphyscma ohscura, enlarged 7 times. 



Fig. 6. — A small portion of a cross-section similar to Fig. 4, showing the single layer 

 of cells which pave tho walls of the chambers, with the embryos in position in one 

 of the latter. The stria) on the cut edges of the walls of the chambers and the 

 peculiar conformation of the oscular funnels are indicated. Enlarged 200 times. 



Fig. 7. — Foxir of the pavement cells liuing the chambers, magnified 900 times, show- 

 ing their nuclei distinctly. 



