. Bulletin. Science; Natural history; Natural history. 1974 PACIFIC ( 0AS1 I mm a in 'i. Figure 5. Limnodriloides barnardi, n. sp. A, Longitudinal view of genital segments: B, Spermathecal seta; C, Somatic seta. 1, sperm bundle; 2, spermathecal ampulla; 3, vacuolated muscular sac surrounding spermathecal seta; 4, protractor muscles of spermathecal seta; 5, male funnel: 6, vas deferens; 7, prostate gland; 8, penial sac; 9, atrial ampulla: 10. glandular part of atrial duct. diameter, and a truncated-cone-shaped penis, through which penetrates the terminal part of the atrial duct; the latter open
. Bulletin. Science; Natural history; Natural history. 1974 PACIFIC ( 0AS1 I mm a in 'i. Figure 5. Limnodriloides barnardi, n. sp. A, Longitudinal view of genital segments: B, Spermathecal seta; C, Somatic seta. 1, sperm bundle; 2, spermathecal ampulla; 3, vacuolated muscular sac surrounding spermathecal seta; 4, protractor muscles of spermathecal seta; 5, male funnel: 6, vas deferens; 7, prostate gland; 8, penial sac; 9, atrial ampulla: 10. glandular part of atrial duct. diameter, and a truncated-cone-shaped penis, through which penetrates the terminal part of the atrial duct; the latter opens on the penis subterminally and laterally. Paired spermathecae with discrete ducts 40 to 55 n long, 30 to 35 n maximum diameter, and elongate ampullae 200 to 220 ^ long, 70 to 120 m maximum diameter; latter tend to be constricted in the middle third of their length. Sperm in the sperma- thecae oriented into long narrow bundles, 95 to 135 ti. long. Remarks.—Morphologically, L. barnardi is very closely related to L. winckelmanni. Their atria and atrial ducts with glandular lining cells are, on available evidence, indistinguishable, and their spermathecal setae contained within vacuolated sacs are unique in the genus; the number and form of their setae are also similar. A com- parison of the information available on L. winckel- manni, which is apparently derived from the type specimens alone (Michaelsen, 1914; Boldt, 1928; Hrabe. 1967; 1971b) with the description of L. barnardi, reveals that their intromittent organs differ (vide infra) and that the general dimen- sions of L. barnardi are smaller than those of L. winckelmanni (maximum body length, clitellum diameter and setal length of the two species are, respectively, 10 and IS mm, and mm, 60 and 90 p). The dimensions are probably not im- portant characters as wide intra-specific variation in size is well known for many common tubificids and lumbriculids, but the different structures of their intromittent organs is mo
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