Anatomy.
Supraanal opening probably separated from the anal by a short mantle-connection, but in all my specimens this is torn by rough handling. Inner lamina of inner gills free from abdominal sac. All four gills marsupial in the female. Placentae well developed and subcylindrical.
Anal opening with small papillae, branchial opening with well developed papillae. Palpi as usual, their posterior margins connected for about one third of their length or less.
As to the color of the soft parts, which is so characteristic in barnesiana, not much can be said, since my material has been too long in alcohol. But in most of my specimens the gills are yet distinctly suffused with black. The placentae have been rendered whitish, but here and there traces of a dark stain are preserved (which is disappearing gradually). It is quite possible that the color of the placentae originally was similar to that of barnesiana.
The glochidia are subelliptical, slightly higher than long; L. O. 15, B. O. 18, thus agreeing with those of F. barnesiana.