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Paramyosin-containing invertebrate muscles display several types of filamentous organization. Very thick (500-700 A in diameter) filaments in smooth "catch muscles" have a 145 A periodicity with a 725,k repeat (Lowy et al ., 1964) . The thick filaments of obliquely striated muscles containing paramyosin range from 200 A to 500 A in diameter but do not exhibit paramyosin periodicity (Hanson and Lowy, 1961), nor do the ordinary thick filaments of cross striated invertebrate muscle from which paramyosin has been extracted, including Limulus skeletal muscle (Levine et al., 1972) . However, in the course of our ultrastructural study of both glycerinated and freshly-fixed Limulus telson muscles (Dewey, Levine and Colflesh, unpublished observations), we occasionally observed unusually thick, striated filaments or filament aggregates . In this report we describe these structures and discuss the nature of their periodicity .

UNUSUAL STRIATED THICK FILAMENTS IN LIMULUS SKELETAL MUSCLE