Two mounds

breasts

Preceding references to women's clothing ("in their swisha- wish satins and their taffetaffe tights"), this and the word "hemples" seems to refer to two breasts and nipples.

This reference to breasts and nipples immediately follows images of a woman feeding someone (tending a fire with a bellows and making eggs).

Given the usage of such terms as "mudmound" to refer to Porter's (or HCE's or the dreamer's, or whoever you want to say's) body, lying asleep, I'm tempted to also view this as a reference just to Porter and his wife (or HCE and ALP or whoever's) sleeping bodies, in much the same way as in the end of the book, they are both described (in the four positions of love-making described there). But here, as only a passing reference.