. Decapod crustaceans of the northwest coast of North America ... Crustacea -- North America. DECAPODS 73 Male.—As compared with the female, the teeth of the median carina and rostrum are much smaller and more appressed, sometimes obsoles- cent, the rostrum less deep and more horizontal; the antennular acicle does not reach the end of the second segment of the peduncle; the spine of the antennal scale falls short of the end of the blade. Dimensions. — $ , length (approximate) 38 mm., length of carapace and rostrum mm., of ros- trum 6 mm. Distribution.—Kxaic Alaska, Aleutian Islands
. Decapod crustaceans of the northwest coast of North America ... Crustacea -- North America. DECAPODS 73 Male.—As compared with the female, the teeth of the median carina and rostrum are much smaller and more appressed, sometimes obsoles- cent, the rostrum less deep and more horizontal; the antennular acicle does not reach the end of the second segment of the peduncle; the spine of the antennal scale falls short of the end of the blade. Dimensions. — $ , length (approximate) 38 mm., length of carapace and rostrum mm., of ros- trum 6 mm. Distribution.—Kxaic Alaska, Aleutian Islands s^il^IuJZ^is daiu to Sitka. .- A""- a. Side of carapace of $ . Although this species appears to be not rare ^- side of carapace of 9. in Alaska, it has been collected almost exclusively by Dr. Dall, who ob- tained it at 17 stations along the Aleutian Islands and eastward to Port Etches, 6-20 fathoms; off Cape Sabine, 13 fathoms; and 15 miles off Cape Krusenstern, 14 fathoms. Sitka, 2 specimens (Harriman Expedition, W. R. Coe, collector). SPIRONTOCARIS POLARIS (Sabine). Alpheus polaris Sabine, Supplement to Appendix of Parry's [First] Voyage, p. ccxxxviii, pi. II, figs. 5-8, 1824. Hippolite borealis James C. Ross, in John Ross, Appendix to Narrative of Second Voyage in Search of a North-West Passage, p. Ixxxiv, pi. B, fig. 3. 1835(5). Hippolite polaris James C. Ross, op. cit., p. Ixxxv ( $ ). Hippolyte St. Pauli BRANDT, Middendorff's Reise Sibir., Band II, Zool., Theil I, Krebse, p. 118, pi. v, fig. 19, 1851. Hippolyte ciiltellata Norman, Rept. Brit. Assoc. Adv. Sci., 1866, p. 200 (1867) (= H. polaris, teste Norman, Museum Normanianum, ili, Crus- tacea, p. 8, 1886). Hippolyte polaris Smith, Trans. Conn. Acad. Arts Sci., v, p. 80, pi. xi, figs. 1-4, 1879. Hippolyte Amazo Pfeffer, Jahrb. Hamburg. Wiss. Anst., ill, 46, plate, figs. 7a, 7b, 1886. HetairusgaijnardimxT'E., Challenger Rept., Zool., xxiv, 611, pi. Cix, fig. 2, 1888 (not Hippolyte gaimardii Milne Edward
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