THE ANATOMY OF AMPHIPTYCHES URNA. 151 
Fig. 11.—A portion of one of the ovaries of the same specimen as figure 10. The 
nuclei are large and distinct, with well-marked chromatin masses, but the outline of 
cells is scarcely to be distinguished, the mass forming a syncytium. The nuclei have 
the appearance of undergoing division. o. nuclei; sy. mass of protoplasm. 
Fig. 12.—One of the testicular masses, showing the spermatozoa in various 
stages of development in the same mass. The wall is lined by an irregular mass of 
cells (1), from which apparently cells drop off into the cavity and become, by division 
of the nucleus, polynuclear masses (2), from which the spermatozoa are gradually 
developed (8, 4, 5, and 6). 
Fig. 13.—An embryo from the uterus, encased in the shell and provided with a 
circlet of 10 hooks. sh. shell; . hooks ; very numerous nuclei lie close to the outer 
wall, and the inner part is apparently crossed by irregular strands of protoplasm, 
though this may perhaps be the effect of reagents. 
