. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 3. Types of gubernacula in Paracanthonchus. a—P. strandensis (after Schuiz, 1932); b—P. coecus (after Timm, 1952); c—P. cochlearis (after Gerloch, 1957); d—P. platypus n. sp. tioiial Collection of Nematodes, Entomology Research Institute, Ottawa, Collection Num- ber 4073, Type slide No. 76. Type locality, M-8, Biscayne Bay. Representation in samples studied.—M-8, Bisca>ne Bay. PARACYATHOLAIMUS Micoletzky, 1921 Type species.—Cyaf/io/a/mus dubiosus BUt- schli, 1874: 284, pi. 7, fig. 31, a, b. This genus is cha
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 3. Types of gubernacula in Paracanthonchus. a—P. strandensis (after Schuiz, 1932); b—P. coecus (after Timm, 1952); c—P. cochlearis (after Gerloch, 1957); d—P. platypus n. sp. tioiial Collection of Nematodes, Entomology Research Institute, Ottawa, Collection Num- ber 4073, Type slide No. 76. Type locality, M-8, Biscayne Bay. Representation in samples studied.—M-8, Bisca>ne Bay. PARACYATHOLAIMUS Micoletzky, 1921 Type species.—Cyaf/io/a/mus dubiosus BUt- schli, 1874: 284, pi. 7, fig. 31, a, b. This genus is characterized by the simple giibernaculum which is supposed to hardly expand distally, and in the diagnosis by Micoletzky (1924b) was described as being "ohne Dornen," and by the male supple- ments which Micoletzky called "Borsten- ; These supplements probably are not true setae l)ut represent ducts of the ParacanthoncJiiis-type with the lumina so narrow as to give the impression of setae. Gerlach (1955) described a species, P. paucipapilhitus, in which the gubernaculum expands distally to form a plate covered with rasp-like denticles. The supplements consist of strongly protruding conical papil- lae with cuticularized, narrow ducts. The first character links Gerlach's species to ParacantJioncliiis, the second character sets it apart from all other species of Paracan- tli())icliiis and ParacyalJiokiiuiiis with the exception, perhaps, of P. diii^itatus Gerlach, 1957, in which similar supplements have been described and the gubernaculum is also rather strongly dentate. Our material contained representatives of what at first we held to be P. paiicipapillatus. However, on closer examination we noted the follow- ing differences: 1) distal end of guber- naculum with distinct teeth, numbering from 4-8, rather than with a rasp-like field of denticles, 2) ducts of supplements more elaborate, and 3) buccal cavity with one large dorsal tooth and three
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