Les isopodes marins recueillis aux Philippines par l'U.S pêches steamer Albatross en 1907-1908 . long. 164° 54 E.). La profondeur.-deux mille sept cents toises. Parasite sur Gennadas borealis Rathbun. HOLOPHRYXUS CALIFORNIENSIS Richardson. Holophryxus californiensis Richardson, Proc. U. S. Nat. Mus., 33, 1908,pp. 692-694. Localité.-Sur le chemin de la baie de Seattle, oui au point Bushby.Profondeur.-cent cinquante à deux cent quatre-vingt brasses.Pasiphcea paciflca Kathbun sur parasitaire. Genre ARTHROPHRYXUS Richardson. ARTHROPHRYXUS BERINGANUS Richardson. Arthrophryxus beringanus Richardson, Pr

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Marine isopods collected in the Philippines by the U.S fisheries steamer Albatross in 1907-08 . long. 164° 54 E.). Depth.—Two thousand seven hundred fathoms. Parasitic on Gennadas borealis Rathbun. HOLOPHRYXUS CALIFORNIENSIS Richardson. Holophryxus californiensis Richardson, Proc. U. S. Nat. Mus., vol. 33, 1908, pp. 692-694. Locality.—On the way from Yes Bay to Seattle, at Bushby Point.Depth.—One hundred and fifty to two hundred and eighty fathoms.Parasitic on Pasiphcea paciflca Kathbun. Genus ARTHROPHRYXUS Richardson. ARTHROPHRYXUS BERINGANUS Richardson. Arthrophryxus beringanus Richardson, Proc. TJ. S. Nat. Mus., vol. 33, 1908, pp. 695-696. Locality.—One female, with Schizopoda but not attached, fromstation 4760, on the way from Union Bay, British Columbia, toDutch Harbor, Alaska, by the Goletas Channel and Unalga Pass, atlat. 53° 53 N.; long. 144° 53 W. Depth.—Two thousand two hundred fathoms. The type-specimen came from station 4793, on the way fromNikolski Bay, Bering Island, Komandorski Islands, to Petropaulovsk, 124 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 37.. Fig. 47.—Prophryxus ala-scensis. Dorsal view OF ADULT FEMALE. X 19g. Avatcha Bay, Kamchatka, at Toporkov Island, harbor of Nikolski, Bering Island, at a depth of 2, 700 fathoms; it was parasitic on Eucopia australis. PROPHRYXUS, new genus. Body of adult female irregular in outline. Head and first threesegments of thorax defined. Last four thoracic segments indicated only in the dorsal region. Lateral parts ofthorax swollen and extending backward in asmall rounded lobe on either side. Five abdominal segments defined. Pleo-pods rudimentary. Five pairs of legs surround the oral area.Male unknown. Type of genus.—Prophryxus alascensis. PROPHRYXUS ALASCENSIS, new species Body of adult female oval in outline, withthe front somewhat quadrangular, more orless depressed. Lateral parts of body swollen, but not projecting anteriorly. Head extend-ing straight in front, with the anterior mar-gin straight

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