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To assess its biological distinctness, an isolate of Echinococcus multilocularis from Montana was compared with an isolate from Alaska in gerbils (Meriones unguiculatus) by means of intraperitoneal inoculations with protoscoleces. The cysts formed by the Montana isolate were entire, hyaline, and translucent, whereas those produced by the Alaska isolate were granular, yellowish, and opaque. Vesicles of the Montana isolate were larger, produced protoscoleces more slowly but in greater numbers, and required a longer period to develop surfacial germ cell protrusions, which were of smaller size. Also delayed was invasion of the laminate layer by granulocytes and macrophages, and a longer time was required for the appearance of pulmonary metastases. The 2 isolates differed also in characteristics of rostellar hooks, those from the Montana isolate being fewer and larger, often with accessory hooks.

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An intestinal trematode of shrews previously identified as Opisthioglyphe locellus Kossack, 1910, by Macy & Moore (1958) in Oregon is identified as Neoglyphe soricis (= Opisthioglyphe soricis) originally described from Sorex araneus L., in Poland by Pojmańska (1956). N. soricis found in Sorex cinereus, near Anchorage, Alaska, is a new host and new locality record. N. soricis, the only species of Neoglyphe known from North America, is compared with its Eurasian counterpart and closely related species. Evidence supporting the retention of the genus Neoglyphe originally proposed as a subgenus by Shaldybin (1953), and raised to generic rank by Yamaguti (1958), and invalidated by Zarnowski (1960), is presented.