Two New Species of Plistophora (Microsporida,Nosematidae) in Decapods,with Particular Reference to One in the Blue Crab*

SYNOPSIS. Plistophora cargoi n. sp., found in the muscles of Callinectes sapidus Rathbun, is described. Spores are ellipsoidal and about 3.3 by 5.1 μ when alive. The coiled polar filament is PAS positive. When extruded the filament appears thick throughout most of its length but has a short and fine terminal portion. The sporont gives rise to many (32 to more than 100) spores. P. sp. Sogandares-Bernal, 1962, found in the muscles of the fresh water crayfish Cambarellus puer Hobbs, is given the name P. sogandaresi n. sp.