. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 412 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY b. Apex subacute, distinctly eccentric, to the right of the midline. Penis with a long glandular flagelhuu terminating in a bulbous tip; preputium without pigment. Tentacles colorless. In canals, etc., in southern Florida, and perhaps west to Texas Hehetancylus Genus ACROLOXUS Beck, 1837 Type species. Patella lacustris Linnaeus, 1758 AcROLoxus coLORADENsis (Heudersou) Ancylus hendcrsoni Walker, 1925, Occ. Pap. Mus. Zool. Univ. Mich. 1G5: 1, pi. I, figs. 1-2; pi. II, fig. 1.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 412 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY b. Apex subacute, distinctly eccentric, to the right of the midline. Penis with a long glandular flagelhuu terminating in a bulbous tip; preputium without pigment. Tentacles colorless. In canals, etc., in southern Florida, and perhaps west to Texas Hehetancylus Genus ACROLOXUS Beck, 1837 Type species. Patella lacustris Linnaeus, 1758 AcROLoxus coLORADENsis (Heudersou) Ancylus hendcrsoni Walker, 1925, Occ. Pap. Mus. Zool. Univ. Mich. 1G5: 1, pi. I, figs. 1-2; pi. II, fig. 1. Eldora Lake, Boulder County, Colorado; non Walker 1908. Ancylus coloradensis Henderson, 1939, Nautilus 44: 31. [New name for hendersoni Walker 192o, non 1908.] Acroloxus coloradensis (Henderson). Taylor, 19G0, U. S. Geol. Surv. Prof. Paper 337: 61. Description: "Shell oval, slightly wider anteriorly, very much depressed, light horn color; anterior and posterior margins reg- ularly rounded, lateral margins about equally curved, the right somewhat more than the left; anterior, posterior and right lat- eral slopes straight, left lateral slope slightly incurved; apex very acute, almost spine-like, eccentric, turned towards the left side, situated at about 2/5 of the length from the posterior mar- gin and at about 1/3 of tlie width from the left margin, radially striate, the striae continuing over the surface of the shell from the apex to the margins; surface with fine and regular lines of growth and delicately radially striate. Length 5, width 3, alt. 1 ; —Walker Types: UMMZ 102549 (H- Holotype) ; Univ. Colorado Mu- seum 10113. Distribution: The Eldora Lake locality (Colorado) is the only one known in the United States for this peculiar limpet, and to my knowledge it has been found there only once. Alan Mozley collected the species in two lakes in Alberta, Canada: Lake Iris in 1925, and "Lake north of Geikie Station" in 1926 (specimens at ANSP, 152666).. Fi
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