. The Canadian field-naturalist. 1983 Notes 225 A River Otter, Lutra c. canadensis, of Record Size James D. Lazell, jr. The Conservation Agency, 8 Swinburne St., Jamestown, Rhode Island 02835 Lazell, James D., Jr. 1983. A River Otter, Lutra c. canadensis, of record size. Canadian Field-Naturalist 97(2); 225-226. A male otter, Lutra c. canadensis {MammaVia: Mustelidae), from Lynnfield, Essex Co., Massachusetts, measures 1321, 470, 129, 21, and is thus at least a percent larger than various published maxima for this form. The baculum is 102, the maxillary row and the carnassial 12 by 10 mm.
. The Canadian field-naturalist. 1983 Notes 225 A River Otter, Lutra c. canadensis, of Record Size James D. Lazell, jr. The Conservation Agency, 8 Swinburne St., Jamestown, Rhode Island 02835 Lazell, James D., Jr. 1983. A River Otter, Lutra c. canadensis, of record size. Canadian Field-Naturalist 97(2); 225-226. A male otter, Lutra c. canadensis {MammaVia: Mustelidae), from Lynnfield, Essex Co., Massachusetts, measures 1321, 470, 129, 21, and is thus at least a percent larger than various published maxima for this form. The baculum is 102, the maxillary row and the carnassial 12 by 10 mm. The specimen is Yale Peabody Museum (YPM) 4405. Key Words: River Otter Lutra c. canadensis, size, dentition, baculum. On 17 April 1977 I collected a road-killed, male River Otter on Route 128 just west of exit 31, just within the western limit of both the town of Lynnfield and Essex County, Massachusetts. The specimen was fresh and skinned immediately. The skull was badly broken and therefore the measurement I give (Table 1) for total length is probably unduly precise; the total length is about 132 cm or approximately 52 inches (4 feet 4 inches). The animal was not weighed but was judged at least 10 kg. The prepared skin is shown in Figure 1. I follow Hoffmann (1976) in use of the generic name Lutra. Table 1. Maximum sizes for Lutra c. canadensis in the literature and measurements of YPM 4405 in millimeters. Source Total Tail Hind Foot Hamilton (1943) 1100 400 100 Bailey (1946) 1045 330 105 Jackson (1961) 1220 475 133 Peterson (1966) 1300 500 140 Doutt et al. (1977) 1200 440 132 YPM 4405 1321 470 129 In popular literature some very large sizes are given for otters in general. For example, Trimm (1977) claims individuals "measuring up to 55 inches in length and weighing up to 30 ; Although he is, by implication, writing about North American River Otters, he cites no source and does not imply that he means the eastern form, Lutra c. canadensis. Maximum size data
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