. Bulletin - United States National Museum. Science. THE SPIDER CBABS OF AMERICA 79 Chelipeds longer than the legs, the merus, carpus and upper margin of manus tuberculate. Fingers in adult male two-thirds to three- fourths as long as upper margin of palm, gaping in basal half, deflexed, lower margin of propodal finger convex; dactylus with a large tooth in the gape, fixed finger with a smaller tooth nearer the palm. In the ambulatory legs the carpus and dactylus are more than half as long as the propodus. Color.—Tan or gray, with dots and small markings of red; color, however, can not be seen
. Bulletin - United States National Museum. Science. THE SPIDER CBABS OF AMERICA 79 Chelipeds longer than the legs, the merus, carpus and upper margin of manus tuberculate. Fingers in adult male two-thirds to three- fourths as long as upper margin of palm, gaping in basal half, deflexed, lower margin of propodal finger convex; dactylus with a large tooth in the gape, fixed finger with a smaller tooth nearer the palm. In the ambulatory legs the carpus and dactylus are more than half as long as the propodus. Color.—Tan or gray, with dots and small markings of red; color, however, can not be seen until decorative material is removed. (Way.) Measurements.—Male (48833), length of carapace with rostrum , length of rostrum 19, width of carapace 39 mm. Range.—From Bering Sea (Nunivak Island and Commander Islands) to Monterey Bay, California, and Honshu Island, Japan. Shallow water to 212 fathoms. Material examined.—See table, pages 72-78. OREGONIA BIFURCA Rathbnn Plates 26 -28 Oregonia bifurca Rathbun, Proc. U. S. Nat. Mus., vol. 24, 1902, p. 885 (type-locality, North of Rat Island, Aleutians, 270 fathoms, station 3785; holotype, Cat. No. 25287, U. S. N. M.); Harriman Alaska Exped., vol. 10, 1904, p. 171, pi. 6, fig. 5. Diagnosis.—Rostral horns short, divergent. Supra-orbital arch not prominent nor angled posteriorly. Body sub-oblong. DescHption.—Body and appendages covered with soft downy hairs. Carapace wider ante- riorly than in 0. gracilis, the width at base of postorbital spines about two-thirds of the branchial width. Tuberculation finer than in gracilis. Rostrum short, flat, horns divergent from their base, gradually tapering, acuminate. Postorbital spines similar in shape to the rostral horns, but shorter; they are directed more for- ward than in gracilis. Basal article of antenna with spinulous outer and inner margins and a stout antero-external spine. Lower margins of arm furnished with stout spines, upper margin with much smaller spines. On the in
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