A second species of the genus Endorchis is described—E. mandubé; also new species of the rare genera Monticellia, Amphoteromorphus and Nomimoscolex, viz. Monticellia piracatinga, M. rugosa, Amphoteromorphus parkarmoo, Nomimoscolex piracatinga and N. kaparari.

A new genus Manaosia is created to contain the anomalous species M. braço de moça. Proteocephalus lenha becomes Nomimoscolex lenha.

The species Spatulifer surubim, originally described by me as Peltidocotyle rugosa and later referred to the Amphilaphorchidinae, is now regarded as a species of the Monticelliinae.

The eight known species of the Monticelliinae are all referred to the single genus Monticellia, since, differences in vitellaria distribution not corresponding to differences of scolex form, the only alternative is to create an unnecessary number of genera. The genera Goezeella Fuhrmann and Spatulifer Woodland are thus regarded as superfluous.

“Ephedrocephalus” lobosus is removed from the Ephedrocephalinae (which retains its single species E. microcephalus) and, with the two species of “Amphilaphorchis” recently described by me, is placed in Fuhrmann's genus Rudolphiella, now re-established, in the subfamily Rudolphiellinae, thus replacing the Amphilaphorchidinae.

The complete list of known subfamilies, genera and species of the Proteocephalidae described from the Amazon, amended in accordance with the above conclusions, has been published in my last paper on the subject (Woodland, 1935).