brown bodies

From ZooTerms (Dictionary of Invertebrate Zoology)
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brown bodies: 1. (Annelida: Oligochaeta) Spheroidal, ellipsoidal or discoidal masses, free in the coelomic cavities, containing corpuscles or brown debris, setae, cysts of parasites, nematodes and various other foreign bodies.

2. (Bryozoa) In Stenolaemata and Gymnolaemata, an encapsulated mass of degenerating cells from the lophophore, gut, muscles and other nonskeletal parts of a zooid, retained in the body cavity or expelled after regeneration of feeding and digestive organs. See also brown deposit.

3. (Echinodermata: Holothuroidea) Small clumps of amoebocytes, parasites and other ejecta found in the coelom.