(Fig. 43H–K)
Eupagurus (Trigonochirus) dalli Benendict, 1892: 9.
Pagurus (Trigonocheirus) Dalli. — Holmes 1900: 139.
Pagurus dalli. — Rathbun 1904: 158, pl. 4, fig. 1. — McLaughlin 1974; 280, figs. 72, 73 (extensive synonymy). — Hart 1982: 160, fig. 62. — Ricketts et al. 1985: 300.
Diagnosis (after McLaughlin 1974). Rostrum usually slightly longer than lateral projections of carapace, triangular, ending in small acute spine, usually with terminal tuft of short setae. Eyestalk moderately short, stout; reaching middle of third segment of antennular peduncle. Ocular scale subovate. Major cheliped elongate, ventromesial margin of merus without strong spinose protuberance; dorsal, lateral surfaces set with sharp teeth. Minor cheliped much smaller than major cheliped, with dorsal surface convex, midline elevated, bearing single row of strong spines. Pereopods 2, 3 nearly equal in size, their segments flat, dactyl equal in size to or slightly exceedinglength of propodus. Telson asymmetrical, lateral margins rounded, terminal margins strongly spinose. Carapace length to 11.9 mm.
Color in life. Overall brown with opaque white bands on distal part of the meri of pereopods 1–3. Hart (1982) gave a detailed description of the color pattern.
Habitat and depth. Gravel, sand or mud, intertidal zone to 276 m (Hart 1982).
Range. Bering Sea to Oregon. Type locality Bristol Bay, Alaska (Albatross sta. 3233).
Remarks. Ricketts et al. (1985) noted that this hermit crab often lives within holes in the sponge Suberites ficus (Johnston, 1842).