. The Canadian field-naturalist. 1985 Te and Clarke: Physella (Physella) wrighti 297. Figure 1. Physella (Physella) wrighti, new species. A, B, D, and E are SEM photographs of the holotype (B) and paratypes. C is of living specimen. Shell lengths are: A, mm; B, ; C, unmeasured; D, ; and E, Porsild and Crum (1959) which should be consulted for information about the physiography and botany of Liard Hot Springs. ECOLOGY; The whole population of Physella wrighti wasfound in Alpha Stream, the warm outlet of Alpha Pool, in an area beginning just below the mouth of a cool tributary. Fe
. The Canadian field-naturalist. 1985 Te and Clarke: Physella (Physella) wrighti 297. Figure 1. Physella (Physella) wrighti, new species. A, B, D, and E are SEM photographs of the holotype (B) and paratypes. C is of living specimen. Shell lengths are: A, mm; B, ; C, unmeasured; D, ; and E, Porsild and Crum (1959) which should be consulted for information about the physiography and botany of Liard Hot Springs. ECOLOGY; The whole population of Physella wrighti wasfound in Alpha Stream, the warm outlet of Alpha Pool, in an area beginning just below the mouth of a cool tributary. Fern Creek, and extending down- stream for 34 m. On 20 July 1979 the water in Alpha Pool was at 40° C, the water in Fern Creek was at 19°C, and the mixed water below the mouth of Fern Creek was at 23° C. Farther down-stream in other parts of Alpha Stream inhabited by P. wrighti water temperatures ranged up to 35°C. The snails occurred only on Chara plants at depths of to m and no other species of mollusks were present. All of the shells of P. wrighti were densely covered with diatoms. The dominant species were tentatively identified, from SEM photographs, as Cocconeispla- centula Ehrenberg and Eunotapectinalis (Dillworth) Rabenhorst var. minor (Kutzing) Rabenhorst. Analysis of Alpha Stream water from just below the mouth of Fern Creek gave the following results: pH, ; alkalinity (mg/L CaCOj), 155; hardness (as mg/L CaCOj), 660; suspended solids (mg/L), < ; dissolved solids (mg/L), 1100; conductivity, (/imhos/ cm), 1310; dissolved Ca (mg/L), 210; and dissolved SO4, (mg/L) 330. DISCUSSION: AUhough the shell characters and ana- tomical features of P. wrighti show greater concor- dance with those typical of the genus Physella (Halde- man, 1842), subgenus Physella, than with any other subgenus and the species is therefore considered a Physella (s. str.), P. wrighti has features which indi- cate a relationship with other subgenera as well. For example, in the subg
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