. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). 126 THE PUE SEALS OF THE PRIBILOP ISLANDS. Fig. 28. °"" from the tip, which is rounded and bears a small styliform process embedded in the cuticle; vulva three-sevenths of the length from anterior extremity. The ova (fig. 28) are spherical, 52 pi in diameter, with roundish elevations. Von Linstow does not believe that Dujardin's (1845) ^^Ascaris simplex ; (see A. Bussumierii) is identical with the species he studied. Monticelli (1889, pp. 69, 70) records A, simplex from the stomac
. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). 126 THE PUE SEALS OF THE PRIBILOP ISLANDS. Fig. 28. °"" from the tip, which is rounded and bears a small styliform process embedded in the cuticle; vulva three-sevenths of the length from anterior extremity. The ova (fig. 28) are spherical, 52 pi in diameter, with roundish elevations. Von Linstow does not believe that Dujardin's (1845) ^^Ascaris simplex ; (see A. Bussumierii) is identical with the species he studied. Monticelli (1889, pp. 69, 70) records A, simplex from the stomach of '^DelpMnus sp., of Porto La gunas (canali Patagonici)," taken by baptain Chierchia in the voyage of the royal corvetta Vettor Pisani. His determi- nation was made by comparing the specimens with the worms (N. 529,829) at the Vienna Museum determined by Diesing. It will thus be seen that this record depends entirely upon a determination made before Krabbe definitely defined Ascaris simplex, and on this account calls for confirmation. Braun (1891, p. 110) and Jagerskiold (1891) are not accessible to us at present. Jagerskiold (1894, pp. 474^476) examined specimens of A. simplex from Beluga leueas [=I>elp}iinapterus leucas), which he had obtained from Levinsen; he found the bursa as well developed in these as in ^. angulivalvis Greplin from Balaenoptera rostrata, and no longer doubts the identity of the two forms. He describes the oesophagus (fig. 29) as com- posed of two portions, an anterior longer portion, which increases gradually in diameter, and a second shorter portion, which begins with a swelling and then gradually decreases in size; no caeca are present. The intestine'is provided with several rows of groups of elongate cells, each group having a V shape, the apex directed caudad. The excretory organ is about one-third as long as the animal. The vulva was 36â¢" from the anterior end in a specimen 72â¢â¢ long, and 70'"⢠from the anterior e
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashingtongovtprin
