Marine isopods collected in the Philippines by the fisheries steamer Albatross in 1907-08 . a. b. c. FIG. 1.—HOLOPHRYXUS GIARDI. ADULT FEMALE, a. DOR sal view. b. Lateral view. c. Ventral view. x2|. ..1686 NEW ISOPODS FROM THE PACIFIC OCEAN—RICHARDSON. 69 L The head is large and is surrounded anteriorly and laterally by awide marginal border or ridge. There are no eyes. The three divi-sions of the body—the head, thorax, and abdomen—are well segments of the thorax are also well marked, the coxal platesoccupying the lateral margins. There are six distinct segments, withsix pairs
Marine isopods collected in the Philippines by the fisheries steamer Albatross in 1907-08 . a. b. c. FIG. 1.—HOLOPHRYXUS GIARDI. ADULT FEMALE, a. DOR sal view. b. Lateral view. c. Ventral view. x2|. ..1686 NEW ISOPODS FROM THE PACIFIC OCEAN—RICHARDSON. 69 L The head is large and is surrounded anteriorly and laterally by awide marginal border or ridge. There are no eyes. The three divi-sions of the body—the head, thorax, and abdomen—are well segments of the thorax are also well marked, the coxal platesoccupying the lateral margins. There are six distinct segments, withsix pairs of coxal plates. The first segment is coalesced with thehead. The first coalesced segment bears the first pair of legs. Thefollowing five segments bear each a pair of legs, so that altogetherthere are six pairs of legs. The last free (sixth) segment bears apair of modified The abdomen is narrower than the thorax, and tapers to a roundedextremity. It is unsegmented and is devoid of Fig. 2.—Holophryxus giardi. Immature female and host. Only one immature female was taken at Station 4793, ToporkovIsland, Harbor of Nikolski, Bering Island, north 58° east, 44 miles(54° 48 north, 164° 54 east), at a depth of 2,700 fathoms. It wasattached to the dorsal surface of the carapace of the host, Gennadasborealis Rathbun, with the head directed posteriorly. The photo-graph (fig. 2) is of the immature female and its host. a They may be analogous to or homologous with the fifth pair of appendagesof Heterophryxus appendiculatas Sars. (Challenger Report, XIII, 1885, Pt. 37,pp. 220-221, pi. xxxviii,, figs. 8-14.) See Tattersall for description and figuresof this form. (Fisheries, Ireland, Sci. Invest., 1904, II, 1905, pp. 77-78, pi. xi,figs. 1-4.) Or, this segment may be considered the first abdominal segment withits appendages. 692 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIII. The adult female is about four and a half times longer than theimmature female.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
