New species of Bathydrilus Cook (Oligochaeta; Tubificidae) from British Columbia

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Abstract
B. litoreus sp. nov., from intertidal habits of British Columbia and Washington [USA], is distinguished from other members of the genus by possessing histologically bipartite atria, atrial ducts, bilobed glandular sacs about the penial setae, patches of glandular epithelium between the dorsal setal bundles and thickened ventral epidermal pads. B. torosus sp. nov., from the intertidal zone of southwest Vancouver Island; is the only known shallow-water species of Bathydrilus to lack modified penial setae; it lacks dorsal patches of glandular epithelium and thickened ventral epidermal pads but does possess atrial ducts and histologically bipartite, muscular atria. B. litoreus and B. torosus lack copulatory sacs and pseudopenes. These are the 1st spp. of the genus to be described from the northeast Pacific.